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CRLCharles River Laboratories

Health care · Research Services · NYSE

We began operating in 1947 and, since then, have undergone several changes to our business structure. 10-K, Item 1

Employees
19,700
Headquarters
Wilmington, MA
CEO
Birgit Girshick
Next results
around Jan 12, 2027
Compare with peers → Embed

What CRL's management wrote with each quarter's results: the press release (8-K item 2.02, exhibit 99) and, when the company files them, its prepared remarks or the call transcript. The call itself is not filed with SEC, so most quarters have the release only.

Adjusted vs GAAP earnings per share

in the company's own words

In its release of 2026-11-04, CRL reported $6.86 per share under GAAP and $3.09 on its own adjusted basis: the adjusted number is -55% below GAAP.

The company's words, latest release
Reports third-quarter revenue of $982.7 million, GAAP earnings per share of $6.86, and non-GAAP earnings per share of $3.09. release

Both numbers are read from the words of each release (usually the highlights), never computed by us; hover a number for its sentence. Quarters where the release gives them only in a table are not shown. The company decides what "adjusted" leaves out; the full reconciliation is in the release.

Press release Nov 4, 2026 · EX-99.1

Charles River Laboratories Announces Third-Quarter 2026 Results

Open on SEC ↗

– Charles River Laboratories International, Inc. (NYSE: CRL) today reported its results for the third quarter ended September 26, 2026.

• Reports third-quarter revenue of $982.7 million, GAAP earnings per share of $6.86, and non-GAAP earnings per share of $3.09.

• Organic revenue growth of 4.7%, outperforming the Company's prior outlook and representing a return to organic revenue growth for the second consecutive quarter.

• Operating margin increased year-over-year, with non-GAAP operating margin increasing 330 basis points to 23.0% and GAAP operating margin increasing 730 basis points to 20.6%.

• Organic revenue guidance increasing by 100 basis points and non-GAAP earnings per share guidance increasing by $0.15 at midpoint.

• Guidance increases primarily driven by third-quarter outperformance, led by a better-than-expected performance in the DSA segment and a lower tax rate.

• Charles River unveiled its Pathway to Purpose strategic vision and Create the Future TM initiative at its 2026 Investor Day, outlining initiatives designed to enhance operational excellence, strengthen scientific leadership, and drive long-term value creation.

• The Company advanced modernization efforts through the implementation of its Endosafe ® Cartridge Technology Automated Manufacturing Suite, which utilizes a fully automated production suite to increase production capacity and strengthen manufacturing controls and digital traceability. In addition, the Company partnered with Autolomous to launch Apollo Orchestrate TM , a new capability within Charles River's Apollo ® platform to digitize and transform laboratory workflows, increase efficiency, and provide greater transparency and connectivity with clients.

• Charles River has also taken steps to continue to strengthen its scientific capabilities. It recently announced an industry collaboration with the U.S. Food and Drug Administration (FDA) to validate preclinical screening tools to quantify and rank the abuse potential of new drugs.

• To further advance its Alternative Methods Advancement Project TM (AMAP TM ) initiative, the Company introduced a new, rapid cell banking program designed to significantly accelerate product release timelines in its Biologics Testing Solutions business by incorporating in vitro next-generation sequencing capabilities into the cell bank production process. In addition, its Virtual Control Group (VCG) database and methodology will be 1

used in an upcoming Good Laboratory Practice (GLP)-compliant safety assessment study for Ipsen.

Revenue was $982.7 million, a decrease of 2.2% from $1,004.9 million in the third quarter of 2025, primarily driven by the impact of the May 2026 divestitures. On an organic basis, revenue increased 4.7%, driven by revenue growth in the Manufacturing Solutions (Manufacturing) and Discovery and Safety Assessment (DSA) segments. Organic revenue growth excludes the effect of acquisitions, divestitures, and foreign currency translation.

In the third quarter of 2026, the GAAP operating margin was 20.6%, compared to 13.3% in the third quarter of 2025, driven primarily by a benefit of $44.6 million in the DSA segment from the reversal of acquired non-income tax reserves following newly enacted tax legislation and completion of certain tax requirements in a foreign jurisdiction. The GAAP net income available to common shareholders for the third quarter of 2026 was $333.1 million, or $6.86 per diluted share, compared to GAAP net income of $54.4 million, or $1.10 per diluted share for the same period in 2025. The GAAP net income and earnings per share increases included a benefit totaling $245.6 million, or $5.06 per share, associated with the reversal of acquired tax reserves following newly enacted tax legislation and completion of certain tax requirements in a foreign jurisdiction.

On a non-GAAP basis, the third-quarter operating margin increased to 23.0% from 19.7% in the third quarter of 2025, primarily as a result of the benefit of the CDMO divestiture and operating leverage from higher sales volume for safety assessment services. Non-GAAP net income was $150.1 million for the third quarter of 2026, an increase of 24.8% from $120.3 million for the same period in 2025. Third-quarter diluted earnings per share on a non-GAAP basis were $3.09, an increase of 27.2% from $2.43 per share in the third quarter of 2025. The non- GAAP net income and earnings per share increases were driven primarily by the higher operating margin and a lower tax rate.

Birgit Girshick, Chief Executive Officer, said, “In the third quarter, we were encouraged by the continued strength of the biopharmaceutical demand environment and that was reflected in our financial results. Revenue and earnings per share outperformed our prior expectations, DSA net bookings and proposals continued to show robust, year-over-year increases, and we continued to make meaningful progress towards our strategy and long-term financial targets. We see significant opportunities to continue to strengthen Charles River’s position as a leading scientific partner for regulated testing across the drug development continuum. Through our Pathway to Purpose strategy, we are building a more agile, client-centric organization that will deepen client relationships, expand engagement across our portfolio, and increase our share of R&D spend as demand trends continue to improve."

Revenue for the DSA segment was $596.3 million in the third quarter of 2026, a decrease of 0.7% from $600.7 million in the third quarter of 2025, primarily driven by the divestiture of 2

certain European Discovery Services sites. Organic revenue increased by 5.9%, driven primarily by higher study volume for regulated safety assessment services.

In the third quarter of 2026, the DSA segment’s GAAP operating margin increased to 28.9% from 20.5% in the third quarter of 2025. The increase was primarily driven by the reversal of acquired non-income tax reserves. On a non-GAAP basis, the operating margin increased to 26.8% from 25.4% in the third quarter of 2025. The non-GAAP operating margin increase was primarily driven by operating leverage from higher study volume for regulated safety assessment services, as well as lower sourcing costs for large research models.

Revenue for the Manufacturing segment was $178.9 million in the third quarter of 2026, a decrease of 6.2% from $190.7 million in the third quarter of 2025, primarily driven by the CDMO divestiture. Organic revenue increased 7.4%, driven by strong demand in both the Biologics Testing Solutions and Microbial Solutions businesses.

The Manufacturing segment’s GAAP operating margin was 35.7%, compared to 20.9% in the third quarter of 2025. On a non-GAAP basis, the operating margin increased to 38.6% from 26.7% in the third quarter of 2025. The GAAP and non- GAAP increases were driven primarily by the benefit of the CDMO divestiture.

Revenue for the RMS segment was $207.5 million in the third quarter of 2026, a decrease of 2.8% from $213.5 million in the third quarter of 2025, primarily driven by the Cell Solutions divestiture. Organic revenue decreased by 0.6%, due primarily to lower revenue for small research models in North America and for large research models. The decline was partially offset by higher revenue for small research models in China and for research model services, particularly the Insourcing Solutions business.

In the third quarter of 2026, the RMS segment’s GAAP operating margin increased to 19.9% from 16.2% in the third quarter of 2025, primarily due to lower costs related to the Cell Solutions divestiture and restructuring initiatives. On a non-GAAP basis, the operating margin decreased to 24.4% from 25.0%. The non-GAAP operating margin decrease was primarily driven by the impact of an unfavorable revenue mix, both geographically and related to large research models.

The Company is increasing its 2026 revenue and earnings per share guidance, which was last updated on August 5, 2026. This increase primarily reflects the third-quarter outperformance, which was principally driven by the better-than- expected performance in the DSA segment and a lower tax rate. On a GAAP basis, the Company is also increasing its earnings per share guidance, due primarily to the third-quarter benefit associated with the reversal of acquired tax reserves. 3

2026 GUIDANCE CURRENT PRIOR Revenue growth/(decrease), reported (2.0)% - (1.5)% (3.5)% - (2.5)% Less: Contribution from acquisitions 0.0% - (0.5)% 0.0% - (0.5)% Add: Impact from divestitures ~4.5% ~4.5% Less: Favorable impact of foreign (0.5)% - (1.0)% (0.5)% - (1.0)% exchange Revenue growth/(decrease), organic (1) At least +1.5% 0.0% - 1.0% GAAP EPS estimate $8.15 – $8.35 $3.05 – $3.35 Acquisition-related amortization (2) ~$2.10 ~$2.30 Acquisition- and divestiture-related ~$4.70 ~$4.75 costs (3) Reversal of acquired tax reserves (4) -$5.03 -- Costs associated with restructuring and ~$1.50 ~$1.20 efficiency initiatives (5) Other, net (6) -$0.03 -$0.17 Non-GAAP EPS estimate $11.35 – $11.55 $11.15 – $11.45

(1) Organic revenue growth is defined as reported revenue growth adjusted for completed acquisitions and divestitures (including the CDMO and Cell Solutions businesses, as well as certain European Discovery Services sites), as well as foreign currency translation.

(2) These adjustments primarily include amortization related to intangible assets, as well as the purchase accounting step-up on inventory and certain long-term biological assets.

(3) These adjustments include costs related to the evaluation and integration of acquisitions and divestitures, as well as a net loss on divestitures and other transaction-related tax adjustments.

(4) This adjustment is related to the third-quarter benefit associated with the reversal of acquired tax reserves following newly enacted tax legislation and completion of certain tax requirements in a foreign jurisdiction.

(5) These adjustments primarily include site consolidation (including site transition costs), severance, impairment, third-party consulting and professional services, and other costs related to the Company’s restructuring actions and efficiency initiatives. These adjustments also include gains and/or losses on the sale of certain assets and real estate.

(6) These adjustments primarily include: (i) certain venture capital and other strategic investment losses/(gains), net. This item only includes recognized gains or losses on certain investments. The Company does not forecast the future performance of these investments; and (ii) reductions to a previous $27 million inventory charge associated with a non-human primate (NHP) supply matter. As a result of the resolution of the U.S. government investigations during fiscal year 2025, certain NHPs were subsequently utilized.

Charles River has scheduled a live webcast on Wednesday, November 4, 2026, at 9:00 a.m. ET to discuss matters relating to this press release. To participate, please go to ir.criver.com and select the webcast link. You can also find the associated slide presentation and reconciliations of GAAP financial measures to non-GAAP financial measures on the website. 4

The Company reports non-GAAP results in this press release, which exclude often- one-time charges and other items that are outside of normal operations. A reconciliation of GAAP to non-GAAP results is provided in the schedules at the end of this press release.

This press release contains non-GAAP financial measures, such as non-GAAP earnings per share, non-GAAP operating income, non-GAAP operating margin, and non-GAAP net income. Non-GAAP financial measures exclude, but are not limited to, the amortization of intangible assets and the purchase accounting step-up adjustment on inventory and certain long term biological assets, and other charges and adjustments related to our acquisitions and divestitures, including expenses associated with evaluating and integrating acquisitions and divestitures, including advisory fees, certain transition costs, and certain other transaction-related costs, as well as fair value adjustments associated with contingent consideration; charges, gains, and losses attributable to businesses or properties we plan to close, consolidate, or divest, including the divestitures of our CDMO and Cell Solutions businesses, the sale of certain of our European Discovery Services sites, and the sale of certain assets including real estate; severance and other costs associated with our restructuring initiatives; investment gains or losses associated with our venture capital and certain other strategic equity investments; certain legal costs and adjustments related to an NHP inventory charge in our DSA segment related to now concluded U.S. government investigations into the NHP supply chain; legal and advisory costs related to entering into a Cooperation Agreement with a shareholder; tax effect of all of the aforementioned matters; and adjustments related to the derecognition of certain deferred tax assets due to the CDMO Gene Therapy intangible asset impairment charge, the recognition of deferred tax assets expected to be utilized as a result of changes to the Company's international financing structure, the revaluation of deferred tax liabilities as a result of foreign tax legislation, and the tax benefit recognized as a result of the changes in tax law enacted in a foreign jurisdiction. This press release also refers to our revenue on both a GAAP and non-GAAP basis: on a non-GAAP basis, we define “organic revenue growth” as reported revenue growth adjusted for foreign currency translation, acquisitions, and divestitures. We exclude these items from the non-GAAP financial measures because they are outside our normal operations. There are limitations in using non-GAAP financial measures, as they are not presented in accordance with generally accepted accounting principles, and may be different than non-GAAP financial measures used by other companies. In particular, we believe that the inclusion of supplementary non-GAAP financial measures in this press release helps investors to gain a meaningful understanding of our core operating results and future prospects without the effect of these often-one-time charges, and is consistent with how management measures and forecasts the Company's performance, especially when comparing such results to prior periods or forecasts. We believe that the financial impact of our acquisitions and divestitures (and in certain cases, the evaluation of such acquisitions and divestitures, whether or not ultimately consummated) is often large relative to our overall financial performance, which can adversely affect the comparability of our results on a period-to-period basis. In addition, certain activities and their underlying associated costs, such as business acquisitions, generally occur periodically but on an unpredictable basis. We calculate non-GAAP integration costs to include third-party integration costs incurred post-acquisition. 5

Presenting revenue on an organic basis allows investors to measure our revenue growth exclusive of acquisitions, divestitures, and foreign currency exchange fluctuations more clearly. Non-GAAP results also allow investors to compare the Company’s operations against the financial results of other companies in the industry who similarly provide non-GAAP results. The non-GAAP financial measures included in this press release are not meant to be considered superior to or a substitute for results of operations presented in accordance with GAAP. The Company intends to continue to assess the potential value of reporting non-GAAP results consistent with applicable rules and regulations. Reconciliations of the non-GAAP financial measures used in this press release to the most directly comparable GAAP financial measures are set forth in this press release, and can also be found on the Company’s website at ir.criver.com.

This press release includes forward-looking statements within the meaning of the federal securities laws. Forward-looking statements may be identified by the use of words such as “anticipate,” “believe,” “expect,” “intend,” “will,” “would,” “may,” “estimate,” “plan,” “outlook,” and “project,” and other similar expressions that predict or indicate future events or trends or that are not statements of historical matters. These statements also include statements regarding: the projected and/or anticipated future financial performance of Charles River and our specific businesses, including as delineated in our forward-looking guidance, and particularly our expectations with respect to revenue, the impact of foreign exchange, interest rates, and enhanced efficiency initiatives, including our Create the Future initiative; our expectations with respect to our ability to gain market share; our ability to create long-term value for our shareholders and successfully execute on our strategic initiatives, including our Pathway to Purpose strategic vision, and the impact and results of such initiatives; the Company’s plans or prospects, expectations and long-term goals associated with our business; earnings per share; operating margin; client demand, particularly the future demand for drug discovery and development products and services, including our expectations for future revenue trends; our expectations with respect to booking trends and the impacts thereof; our expectations with respect to pricing of our products and services; our expectations with respect to future tax rates and the impact of such tax rates on our business; our expectations with respect to the impact of acquisitions and divestitures, including the acquisition of the assets of K.F. (Cambodia) Ltd. and of PathoQuest SAS, the divestitures of the Company's CDMO and Cell Solutions businesses, the sale of certain of our European Discovery Services sites, and the sale of certain assets including real estate; our service offerings, client perception, strategic relationships, revenue, revenue growth rates, revenue growth drivers, and earnings; the development and performance of our services and products, including our investments in our portfolio; market and industry conditions including the outsourcing of services and identification of spending trends by our clients and funding available to them; ability to gain market share and capitalize on business and growth opportunities; the impact of our restructuring initiatives, including annualized savings; and the impact of our stock repurchase authorization. Forward-looking statements are based on Charles River’s current expectations and beliefs, speak only as of the date of this press release, and involve a number of risks and uncertainties that are difficult to predict and that could cause actual results to differ materially from those stated or implied by the forward-looking statements. Those risks and uncertainties include, but are not limited to: the impact of NHP supply constraints; changes and uncertainties in the global economy and financial markets, including 6

disruptions in the global economy caused by geopolitical conflicts; the ability to successfully integrate businesses we acquire, and risks and uncertainties associated with businesses that we acquire; the timing and magnitude of our share repurchases; negative trends in research and development spending, negative trends in the level of outsourced services, or other cost reduction actions by our clients; the ability to convert backlog to revenue; demand and booking trends; special interest groups; contaminations; industry trends; new displacement technologies; USDA and FDA regulations; changes in law; continued availability of products and supplies; the impact of unauthorized access into our information systems; loss of key personnel; interest rate and foreign currency exchange rate fluctuations; changes in tax regulation and laws; changes in generally accepted accounting principles; and any changes in business, political, or economic conditions due to the threat of future terrorist activity in the U.S. and other parts of the world, and related U.S. military action overseas. A further description of these risks, uncertainties, and other matters can be found in the Risk Factors detailed in Charles River's Annual Report on Form 10-K as filed on February 18, 2026, as well as other filings we make with the Securities and Exchange Commission. Because forward-looking statements involve risks and uncertainties, actual results and events may differ materially from results and events currently expected by Charles River. Charles River assumes no obligation and expressly disclaims any duty to update information contained in this press release except as required by law.

Charles River provides essential products and services to help pharmaceutical and biotechnology companies, government agencies and leading academic institutions around the globe accelerate their research and drug development efforts. Our dedicated employees are focused on providing clients with exactly what they need to improve and expedite the discovery, early-stage development and safe manufacture of new therapies for the patients who need them. To learn more about our unique portfolio and breadth of services, visit www.criver.com. # # # Investor Contact: Media Contact:

CHARLES RIVER LABORATORIES INTERNATIONAL, INC. SCHEDULE 2 CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (in thousands, except per share amounts) Assets September 26, December 27, Current assets: 2026 2025 ────────────────────────────────────────────────────────────────────────────── Cash and cash $ 200,381 $ 213,770 equivalents Trade receivables and contract assets, net of allowances for 735,305 708,856 credit losses of $10,511 and $10,463, respectively Inventories 319,638 299,103 Prepaid assets 97,265 96,108 Other current 182,439 129,212 assets Total current 1,535,028 1,447,049 assets Property, plant and equipment, 1,497,335 1,655,219 net Venture capital and strategic 194,521 206,972 equity investments Operating lease right-of-use 332,330 361,415 assets, net Goodwill 3,084,112 2,764,253 Intangible 238,662 339,995 assets, net Deferred tax 67,467 67,334 assets Other assets 502,052 293,185 Total assets $ 7,451,507 $ 7,135,422 Liabilities, Redeemable Noncontrolling Interests and Equity Current liabilities: Accounts $ 144,507 $ 148,800 payable Accrued 225,937 268,854 compensation Deferred 204,204 210,418 revenue Accrued 285,737 270,085 liabilities Other current 228,873 222,158 liabilities Total current 1,089,258 1,120,315 liabilities Long-term debt, net and finance 2,443,461 2,136,360 leases Operating lease right-of-use 405,351 434,048 liabilities Deferred tax 81,815 95,203 liabilities Other long-term 156,356 138,302 liabilities Total 4,176,241 3,924,228 liabilities Redeemable noncontrolling 43,173 41,263 interests Equity: Preferred stock, $0.01 par value; 20,000 shares — — authorized; no shares issued and outstanding Common stock, $0.01 par value; 120,000 shares authorized; 49,699 shares issued and 47,876 shares 497 492 outstanding as of September 26, 2026, and 49,217 shares issued and outstanding as of December 27, 2025 Additional 2,035,124 1,947,301 paid-in capital Retained 1,705,362 1,388,620 earnings Treasury stock, at cost, 1,823 and zero shares, as of September 26, -323,281 — 2026 and December 27, 2025, respectively Accumulated other -190,691 -171,783 comprehensive loss Total Charles River Laboratories 3,227,011 3,164,630 International, Inc. equity Nonredeemable noncontrolling 5,082 5,301 interest Total equity 3,232,093 3,169,931 Total liabilities, redeemable $ 7,451,507 $ 7,135,422 noncontrolling interests and equity

CHARLES RIVER LABORATORIES INTERNATIONAL, INC. SCHEDULE 3 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (in thousands) Cash flows Nine Months relating to Ended operating September 26, September 27, activities 2026 2025 ────────────────────────────────────────────────────────────────────────────── Net income $ 318,882 $ 134,127 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and 206,701 325,035 amortization Long-lived asset 27,171 36,185 impairments Stock-based 62,929 53,451 compensation Deferred -4,089 -15,122 income taxes Reversal of an unrecognized tax benefit reserve and -245,638 — related interest and penalties Write down of 4,033 10,697 inventories (Gains) losses and impairments on venture capital and -4,897 33,955 strategic equity investments, net (Gain) loss on -37,776 982 sale of assets Provision for 1,935 4,559 credit losses (Gain) loss on divestitures, 180,300 -3,376 net Other, net -8,538 2,324 Changes in assets and liabilities: Trade receivables and contract -110,271 8,106 assets, net Inventories 64,440 -45,280 Accounts 25,601 40,747 payable Accrued -26,898 81,870 compensation Deferred 6,227 -12,319 revenue Customer contract 12,681 -533 deposits Other assets and 2,094 -65,282 liabilities, net Net cash provided by 474,887 590,126 operating activities Cash flows relating to investing activities Acquisition of businesses and assets, -467,254 — net of cash acquired Capital -133,823 -130,202 expenditures Purchases of investments and contributions -14,718 -12,544 to venture capital investments Proceeds from sale of 18,876 5,637 investments Proceeds from surrender of life 58,127 — insurance policies Proceeds from sale of 176,563 17,441 businesses and assets, net Other, net -7,292 3,154 Net cash used in investing -369,521 -116,514 activities Cash flows relating to financing activities Proceeds from long-term debt and 1,420,223 1,070,861 revolving credit facility Payments on long-term debt, revolving -1,081,266 -1,141,500 credit facility, and finance lease obligations Proceeds from exercises of 29,733 3 stock options Purchase of -324,105 -360,577 treasury stock Payment of contingent consideration and -111,394 -21,822 deferred acquisition consideration Purchase of remaining equity interests — -19,140 of other redeemable noncontrolling interest Other, net -4,274 -12,687 Net cash used in financing -71,083 -484,862 activities Effect of exchange rate changes on cash, -1,199 14,900 cash equivalents, and restricted cash Net change in cash, cash equivalents, 33,084 3,650 and restricted cash Cash, cash equivalents, and restricted 215,997 205,570 cash, beginning of period Cash, cash equivalents, and restricted $ 249,081 $ 209,220 cash, end of period

CHAR… RIVER LABO… INTE… INC. SCHE… 5 RECO… OF GAAP EARN… TO NON-… EARN… (UNA… (in thou… exce… per Three Septe… Septe… Nine Sept… Septe… share Months 26, 27, Months 26, 27, data) Ended 2026 2025 Ended 2026 2025 ────────────────────────────────────────────────────────────────────────────── Net inco… avai… to Char… River $ 333,0… $ 54,422 $ 316,… $ 132,2… Labo… Inte… Inc. comm… shar… Add back: Non-… adju… to 22,123 62,632 148,… 302,1… oper… inco… Vent… capi… and stra… equi… 2,231 20,201 -4,6… 31,594 inve… loss… and impa… net (Gai… loss 461 — 180,… -3,376 on dive… Accr… of defe… 1,081 — 2,741 — acqu… cons… Tax effe… of non-… adju… Enac… tax — 3,236 — 3,236 law chan… Tax impa… — — -35,… — of dive… Inte… on acqu… — — 11,2… — unce… tax posi… Reve… of an unre… tax bene… rese… -201,… — -201… — and rela… inte… and pena… Tax effe… of the -7,778 -20,1… -20,… -72,3… rema… non-… adju… Net inco… avai… to Char… River Labo… $ 150,1… $ 120,3… $ 398,… $ 393,4… Inte… Inc. comm… shar… excl… non-… adju… Weig… aver… shar… 47,803 49,213 48,2… 49,680 outs… - Basic Effe… of dilu… secu… Stock opti… rest… stock units 781 213 641 186 and perf… share units Weig… aver… shar… 48,584 49,426 48,8… 49,866 outs… - Dilu… Earn… per share attr… to comm… shar… Basic $ 6.97 $ 1.11 $ 6.56 $ 2.66 Dilu… $ 6.86 $ 1.10 $ 6.48 $ 2.65 Basi… excl… $ 3.14 $ 2.45 $ 8.25 $ 7.92 non-… adju… Dilu… excl… $ 3.09 $ 2.43 $ 8.14 $ 7.89 non-… adju… Charl… River manag… belie… that suppl… non-G… finan… measu… provi… useful infor… to allow inves… to gain a meani… under… of our core opera… resul… and future prosp… witho… the effect of often… charg… and other items which are outsi… our normal opera… consi… with the manner in which manag… measu… (1) and forec… the Compa… perfo… The suppl… non-G… finan… measu… inclu… are not meant to be consi… super… to, or a subst… for resul… of opera… prepa… in accor… with U.S. GAAP. The Compa… inten… to conti… to assess the poten… value of repor… non-G… resul… consi… with appli… rules, regul… and guida… This amount exclu… non-G… (2) adjus… attri… to nonco… inter… holde… The amount inclu… in the nine month period ended Septe… 26, 2026 prima… refle… a $181.7 milli… loss on the CDMO and Cell Solut… (3) Dives… net with a $1.4 milli… gain on the Europ… Disco… Dives… The amount inclu… in 2025 relat… to a gain on the sale of a DSA site. Repre… non-c… inter… expen… recog… from the accre… of (4) defer… purch… consi… assoc… with the Cambo… NHP Suppl… acqui… The amount inclu… in the nine month period ended Septe… 26, 2026 refle… the tax benef… resul… from the (5) rever… of an unrec… tax benef… reser… follo… newly enact… tax legis… and compl… of certa… tax requi… in a forei… juris…

Full text with the tables
                                                                                
  Exhibit 99.1                                                                  
                                                                                
                                                                                
  NEWS RELEASE                                                                  
                                                                                
        Charles River Laboratories Announces Third-Quarter 2026 Results         
                                                                                
  WILMINGTON, MA, November 4, 2026                                              
                                                                                
– Charles River Laboratories International, Inc. (NYSE: CRL) today reported its
results for the third quarter ended September 26, 2026.
                                                                                
  Key Highlights                                                                
                                                                                
• Reports third-quarter revenue of $982.7 million, GAAP earnings per share of
$6.86, and non-GAAP earnings per share of $3.09.

• Organic revenue growth of 4.7%, outperforming the Company's prior outlook and
representing a return to organic revenue growth for the second consecutive
quarter.

• Operating margin increased year-over-year, with non-GAAP operating margin
increasing 330 basis points to 23.0% and GAAP operating margin increasing 730
basis points to 20.6%.

• Non-GAAP earnings per share increased 27.2% year-over-year.

• Increases 2026 guidance for revenue and non-GAAP earnings per share.

• Organic revenue guidance increasing by 100 basis points and non-GAAP earnings
per share guidance increasing by $0.15 at midpoint.

• Guidance increases primarily driven by third-quarter outperformance, led by a
better-than-expected performance in the DSA segment and a lower tax rate.

• Charles River unveiled its Pathway to Purpose strategic vision and Create the
Future TM initiative at its 2026 Investor Day, outlining initiatives designed to
enhance operational excellence, strengthen scientific leadership, and drive
long-term value creation.

• The Company advanced modernization efforts through the implementation of its
Endosafe ® Cartridge Technology Automated Manufacturing Suite, which utilizes a
fully automated production suite to increase production capacity and strengthen
manufacturing controls and digital traceability. In addition, the Company
partnered with Autolomous to launch Apollo Orchestrate TM , a new capability
within Charles River's Apollo ® platform to digitize and transform laboratory
workflows, increase efficiency, and provide greater transparency and
connectivity with clients.

• Charles River has also taken steps to continue to strengthen its scientific
capabilities. It recently announced an industry collaboration with the U.S. Food
and Drug Administration (FDA) to validate preclinical screening tools to
quantify and rank the abuse potential of new drugs.

• To further advance its Alternative Methods Advancement Project TM (AMAP TM )
initiative, the Company introduced a new, rapid cell banking program designed to
significantly accelerate product release timelines in its Biologics Testing
Solutions business by incorporating in vitro next-generation sequencing
capabilities into the cell bank production process. In addition, its Virtual
Control Group (VCG) database and methodology will be
                                       1                                        
                                                                                
  Exhibit 99.1                                                                  
                                                                                
used in an upcoming Good Laboratory Practice (GLP)-compliant safety assessment
study for Ipsen.
                                                                                
  Third-Quarter Results                                                         
                                                                                
Revenue was $982.7 million, a decrease of 2.2% from $1,004.9 million in the
third quarter of 2025, primarily driven by the impact of the May 2026
divestitures. On an organic basis, revenue increased 4.7%, driven by revenue
growth in the Manufacturing Solutions (Manufacturing) and Discovery and Safety
Assessment (DSA) segments. Organic revenue growth excludes the effect of
acquisitions, divestitures, and foreign currency translation.

In the third quarter of 2026, the GAAP operating margin was 20.6%, compared to
13.3% in the third quarter of 2025, driven primarily by a benefit of $44.6
million in the DSA segment from the reversal of acquired non-income tax reserves
following newly enacted tax legislation and completion of certain tax
requirements in a foreign jurisdiction. The GAAP net income available to common
shareholders for the third quarter of 2026 was $333.1 million, or $6.86 per
diluted share, compared to GAAP net income of $54.4 million, or $1.10 per
diluted share for the same period in 2025. The GAAP net income and earnings per
share increases included a benefit totaling $245.6 million, or $5.06 per share,
associated with the reversal of acquired tax reserves following newly enacted
tax legislation and completion of certain tax requirements in a foreign
jurisdiction.

On a non-GAAP basis, the third-quarter operating margin increased to 23.0% from
19.7% in the third quarter of 2025, primarily as a result of the benefit of the
CDMO divestiture and operating leverage from higher sales volume for safety
assessment services. Non-GAAP net income was $150.1 million for the third
quarter of 2026, an increase of 24.8% from $120.3 million for the same period in
2025. Third-quarter diluted earnings per share on a non-GAAP basis were $3.09,
an increase of 27.2% from $2.43 per share in the third quarter of 2025. The non-
GAAP net income and earnings per share increases were driven primarily by the
higher operating margin and a lower tax rate.

Birgit Girshick, Chief Executive Officer, said, “In the third quarter, we were
encouraged by the continued strength of the biopharmaceutical demand environment
and that was reflected in our financial results. Revenue and earnings per share
outperformed our prior expectations, DSA net bookings and proposals continued to
show robust, year-over-year increases, and we continued to make meaningful
progress towards our strategy and long-term financial targets. We see
significant opportunities to continue to strengthen Charles River’s position as
a leading scientific partner for regulated testing across the drug development
continuum. Through our Pathway to Purpose strategy, we are building a more
agile, client-centric organization that will deepen client relationships, expand
engagement across our portfolio, and increase our share of R&D spend as demand
trends continue to improve."
                                                                                
  Third-Quarter Segment Results                                                 
                                                                                
                                                                                
  Discovery and Safety Assessment (DSA)                                         
                                                                                
Revenue for the DSA segment was $596.3 million in the third quarter of 2026, a
decrease of 0.7% from $600.7 million in the third quarter of 2025, primarily
driven by the divestiture of
                                       2                                        
                                                                                
  Exhibit 99.1                                                                  
                                                                                
certain European Discovery Services sites. Organic revenue increased by 5.9%,
driven primarily by higher study volume for regulated safety assessment
services.

In the third quarter of 2026, the DSA segment’s GAAP operating margin increased
to 28.9% from 20.5% in the third quarter of 2025. The increase was primarily
driven by the reversal of acquired non-income tax reserves. On a non-GAAP basis,
the operating margin increased to 26.8% from 25.4% in the third quarter of 2025.
The non-GAAP operating margin increase was primarily driven by operating
leverage from higher study volume for regulated safety assessment services, as
well as lower sourcing costs for large research models.
                                                                                
  Manufacturing Solutions (Manufacturing)                                       
                                                                                
Revenue for the Manufacturing segment was $178.9 million in the third quarter of
2026, a decrease of 6.2% from $190.7 million in the third quarter of 2025,
primarily driven by the CDMO divestiture. Organic revenue increased 7.4%, driven
by strong demand in both the Biologics Testing Solutions and Microbial Solutions
businesses.

The Manufacturing segment’s GAAP operating margin was 35.7%, compared to 20.9%
in the third quarter of 2025. On a non-GAAP basis, the operating margin
increased to 38.6% from 26.7% in the third quarter of 2025. The GAAP and non-
GAAP increases were driven primarily by the benefit of the CDMO divestiture.
                                                                                
  Research Models and Services (RMS)                                            
                                                                                
Revenue for the RMS segment was $207.5 million in the third quarter of 2026, a
decrease of 2.8% from $213.5 million in the third quarter of 2025, primarily
driven by the Cell Solutions divestiture. Organic revenue decreased by 0.6%, due
primarily to lower revenue for small research models in North America and for
large research models. The decline was partially offset by higher revenue for
small research models in China and for research model services, particularly the
Insourcing Solutions business.

In the third quarter of 2026, the RMS segment’s GAAP operating margin increased
to 19.9% from 16.2% in the third quarter of 2025, primarily due to lower costs
related to the Cell Solutions divestiture and restructuring initiatives. On a
non-GAAP basis, the operating margin decreased to 24.4% from 25.0%. The non-GAAP
operating margin decrease was primarily driven by the impact of an unfavorable
revenue mix, both geographically and related to large research models.
                                                                                
  2026 Guidance Update                                                          
                                                                                
The Company is increasing its 2026 revenue and earnings per share guidance,
which was last updated on August 5, 2026. This increase primarily reflects the
third-quarter outperformance, which was principally driven by the better-than-
expected performance in the DSA segment and a lower tax rate. On a GAAP basis,
the Company is also increasing its earnings per share guidance, due primarily to
the third-quarter benefit associated with the reversal of acquired tax reserves.
                                       3                                        
                                                                                
  Exhibit 99.1                                                                  
                                                                                
The Company’s 2026 guidance for revenue and earnings per share is as follows:
                                                                                
  2026 GUIDANCE                                     CURRENT              PRIOR  
  Revenue growth/(decrease), reported       (2.0)% - (1.5)%    (3.5)% - (2.5)%  
  Less: Contribution from acquisitions        0.0% - (0.5)%      0.0% - (0.5)%  
  Add: Impact from divestitures                       ~4.5%              ~4.5%  
  Less: Favorable impact of foreign         (0.5)% - (1.0)%    (0.5)% - (1.0)%  
  exchange                                                                      
  Revenue growth/(decrease), organic (1)     At least +1.5%        0.0% - 1.0%  
  GAAP EPS estimate                           $8.15 – $8.35      $3.05 – $3.35  
  Acquisition-related amortization (2)               ~$2.10             ~$2.30  
  Acquisition- and divestiture-related               ~$4.70             ~$4.75  
  costs (3)                                                                     
  Reversal of acquired tax reserves (4)              -$5.03                 --  
  Costs associated with restructuring                                           
  and                                                ~$1.50             ~$1.20  
  efficiency initiatives (5)                                                    
  Other, net (6)                                     -$0.03             -$0.17  
  Non-GAAP EPS estimate                     $11.35 – $11.55    $11.15 – $11.45  
                                                                                
Footnotes to Guidance Table:

(1) Organic revenue growth is defined as reported revenue growth adjusted for
completed acquisitions and divestitures (including the CDMO and Cell Solutions
businesses, as well as certain European Discovery Services sites), as well as
foreign currency translation.

(2) These adjustments primarily include amortization related to intangible
assets, as well as the purchase accounting step-up on inventory and certain
long-term biological assets.

(3) These adjustments include costs related to the evaluation and integration of
acquisitions and divestitures, as well as a net loss on divestitures and other
transaction-related tax adjustments.

(4) This adjustment is related to the third-quarter benefit associated with the
reversal of acquired tax reserves following newly enacted tax legislation and
completion of certain tax requirements in a foreign jurisdiction.

(5) These adjustments primarily include site consolidation (including site
transition costs), severance, impairment, third-party consulting and
professional services, and other costs related to the Company’s restructuring
actions and efficiency initiatives. These adjustments also include gains and/or
losses on the sale of certain assets and real estate.

(6) These adjustments primarily include: (i) certain venture capital and other
strategic investment losses/(gains), net. This item only includes recognized
gains or losses on certain investments. The Company does not forecast the future
performance of these investments; and (ii) reductions to a previous $27 million
inventory charge associated with a non-human primate (NHP) supply matter. As a
result of the resolution of the U.S. government investigations during fiscal
year 2025, certain NHPs were subsequently utilized.
                                                                                
  Webcast                                                                       
                                                                                
Charles River has scheduled a live webcast on Wednesday, November 4, 2026, at
9:00 a.m. ET to discuss matters relating to this press release. To participate,
please go to ir.criver.com and select the webcast link. You can also find the
associated slide presentation and reconciliations of GAAP financial measures to
non-GAAP financial measures on the website.
                                       4                                        
                                                                                
  Exhibit 99.1                                                                  
                                                                                
                                                                                
  Non-GAAP Reconciliations                                                      
                                                                                
The Company reports non-GAAP results in this press release, which exclude often-
one-time charges and other items that are outside of normal operations. A
reconciliation of GAAP to non-GAAP results is provided in the schedules at the
end of this press release.
                                                                                
  Use of Non-GAAP Financial Measures                                            
                                                                                
This press release contains non-GAAP financial measures, such as non-GAAP
earnings per share, non-GAAP operating income, non-GAAP operating margin, and
non-GAAP net income. Non-GAAP financial measures exclude, but are not limited
to, the amortization of intangible assets and the purchase accounting step-up
adjustment on inventory and certain long term biological assets, and other
charges and adjustments related to our acquisitions and divestitures, including
expenses associated with evaluating and integrating acquisitions and
divestitures, including advisory fees, certain transition costs, and certain
other transaction-related costs, as well as fair value adjustments associated
with contingent consideration; charges, gains, and losses attributable to
businesses or properties we plan to close, consolidate, or divest, including the
divestitures of our CDMO and Cell Solutions businesses, the sale of certain of
our European Discovery Services sites, and the sale of certain assets including
real estate; severance and other costs associated with our restructuring
initiatives; investment gains or losses associated with our venture capital and
certain other strategic equity investments; certain legal costs and adjustments
related to an NHP inventory charge in our DSA segment related to now concluded
U.S. government investigations into the NHP supply chain; legal and advisory
costs related to entering into a Cooperation Agreement with a shareholder; tax
effect of all of the aforementioned matters; and adjustments related to the
derecognition of certain deferred tax assets due to the CDMO Gene Therapy
intangible asset impairment charge, the recognition of deferred tax assets
expected to be utilized as a result of changes to the Company's international
financing structure, the revaluation of deferred tax liabilities as a result of
foreign tax legislation, and the tax benefit recognized as a result of the
changes in tax law enacted in a foreign jurisdiction. This press release also
refers to our revenue on both a GAAP and non-GAAP basis: on a non-GAAP basis, we
define “organic revenue growth” as reported revenue growth adjusted for foreign
currency translation, acquisitions, and divestitures. We exclude these items
from the non-GAAP financial measures because they are outside our normal
operations. There are limitations in using non-GAAP financial measures, as they
are not presented in accordance with generally accepted accounting principles,
and may be different than non-GAAP financial measures used by other companies.
In particular, we believe that the inclusion of supplementary non-GAAP financial
measures in this press release helps investors to gain a meaningful
understanding of our core operating results and future prospects without the
effect of these often-one-time charges, and is consistent with how management
measures and forecasts the Company's performance, especially when comparing such
results to prior periods or forecasts. We believe that the financial impact of
our acquisitions and divestitures (and in certain cases, the evaluation of such
acquisitions and divestitures, whether or not ultimately consummated) is often
large relative to our overall financial performance, which can adversely affect
the comparability of our results on a period-to-period basis. In addition,
certain activities and their underlying associated costs, such as business
acquisitions, generally occur periodically but on an unpredictable basis. We
calculate non-GAAP integration costs to include third-party integration costs
incurred post-acquisition.
                                       5                                        
                                                                                
  Exhibit 99.1                                                                  
                                                                                
Presenting revenue on an organic basis allows investors to measure our revenue
growth exclusive of acquisitions, divestitures, and foreign currency exchange
fluctuations more clearly. Non-GAAP results also allow investors to compare the
Company’s operations against the financial results of other companies in the
industry who similarly provide non-GAAP results. The non-GAAP financial measures
included in this press release are not meant to be considered superior to or a
substitute for results of operations presented in accordance with GAAP. The
Company intends to continue to assess the potential value of reporting non-GAAP
results consistent with applicable rules and regulations. Reconciliations of the
non-GAAP financial measures used in this press release to the most directly
comparable GAAP financial measures are set forth in this press release, and can
also be found on the Company’s website at ir.criver.com.
                                                                                
  Caution Concerning Forward-Looking Statements                                 
                                                                                
This press release includes forward-looking statements within the meaning of the
federal securities laws. Forward-looking statements may be identified by the use
of words such as “anticipate,” “believe,” “expect,” “intend,” “will,” “would,”
“may,” “estimate,” “plan,” “outlook,” and “project,” and other similar
expressions that predict or indicate future events or trends or that are not
statements of historical matters. These statements also include statements
regarding: the projected and/or anticipated future financial performance of
Charles River and our specific businesses, including as delineated in our
forward-looking guidance, and particularly our expectations with respect to
revenue, the impact of foreign exchange, interest rates, and enhanced efficiency
initiatives, including our Create the Future initiative; our expectations with
respect to our ability to gain market share; our ability to create long-term
value for our shareholders and successfully execute on our strategic
initiatives, including our Pathway to Purpose strategic vision, and the impact
and results of such initiatives; the Company’s plans or prospects, expectations
and long-term goals associated with our business; earnings per share; operating
margin; client demand, particularly the future demand for drug discovery and
development products and services, including our expectations for future revenue
trends; our expectations with respect to booking trends and the impacts thereof;
our expectations with respect to pricing of our products and services; our
expectations with respect to future tax rates and the impact of such tax rates
on our business; our expectations with respect to the impact of acquisitions and
divestitures, including the acquisition of the assets of K.F. (Cambodia) Ltd.
and of PathoQuest SAS, the divestitures of the Company's CDMO and Cell Solutions
businesses, the sale of certain of our European Discovery Services sites, and
the sale of certain assets including real estate; our service offerings, client
perception, strategic relationships, revenue, revenue growth rates, revenue
growth drivers, and earnings; the development and performance of our services
and products, including our investments in our portfolio; market and industry
conditions including the outsourcing of services and identification of spending
trends by our clients and funding available to them; ability to gain market
share and capitalize on business and growth opportunities; the impact of our
restructuring initiatives, including annualized savings; and the impact of our
stock repurchase authorization. Forward-looking statements are based on Charles
River’s current expectations and beliefs, speak only as of the date of this
press release, and involve a number of risks and uncertainties that are
difficult to predict and that could cause actual results to differ materially
from those stated or implied by the forward-looking statements. Those risks and
uncertainties include, but are not limited to: the impact of NHP supply
constraints; changes and uncertainties in the global economy and financial
markets, including
                                       6                                        
                                                                                
  Exhibit 99.1                                                                  
                                                                                
disruptions in the global economy caused by geopolitical conflicts; the ability
to successfully integrate businesses we acquire, and risks and uncertainties
associated with businesses that we acquire; the timing and magnitude of our
share repurchases; negative trends in research and development spending,
negative trends in the level of outsourced services, or other cost reduction
actions by our clients; the ability to convert backlog to revenue; demand and
booking trends; special interest groups; contaminations; industry trends; new
displacement technologies; USDA and FDA regulations; changes in law; continued
availability of products and supplies; the impact of unauthorized access into
our information systems; loss of key personnel; interest rate and foreign
currency exchange rate fluctuations; changes in tax regulation and laws; changes
in generally accepted accounting principles; and any changes in business,
political, or economic conditions due to the threat of future terrorist activity
in the U.S. and other parts of the world, and related U.S. military action
overseas. A further description of these risks, uncertainties, and other matters
can be found in the Risk Factors detailed in Charles River's Annual Report on
Form 10-K as filed on February 18, 2026, as well as other filings we make with
the Securities and Exchange Commission. Because forward-looking statements
involve risks and uncertainties, actual results and events may differ materially
from results and events currently expected by Charles River. Charles River
assumes no obligation and expressly disclaims any duty to update information
contained in this press release except as required by law.
                                                                                
  About Charles River                                                           
                                                                                
Charles River provides essential products and services to help pharmaceutical
and biotechnology companies, government agencies and leading academic
institutions around the globe accelerate their research and drug development
efforts. Our dedicated employees are focused on providing clients with exactly
what they need to improve and expedite the discovery, early-stage development
and safe manufacture of new therapies for the patients who need them. To learn
more about our unique portfolio and breadth of services, visit www.criver.com.
                                     # # #                                      
Investor Contact: Media Contact:

Todd Spencer Amy Cianciaruso

Corporate Vice President, Corporate Senior Vice President,

Investor Relations Chief Communications Officer

781.222.6455 781.222.6168

todd.spencer@crl.com amy.cianciaruso@crl.com
                                       7                                        
                                                                                
  CHARL…                                                                        
  RIVER                                                                         
  LABOR…                                                                        
  INTER…                                                                        
  INC.                                                                          
  SCHED…                                                                        
  1                                                                             
  CONDE…                                                                        
  CONSO…                                                                        
  STATE…                                                                        
  OF                                                                            
  INCOME                                                                        
  (UNAU…                                                                        
  (in                                                                           
  thous…                                                                        
  except                                                                        
  for                                                                           
  per       Three    Septem…       Septem…    Nine      Septem…                 
  share     Months       26,           27,    Months        26,       Septemb…  
  data)     Ended       2026          2025    Ended        2026       27, 2025  
 ────────────────────────────────────────────────────────────────────────────── 
  Servi…    $        780,341    $  808,042    $         2,386,…    $  2,446,8…  
  reven…                                                                        
  Produ…             202,391       196,810              595,860        574,354  
  reven…                                                                        
  Total              982,732       1,004,…              2,982,…       3,021,1…  
  reven…                                                                        
  Costs                                                                         
  and                                                                           
  expen…                                                                        
  Cost                                                                          
  of                                                                            
  servi…                                                                        
  provi…                                                                        
  (excl…             522,836       572,635              1,683,…       1,734,9…  
  amort…                                                                        
  of                                                                            
  intan…                                                                        
  asset…                                                                        
  Cost                                                                          
  of                                                                            
  produ…                                                                        
  sold                                                                          
  (excl…             102,026        93,425              282,982        272,625  
  amort…                                                                        
  of                                                                            
  intan…                                                                        
  asset…                                                                        
  Selli…                                                                        
  gener…             140,591       177,589              528,910        546,937  
  and                                                                           
  admin…                                                                        
  Amort…                                                                        
  of                  14,641        27,404               44,575        158,052  
  intan…                                                                        
  assets                                                                        
  Opera…             202,638       133,799              442,423        308,602  
  income                                                                        
  Other                                                                         
  income                                                                        
  (expe…                                                                        
  Inter…                 958         1,422                3,023          3,923  
  income                                                                        
  Inter…             -28,525       -25,403              -85,607        -83,254  
  expen…                                                                        
  Other                                                                         
  expen…              -4,414       -22,618              -165,9…        -34,675  
  net                                                                           
  Income                                                                        
  before             170,657        87,200              193,885        194,596  
  income                                                                        
  taxes                                                                         
  Provi…                                                                        
  (bene…                                                                        
  for                -163,7…        31,644              -124,9…         60,469  
  income                                                                        
  taxes                                                                         
  Net                334,444        55,556              318,882        134,127  
  income                                                                        
  Less:                                                                         
  Net                                                                           
  income                                                                        
  attri…               1,377         1,134                2,140          1,910  
  to                                                                            
  nonco…                                                                        
  inter…                                                                        
  Net                                                                           
  income                                                                        
  attri…    $        333,067    $   54,422    $         316,742    $   132,217  
  to                                                                            
  common                                                                        
  share…                                                                        
  Earni…                                                                        
  per                                                                           
  common                                                                        
  share                                                                         
  Basic     $           6.97    $     1.11    $            6.56    $      2.66  
  Dilut…    $           6.86    $     1.10    $            6.48    $      2.65  
  Weigh…                                                                        
  number                                                                        
  of                                                                            
  common                                                                        
  shares                                                                        
  outst…                                                                        
  Basic               47,803        49,213               48,258         49,680  
  Dilut…              48,584        49,426               48,899         49,866  
                                                                                
                                       8                                        
                                                                                
  CHARLES RIVER                                                                 
  LABORATORIES                                                                  
  INTERNATIONAL,                                                                
  INC.                                                                          
  SCHEDULE 2                                                                    
  CONDENSED                                                                     
  CONSOLIDATED                                                                  
  BALANCE SHEETS                                                                
  (UNAUDITED)                                                                   
  (in thousands,                                                                
  except per                                                                    
  share amounts)                                                                
  Assets             September 26,                 December 27,                 
  Current assets:    2026                          2025                         
 ────────────────────────────────────────────────────────────────────────────── 
  Cash and cash      $                  200,381    $                   213,770  
  equivalents                                                                   
  Trade                                                                         
  receivables and                                                               
  contract                                                                      
  assets,                                                                       
  net of                                                                        
  allowances for                        735,305                        708,856  
  credit losses                                                                 
  of                                                                            
  $10,511 and                                                                   
  $10,463,                                                                      
  respectively                                                                  
  Inventories                           319,638                        299,103  
  Prepaid assets                         97,265                         96,108  
  Other current                         182,439                        129,212  
  assets                                                                        
  Total current                       1,535,028                      1,447,049  
  assets                                                                        
  Property, plant                                                               
  and equipment,                      1,497,335                      1,655,219  
  net                                                                           
  Venture capital                                                               
  and strategic                         194,521                        206,972  
  equity                                                                        
  investments                                                                   
  Operating lease                                                               
  right-of-use                          332,330                        361,415  
  assets, net                                                                   
  Goodwill                            3,084,112                      2,764,253  
  Intangible                            238,662                        339,995  
  assets, net                                                                   
  Deferred tax                           67,467                         67,334  
  assets                                                                        
  Other assets                          502,052                        293,185  
  Total assets       $                7,451,507    $                 7,135,422  
  Liabilities,                                                                  
  Redeemable                                                                    
  Noncontrolling                                                                
  Interests and                                                                 
  Equity                                                                        
  Current                                                                       
  liabilities:                                                                  
  Accounts           $                  144,507    $                   148,800  
  payable                                                                       
  Accrued                               225,937                        268,854  
  compensation                                                                  
  Deferred                              204,204                        210,418  
  revenue                                                                       
  Accrued                               285,737                        270,085  
  liabilities                                                                   
  Other current                         228,873                        222,158  
  liabilities                                                                   
  Total current                       1,089,258                      1,120,315  
  liabilities                                                                   
  Long-term debt,                                                               
  net and finance                     2,443,461                      2,136,360  
  leases                                                                        
  Operating lease                                                               
  right-of-use                          405,351                        434,048  
  liabilities                                                                   
  Deferred tax                           81,815                         95,203  
  liabilities                                                                   
  Other long-term                       156,356                        138,302  
  liabilities                                                                   
  Total                               4,176,241                      3,924,228  
  liabilities                                                                   
  Redeemable                                                                    
  noncontrolling                         43,173                         41,263  
  interests                                                                     
  Equity:                                                                       
  Preferred                                                                     
  stock, $0.01                                                                  
  par value;                                                                    
  20,000                                                                        
  shares                                      —                              —  
  authorized; no                                                                
  shares issued                                                                 
  and                                                                           
  outstanding                                                                   
  Common stock,                                                                 
  $0.01 par                                                                     
  value; 120,000                                                                
  shares                                                                        
  authorized;                                                                   
  49,699 shares                                                                 
  issued                                                                        
  and 47,876                                                                    
  shares                                    497                            492  
  outstanding as                                                                
  of                                                                            
  September 26,                                                                 
  2026, and                                                                     
  49,217 shares                                                                 
  issued and                                                                    
  outstanding as                                                                
  of December                                                                   
  27, 2025                                                                      
  Additional                          2,035,124                      1,947,301  
  paid-in capital                                                               
  Retained                            1,705,362                      1,388,620  
  earnings                                                                      
  Treasury stock,                                                               
  at cost, 1,823                                                                
  and zero                                                                      
  shares, as of                                                                 
  September 26,                        -323,281                              —  
  2026 and                                                                      
  December 27,                                                                  
  2025,                                                                         
  respectively                                                                  
  Accumulated                                                                   
  other                                -190,691                       -171,783  
  comprehensive                                                                 
  loss                                                                          
  Total Charles                                                                 
  River                                                                         
  Laboratories                        3,227,011                      3,164,630  
  International,                                                                
  Inc. equity                                                                   
  Nonredeemable                                                                 
  noncontrolling                          5,082                          5,301  
  interest                                                                      
  Total equity                        3,232,093                      3,169,931  
  Total                                                                         
  liabilities,                                                                  
  redeemable         $                7,451,507    $                 7,135,422  
  noncontrolling                                                                
  interests and                                                                 
  equity                                                                        
                                                                                
                                       9                                        
                                                                                
  CHARLES RIVER                                                                 
  LABORATORIES                                                                  
  INTERNATIONAL,                                                                
  INC.                                                                          
  SCHEDULE 3                                                                    
  CONDENSED                                                                     
  CONSOLIDATED                                                                  
  STATEMENTS OF                                                                 
  CASH FLOWS                                                                    
  (UNAUDITED)                                                                   
  (in thousands)                                                                
  Cash flows        Nine Months                                                 
  relating to       Ended                                                       
  operating         September 26,                  September 27,                
  activities        2026                           2025                         
 ────────────────────────────────────────────────────────────────────────────── 
  Net income        $                   318,882    $                   134,127  
  Adjustments to                                                                
  reconcile net                                                                 
  income to                                                                     
  net cash                                                                      
  provided by                                                                   
  operating                                                                     
  activities:                                                                   
  Depreciation                                                                  
  and                                   206,701                        325,035  
  amortization                                                                  
  Long-lived                                                                    
  asset                                  27,171                         36,185  
  impairments                                                                   
  Stock-based                            62,929                         53,451  
  compensation                                                                  
  Deferred                               -4,089                        -15,122  
  income taxes                                                                  
  Reversal of an                                                                
  unrecognized                                                                  
  tax benefit                                                                   
  reserve and                          -245,638                              —  
  related                                                                       
  interest and                                                                  
  penalties                                                                     
  Write down of                           4,033                         10,697  
  inventories                                                                   
  (Gains) losses                                                                
  and                                                                           
  impairments on                                                                
  venture                                                                       
  capital and                            -4,897                         33,955  
  strategic                                                                     
  equity                                                                        
  investments,                                                                  
  net                                                                           
  (Gain) loss on                        -37,776                            982  
  sale of assets                                                                
  Provision for                           1,935                          4,559  
  credit losses                                                                 
  (Gain) loss on                                                                
  divestitures,                         180,300                         -3,376  
  net                                                                           
  Other, net                             -8,538                          2,324  
  Changes in                                                                    
  assets and                                                                    
  liabilities:                                                                  
  Trade                                                                         
  receivables                                                                   
  and contract                         -110,271                          8,106  
  assets,                                                                       
  net                                                                           
  Inventories                            64,440                        -45,280  
  Accounts                               25,601                         40,747  
  payable                                                                       
  Accrued                               -26,898                         81,870  
  compensation                                                                  
  Deferred                                6,227                        -12,319  
  revenue                                                                       
  Customer                                                                      
  contract                               12,681                           -533  
  deposits                                                                      
  Other assets                                                                  
  and                                     2,094                        -65,282  
  liabilities,                                                                  
  net                                                                           
  Net cash                                                                      
  provided by                           474,887                        590,126  
  operating                                                                     
  activities                                                                    
  Cash flows                                                                    
  relating to                                                                   
  investing                                                                     
  activities                                                                    
  Acquisition of                                                                
  businesses and                                                                
  assets,                              -467,254                              —  
  net of cash                                                                   
  acquired                                                                      
  Capital                              -133,823                       -130,202  
  expenditures                                                                  
  Purchases of                                                                  
  investments                                                                   
  and                                                                           
  contributions                         -14,718                        -12,544  
  to venture                                                                    
  capital                                                                       
  investments                                                                   
  Proceeds from                                                                 
  sale of                                18,876                          5,637  
  investments                                                                   
  Proceeds from                                                                 
  surrender of                                                                  
  life                                   58,127                              —  
  insurance                                                                     
  policies                                                                      
  Proceeds from                                                                 
  sale of                               176,563                         17,441  
  businesses and                                                                
  assets, net                                                                   
  Other, net                             -7,292                          3,154  
  Net cash used                                                                 
  in investing                         -369,521                       -116,514  
  activities                                                                    
  Cash flows                                                                    
  relating to                                                                   
  financing                                                                     
  activities                                                                    
  Proceeds from                                                                 
  long-term debt                                                                
  and                                 1,420,223                      1,070,861  
  revolving                                                                     
  credit                                                                        
  facility                                                                      
  Payments on                                                                   
  long-term                                                                     
  debt,                                                                         
  revolving                          -1,081,266                     -1,141,500  
  credit                                                                        
  facility, and                                                                 
  finance lease                                                                 
  obligations                                                                   
  Proceeds from                                                                 
  exercises of                           29,733                              3  
  stock options                                                                 
  Purchase of                          -324,105                       -360,577  
  treasury stock                                                                
  Payment of                                                                    
  contingent                                                                    
  consideration                                                                 
  and                                  -111,394                        -21,822  
  deferred                                                                      
  acquisition                                                                   
  consideration                                                                 
  Purchase of                                                                   
  remaining                                                                     
  equity                                                                        
  interests                                   —                        -19,140  
  of other                                                                      
  redeemable                                                                    
  noncontrolling                                                                
  interest                                                                      
  Other, net                             -4,274                        -12,687  
  Net cash used                                                                 
  in financing                          -71,083                       -484,862  
  activities                                                                    
  Effect of                                                                     
  exchange rate                                                                 
  changes on                                                                    
  cash,                                  -1,199                         14,900  
  cash                                                                          
  equivalents,                                                                  
  and restricted                                                                
  cash                                                                          
  Net change in                                                                 
  cash, cash                                                                    
  equivalents,                           33,084                          3,650  
  and restricted                                                                
  cash                                                                          
  Cash, cash                                                                    
  equivalents,                                                                  
  and restricted                        215,997                        205,570  
  cash,                                                                         
  beginning of                                                                  
  period                                                                        
  Cash, cash                                                                    
  equivalents,                                                                  
  and restricted    $                   249,081    $                   209,220  
  cash, end of                                                                  
  period                                                                        
                                                                                
                                       10                                       
                                                                                
  CH…                                                                           
  RI…                                                                           
  LA…                                                                           
  IN…                                                                           
  IN…                                                                           
  SC…                                                                           
  4                                                                             
  RE…                                                                           
  OF                                                                            
  GA…                                                                           
  TO                                                                            
  NO…                                                                           
  SE…                                                                           
  BU…                                                                           
  SE…                                                                           
  IN…                                                                           
  (U…                                                                           
  (in                                                                           
  th…                                                                           
  ex…            Thr…                             Ni…                           
  pe…            Mon…                             Mo…                           
  Di…            End…                             En…                           
  and            Sep…             Se…             Se…             Se…           
  Sa…            26,              27,             26,             27,           
  As…            2026             20…             20…             20…           
 ────────────────────────────────────────────────────────────────────────────── 
         Rev…    $     596…       $    600…       $    1,7…       $    1,8…     
         Ope…          172…            123…            400…            339…     
         inc…                                                                   
         Ope…                                                                   
         inc…                                                                   
         as a          28.9  %         20.5  %         22.3  %         18.8  %  
         % of                                                                   
         rev…                                                                   
         Add                                                                    
         bac…                                                                   
         Amo…                                                                   
         rel…          22,…            19,…            57,…            55,…     
         to                                                                     
         acq…                                                                   
         Acq…                                                                   
         int…                                                                   
         and           -43…            2,4…            -35…            4,7…     
         div…                                                                   
         adj…                                                                   
         Sev…          4,4…            -148            8,1…            5,0…     
         Ass…             —             693            3,2…            22,…     
         imp…                                                                   
         Cost                                                                   
         sav…                                                                   
         and           5,1…            3,9…            13,…            10,…     
         eff…                                                                   
         ini…                                                                   
         Thi…                                                                   
         leg…                                                                   
         and                                                                    
         adv…                                                                   
         cos…          -1,…            3,2…            -8,…            25,…     
         and                                                                    
         cer…                                                                   
         rel…                                                                   
         ite…                                                                   
         Tot…                                                                   
         non…                                                                   
         adj…    $     -12…       $    29,…       $    39,…       $    123…     
         to                                                                     
         ope…                                                                   
         inc…                                                                   
         Ope…                                                                   
         inc…                                                                   
         exc…    $     159…       $    152…       $    439…       $    463…     
         non…                                                                   
         adj…                                                                   
         Non…                                                                   
         ope…                                                                   
         inc…          26.8  %         25.4  %         24.4  %         25.6  %  
         as a                                                                   
         % of                                                                   
         rev…                                                                   
         Dep…                                                                   
         and     $     45,…       $    44,…       $    126…       $    128…     
         amo…                                                                   
         Cap…    $     30,…       $    25,…       $    87,…       $    78,…     
         exp…                                                                   
  Ma…                                                                           
  So…                                                                           
         Rev…    $     178…       $    190…       $    557…       $    570…     
         Ope…          63,…            39,…            176…            43,…     
         inc…                                                                   
         Ope…                                                                   
         inc…                                                                   
         as a          35.7  %         20.9  %         31.6  %          7.6  %  
         % of                                                                   
         rev…                                                                   
         Add                                                                    
         bac…                                                                   
         Amo…                                                                   
         rel…          2,1…            8,2…            6,1…            100…     
         to                                                                     
         acq…                                                                   
         Acq…                                                                   
         int…                                                                   
         and           1,4…               —            4,1…               —     
         div…                                                                   
         adj…                                                                   
         Sev…          1,3…            1,2…             806            3,1…     
         Ass…           316              91             567            6,4…     
         imp…                                                                   
         Cost                                                                   
         sav…                                                                   
         and              —            1,2…            1,5…            4,2…     
         eff…                                                                   
         ini…                                                                   
         Tot…                                                                   
         non…                                                                   
         adj…    $     5,2…       $    10,…       $    13,…       $    114…     
         to                                                                     
         ope…                                                                   
         inc…                                                                   
         Ope…                                                                   
         inc…                                                                   
         exc…    $     69,…       $    50,…       $    189…       $    157…     
         non…                                                                   
         adj…                                                                   
         Non…                                                                   
         ope…                                                                   
         inc…          38.6  %         26.7  %         34.0  %         27.7  %  
         as a                                                                   
         % of                                                                   
         rev…                                                                   
         Dep…                                                                   
         and     $     7,7…       $    17,…       $    23,…       $    127…     
         amo…                                                                   
         Cap…    $     6,8…       $    5,1…       $    18,…       $    33,…     
         exp…                                                                   
  Re…                                                                           
  Mo…                                                                           
  and                                                                           
  Se…                                                                           
         Rev…    $     207…       $    213…       $    625…       $    639…     
         Ope…          41,…            34,…            127…            113…     
         inc…                                                                   
         Ope…                                                                   
         inc…                                                                   
         as a          19.9  %         16.2  %         20.4  %         17.8  %  
         % of                                                                   
         rev…                                                                   
         Add                                                                    
         bac…                                                                   
         Amo…                                                                   
         rel…          7,0…            12,…            21,…            36,…     
         to                                                                     
         acq…                                                                   
         Acq…                                                                   
         int…                                                                   
         and              —               —              67              14     
         div…                                                                   
         adj…                                                                   
         Sev…           817             136            1,4…            3,6…     
         Ass…             —            4,6…            22,…            7,4…     
         imp…                                                                   
         Cost                                                                   
         sav…                                                                   
         and           1,5…            1,0…            -18…            3,5…     
         eff…                                                                   
         ini…                                                                   
         Tot…                                                                   
         non…                                                                   
         adj…    $     9,4…       $    18,…       $    26,…       $    50,…     
         to                                                                     
         ope…                                                                   
         inc…                                                                   
         Ope…                                                                   
         inc…                                                                   
         exc…    $     50,…       $    53,…       $    153…       $    164…     
         non…                                                                   
         adj…                                                                   
         Non…                                                                   
         ope…                                                                   
         inc…          24.4  %         25.0  %         24.5  %         25.8  %  
         as a                                                                   
         % of                                                                   
         rev…                                                                   
         Dep…                                                                   
         and     $     16,…       $    21,…       $    48,…       $    63,…     
         amo…                                                                   
         Cap…    $     9,4…       $    3,1…       $    25,…       $    14,…     
         exp…                                                                   
  Un…                                                                           
  Co…            $     -74…       $    -63…       $    -26…       $    -18…     
  Ov…                                                                           
         Add                                                                    
         bac…                                                                   
         Acq…                                                                   
         int…                                                                   
         and           10,…             772            45,…            3,6…     
         div…                                                                   
         adj…                                                                   
         Sev…          2,4…            3,5…            7,1…            5,1…     
         Ass…           422               —             965             184     
         imp…                                                                   
         Cost                                                                   
         sav…                                                                   
         and           8,1…             767            19,…            1,4…     
         eff…                                                                   
         ini…                                                                   
         Thi…                                                                   
         leg…                                                                   
         and              —            -146               —            6,2…     
         adv…                                                                   
         cos…                                                                   
         Tot…                                                                   
         non…                                                                   
         adj…    $     21,…       $    4,9…       $    72,…       $    16,…     
         to                                                                     
         ope…                                                                   
         exp…                                                                   
         Una…                                                                   
         cor…                                                                   
         ove…    $     -53…       $    -58…       $    -18…       $    -17…     
         exc…                                                                   
         non…                                                                   
         adj…                                                                   
  To…                                                                           
         Rev…    $     982…       $    1,0…       $    2,9…       $    3,0…     
         Ope…          202…            133…            442…            308…     
         inc…                                                                   
         Ope…                                                                   
         inc…                                                                   
         as a          20.6  %         13.3  %         14.8  %         10.2  %  
         % of                                                                   
         rev…                                                                   
         Add                                                                    
         bac…                                                                   
         Amo…                                                                   
         rel…          31,…            40,…            85,…            192…     
         to                                                                     
         acq…                                                                   
         Acq…                                                                   
         int…                                                                   
         and           -31…            3,1…            13,…            8,4…     
         div…                                                                   
         adj…                                                                   
         Sev…          9,1…            4,7…            17,…            16,…     
         Ass…           738            5,4…            26,…            36,…     
         imp…                                                                   
         Cost                                                                   
         sav…                                                                   
         and           14,…            7,0…            16,…            19,…     
         eff…                                                                   
         ini…                                                                   
         Thi…                                                                   
         leg…                                                                   
         and                                                                    
         adv…                                                                   
         cos…          -1,…            3,0…            -8,…            31,…     
         and                                                                    
         cer…                                                                   
         rel…                                                                   
         ite…                                                                   
         Tot…                                                                   
         non…                                                                   
         adj…    $     23,…       $    63,…       $    151…       $    305…     
         to                                                                     
         ope…                                                                   
         inc…                                                                   
         Ope…                                                                   
         inc…                                                                   
         exc…    $     225…       $    197…       $    594…       $    614…     
         non…                                                                   
         adj…                                                                   
         Non…                                                                   
         ope…                                                                   
         inc…          23.0  %         19.7  %         19.9  %         20.3  %  
         as a                                                                   
         % of                                                                   
         rev…                                                                   
         Dep…                                                                   
         and     $     72,…       $    85,…       $    206…       $    325…     
         amo…                                                                   
         Cap…    $     46,…       $    35,…       $    133…       $    130…     
         exp…                                                                   
         Cha…                                                                   
         Riv…                                                                   
         man…                                                                   
         bel…                                                                   
         that                                                                   
         sup…                                                                   
         non…                                                                   
         fin…                                                                   
         mea…                                                                   
         pro…                                                                   
         use…                                                                   
         inf…                                                                   
         to                                                                     
         all…                                                                   
         inv…                                                                   
         to                                                                     
         gain                                                                   
         a                                                                      
         mea…                                                                   
         und…                                                                   
         of                                                                     
         our                                                                    
         core                                                                   
         ope…                                                                   
         res…                                                                   
         and                                                                    
         fut…                                                                   
         pro…                                                                   
         wit…                                                                   
         the                                                                    
         eff…                                                                   
         of                                                                     
         oft…                                                                   
         cha…                                                                   
         and                                                                    
         oth…                                                                   
         ite…                                                                   
         whi…                                                                   
         are                                                                    
         out…                                                                   
         our                                                                    
         nor…                                                                   
         ope…                                                                   
         con…                                                                   
         with                                                                   
         the                                                                    
         man…                                                                   
         in                                                                     
         whi…                                                                   
         man…                                                                   
         mea…                                                                   
  (1)    and                                                                    
         for…                                                                   
         the                                                                    
         Com…                                                                   
         per…                                                                   
         The                                                                    
         sup…                                                                   
         non…                                                                   
         fin…                                                                   
         mea…                                                                   
         inc…                                                                   
         are                                                                    
         not                                                                    
         mea…                                                                   
         to                                                                     
         be                                                                     
         con…                                                                   
         sup…                                                                   
         to,                                                                    
         or a                                                                   
         sub…                                                                   
         for                                                                    
         res…                                                                   
         of                                                                     
         ope…                                                                   
         pre…                                                                   
         in                                                                     
         acc…                                                                   
         with                                                                   
         U.S.                                                                   
         GAA…                                                                   
         The                                                                    
         Com…                                                                   
         int…                                                                   
         to                                                                     
         con…                                                                   
         to                                                                     
         ass…                                                                   
         the                                                                    
         pot…                                                                   
         val…                                                                   
         of                                                                     
         rep…                                                                   
         non…                                                                   
         res…                                                                   
         con…                                                                   
         with                                                                   
         app…                                                                   
         rul…                                                                   
         reg…                                                                   
         and                                                                    
         gui…                                                                   
         The…                                                                   
         adj…                                                                   
         are                                                                    
         rel…                                                                   
         to                                                                     
         the                                                                    
         eva…                                                                   
         and                                                                    
         int…                                                                   
         of                                                                     
         acq…                                                                   
         and                                                                    
         div…                                                                   
         and                                                                    
         pri…                                                                   
         inc…                                                                   
         tra…                                                                   
         adv…                                                                   
         cer…                                                                   
         thi…                                                                   
         int…                                                                   
         cer…                                                                   
         com…                                                                   
         cos…                                                                   
         and                                                                    
         rel…                                                                   
         cos…                                                                   
         as                                                                     
         well                                                                   
         as                                                                     
         fair                                                                   
         val…                                                                   
         adj…                                                                   
         ass…                                                                   
         with                                                                   
         con…                                                                   
         con…                                                                   
         arr…                                                                   
         For                                                                    
  (2)    the                                                                    
         thr…                                                                   
         and                                                                    
         nine                                                                   
         mon…                                                                   
         end…                                                                   
         Sep…                                                                   
         26,                                                                    
         202…                                                                   
         this                                                                   
         amo…                                                                   
         inc…                                                                   
         a                                                                      
         $44…                                                                   
         mil…                                                                   
         tax                                                                    
         ben…                                                                   
         res…                                                                   
         from                                                                   
         new…                                                                   
         ena…                                                                   
         tax                                                                    
         leg…                                                                   
         and                                                                    
         com…                                                                   
         of                                                                     
         cer…                                                                   
         tax                                                                    
         req…                                                                   
         in a                                                                   
         for…                                                                   
         jur…                                                                   
         wit…                                                                   
         the                                                                    
         Dis…                                                                   
         and                                                                    
         Saf…                                                                   
         Ass…                                                                   
         rep…                                                                   
         seg…                                                                   
         Cost                                                                   
         sav…                                                                   
         and                                                                    
         eff…                                                                   
         ini…                                                                   
         in                                                                     
         2026                                                                   
         pri…                                                                   
         inc…                                                                   
         site                                                                   
         con…                                                                   
         cha…                                                                   
         rel…                                                                   
         to                                                                     
         rec…                                                                   
         site                                                                   
         opt…                                                                   
         act…                                                                   
         cost                                                                   
         of                                                                     
         pro…                                                                   
         ser…                                                                   
         rel…                                                                   
         to                                                                     
         cer…                                                                   
         imp…                                                                   
         ini…                                                                   
         and                                                                    
         a                                                                      
         pre…                                                                   
         gain                                                                   
  (3)    of                                                                     
         $38…                                                                   
         mil…                                                                   
         in                                                                     
         con…                                                                   
         with                                                                   
         the                                                                    
         sale                                                                   
         of                                                                     
         cer…                                                                   
         ass…                                                                   
         in                                                                     
         Wil…                                                                   
         Mas…                                                                   
         The                                                                    
         gain                                                                   
         was                                                                    
         rec…                                                                   
         wit…                                                                   
         the                                                                    
         RMS                                                                    
         rep…                                                                   
         seg…                                                                   
         and                                                                    
         una…                                                                   
         cor…                                                                   
         for                                                                    
         $23…                                                                   
         mil…                                                                   
         and                                                                    
         $15…                                                                   
         mil…                                                                   
         res…                                                                   
         Wit…                                                                   
         the                                                                    
         DSA                                                                    
         bus…                                                                   
         thi…                                                                   
         leg…                                                                   
         and                                                                    
         adv…                                                                   
         cos…                                                                   
         inc…                                                                   
         dur…                                                                   
         fis…                                                                   
         2025                                                                   
         rel…                                                                   
         to                                                                     
         U.S.                                                                   
         gov…                                                                   
         inv…                                                                   
         into                                                                   
         the                                                                    
         NHP                                                                    
         sup…                                                                   
         cha…                                                                   
         whi…                                                                   
         were                                                                   
         con…                                                                   
         in                                                                     
         fis…                                                                   
         202…                                                                   
         Also                                                                   
         inc…                                                                   
         wit…                                                                   
         DSA                                                                    
         res…                                                                   
         for                                                                    
         fis…                                                                   
         2026                                                                   
         is                                                                     
         the                                                                    
         uti…                                                                   
         of                                                                     
         pre…                                                                   
         wri…                                                                   
         NHP                                                                    
         inv…                                                                   
  (4)    res…                                                                   
         in                                                                     
         par…                                                                   
         rev…                                                                   
         of                                                                     
         the                                                                    
         $27                                                                    
         mil…                                                                   
         inv…                                                                   
         cha…                                                                   
         rec…                                                                   
         in                                                                     
         fis…                                                                   
         2024                                                                   
         fol…                                                                   
         the                                                                    
         res…                                                                   
         of                                                                     
         the                                                                    
         mat…                                                                   
         in                                                                     
         fis…                                                                   
         202…                                                                   
         Wit…                                                                   
         Una…                                                                   
         Cor…                                                                   
         thi…                                                                   
         leg…                                                                   
         and                                                                    
         adv…                                                                   
         cos…                                                                   
         inc…                                                                   
         dur…                                                                   
         fis…                                                                   
         2025                                                                   
         are                                                                    
         ass…                                                                   
         with                                                                   
         the                                                                    
         exe…                                                                   
         of                                                                     
         the                                                                    
         Coo…                                                                   
         Agr…                                                                   
         with                                                                   
         a                                                                      
         sha…                                                                   
         Amo…                                                                   
         rel…                                                                   
         to                                                                     
         acq…                                                                   
         for                                                                    
         the                                                                    
         nine                                                                   
         mon…                                                                   
         end…                                                                   
         Sep…                                                                   
         27,                                                                    
         2025                                                                   
         inc…                                                                   
         $71…                                                                   
         mil…                                                                   
         of                                                                     
  (5)    acc…                                                                   
         amo…                                                                   
         of                                                                     
         cer…                                                                   
         cli…                                                                   
         rel…                                                                   
         in                                                                     
         the                                                                    
         Bio…                                                                   
         Sol…                                                                   
         rep…                                                                   
         unit                                                                   
         wit…                                                                   
         the                                                                    
         Man…                                                                   
         Sol…                                                                   
         rep…                                                                   
         seg…                                                                   
                                                                                
                                       11                                       
                                                                                
  CHAR…                                                                         
  RIVER                                                                         
  LABO…                                                                         
  INTE…                                                                         
  INC.                                                                          
  SCHE…                                                                         
  5                                                                             
  RECO…                                                                         
  OF                                                                            
  GAAP                                                                          
  EARN…                                                                         
  TO                                                                            
  NON-…                                                                         
  EARN…                                                                         
  (UNA…                                                                         
  (in                                                                           
  thou…                                                                         
  exce…                                                                         
  per                Three   Septe…       Septe…    Nine    Sept…       Septe…  
  share              Months     26,          27,    Months    26,          27,  
  data)              Ended     2026         2025    Ended    2026         2025  
 ────────────────────────────────────────────────────────────────────────────── 
  Net                                                                           
  inco…                                                                         
  avai…                                                                         
  to                                                                            
  Char…                                                                         
  River              $       333,0…    $  54,422    $       316,…    $  132,2…  
  Labo…                                                                         
  Inte…                                                                         
  Inc.                                                                          
  comm…                                                                         
  shar…                                                                         
  Add                                                                           
  back:                                                                         
  Non-…                                                                         
  adju…                                                                         
  to                         22,123       62,632            148,…       302,1…  
  oper…                                                                         
  inco…                                                                         
  Vent…                                                                         
  capi…                                                                         
  and                                                                           
  stra…                                                                         
  equi…                       2,231       20,201            -4,6…       31,594  
  inve…                                                                         
  loss…                                                                         
  and                                                                           
  impa…                                                                         
  net                                                                           
  (Gai…                                                                         
  loss                          461            —            180,…       -3,376  
  on                                                                            
  dive…                                                                         
  Accr…                                                                         
  of                                                                            
  defe…                       1,081            —            2,741            —  
  acqu…                                                                         
  cons…                                                                         
  Tax                                                                           
  effe…                                                                         
  of                                                                            
  non-…                                                                         
  adju…                                                                         
  Enac…                                                                         
  tax                             —        3,236                —        3,236  
  law                                                                           
  chan…                                                                         
  Tax                                                                           
  impa…                           —            —            -35,…            —  
  of                                                                            
  dive…                                                                         
  Inte…                                                                         
  on                                                                            
  acqu…                           —            —            11,2…            —  
  unce…                                                                         
  tax                                                                           
  posi…                                                                         
  Reve…                                                                         
  of an                                                                         
  unre…                                                                         
  tax                                                                           
  bene…                                                                         
  rese…                      -201,…            —            -201…            —  
  and                                                                           
  rela…                                                                         
  inte…                                                                         
  and                                                                           
  pena…                                                                         
  Tax                                                                           
  effe…                                                                         
  of                                                                            
  the                        -7,778       -20,1…            -20,…       -72,3…  
  rema…                                                                         
  non-…                                                                         
  adju…                                                                         
  Net                                                                           
  inco…                                                                         
  avai…                                                                         
  to                                                                            
  Char…                                                                         
  River                                                                         
  Labo…              $       150,1…    $  120,3…    $       398,…    $  393,4…  
  Inte…                                                                         
  Inc.                                                                          
  comm…                                                                         
  shar…                                                                         
  excl…                                                                         
  non-…                                                                         
  adju…                                                                         
  Weig…                                                                         
  aver…                                                                         
  shar…                      47,803       49,213            48,2…       49,680  
  outs…                                                                         
  -                                                                             
  Basic                                                                         
  Effe…                                                                         
  of                                                                            
  dilu…                                                                         
  secu…                                                                         
  Stock                                                                         
  opti…                                                                         
  rest…                                                                         
  stock                                                                         
  units                         781          213              641          186  
  and                                                                           
  perf…                                                                         
  share                                                                         
  units                                                                         
  Weig…                                                                         
  aver…                                                                         
  shar…                      48,584       49,426            48,8…       49,866  
  outs…                                                                         
  -                                                                             
  Dilu…                                                                         
  Earn…                                                                         
  per                                                                           
  share                                                                         
  attr…                                                                         
  to                                                                            
  comm…                                                                         
  shar…                                                                         
  Basic              $         6.97    $    1.11    $        6.56    $    2.66  
  Dilu…              $         6.86    $    1.10    $        6.48    $    2.65  
  Basi…                                                                         
  excl…              $         3.14    $    2.45    $        8.25    $    7.92  
  non-…                                                                         
  adju…                                                                         
  Dilu…                                                                         
  excl…              $         3.09    $    2.43    $        8.14    $    7.89  
  non-…                                                                         
  adju…                                                                         
           Charl…                                                               
           River                                                                
           manag…                                                               
           belie…                                                               
           that                                                                 
           suppl…                                                               
           non-G…                                                               
           finan…                                                               
           measu…                                                               
           provi…                                                               
           useful                                                               
           infor…                                                               
           to                                                                   
           allow                                                                
           inves…                                                               
           to                                                                   
           gain a                                                               
           meani…                                                               
           under…                                                               
           of our                                                               
           core                                                                 
           opera…                                                               
           resul…                                                               
           and                                                                  
           future                                                               
           prosp…                                                               
           witho…                                                               
           the                                                                  
           effect                                                               
           of                                                                   
           often…                                                               
           charg…                                                               
           and                                                                  
           other                                                                
           items                                                                
           which                                                                
           are                                                                  
           outsi…                                                               
           our                                                                  
           normal                                                               
           opera…                                                               
           consi…                                                               
           with                                                                 
           the                                                                  
           manner                                                               
           in                                                                   
           which                                                                
           manag…                                                               
           measu…                                                               
  (1)      and                                                                  
           forec…                                                               
           the                                                                  
           Compa…                                                               
           perfo…                                                               
           The                                                                  
           suppl…                                                               
           non-G…                                                               
           finan…                                                               
           measu…                                                               
           inclu…                                                               
           are                                                                  
           not                                                                  
           meant                                                                
           to be                                                                
           consi…                                                               
           super…                                                               
           to, or                                                               
           a                                                                    
           subst…                                                               
           for                                                                  
           resul…                                                               
           of                                                                   
           opera…                                                               
           prepa…                                                               
           in                                                                   
           accor…                                                               
           with                                                                 
           U.S.                                                                 
           GAAP.                                                                
           The                                                                  
           Compa…                                                               
           inten…                                                               
           to                                                                   
           conti…                                                               
           to                                                                   
           assess                                                               
           the                                                                  
           poten…                                                               
           value                                                                
           of                                                                   
           repor…                                                               
           non-G…                                                               
           resul…                                                               
           consi…                                                               
           with                                                                 
           appli…                                                               
           rules,                                                               
           regul…                                                               
           and                                                                  
           guida…                                                               
           This                                                                 
           amount                                                               
           exclu…                                                               
           non-G…                                                               
  (2)      adjus…                                                               
           attri…                                                               
           to                                                                   
           nonco…                                                               
           inter…                                                               
           holde…                                                               
           The                                                                  
           amount                                                               
           inclu…                                                               
           in the                                                               
           nine                                                                 
           month                                                                
           period                                                               
           ended                                                                
           Septe…                                                               
           26,                                                                  
           2026                                                                 
           prima…                                                               
           refle…                                                               
           a                                                                    
           $181.7                                                               
           milli…                                                               
           loss                                                                 
           on the                                                               
           CDMO                                                                 
           and                                                                  
           Cell                                                                 
           Solut…                                                               
  (3)      Dives…                                                               
           net                                                                  
           with a                                                               
           $1.4                                                                 
           milli…                                                               
           gain                                                                 
           on the                                                               
           Europ…                                                               
           Disco…                                                               
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           The                                                                  
           amount                                                               
           inclu…                                                               
           in                                                                   
           2025                                                                 
           relat…                                                               
           to a                                                                 
           gain                                                                 
           on the                                                               
           sale                                                                 
           of a                                                                 
           DSA                                                                  
           site.                                                                
           Repre…                                                               
           non-c…                                                               
           inter…                                                               
           expen…                                                               
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           from                                                                 
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  (4)      defer…                                                               
           purch…                                                               
           consi…                                                               
           assoc…                                                               
           with                                                                 
           the                                                                  
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           NHP                                                                  
           Suppl…                                                               
           acqui…                                                               
           The                                                                  
           amount                                                               
           inclu…                                                               
           in the                                                               
           nine                                                                 
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           period                                                               
           ended                                                                
           Septe…                                                               
           26,                                                                  
           2026                                                                 
           refle…                                                               
           the                                                                  
           tax                                                                  
           benef…                                                               
           resul…                                                               
           from                                                                 
           the                                                                  
  (5)      rever…                                                               
           of an                                                                
           unrec…                                                               
           tax                                                                  
           benef…                                                               
           reser…                                                               
           follo…                                                               
           newly                                                                
           enact…                                                               
           tax                                                                  
           legis…                                                               
           and                                                                  
           compl…                                                               
           of                                                                   
           certa…                                                               
           tax                                                                  
           requi…                                                               
           in a                                                                 
           forei…                                                               
           juris…                                                               
                                                                                
                                       12                                       
                                                                                
         CHA…                                                                   
         RIV…                                                                   
         LAB…                                                                   
         INT…                                                                   
         INC.                                                                   
         SCH…                                                                   
         6                                                                      
         REC…                                                                   
         OF                                                                     
         GAAP                                                                   
         REV…                                                                   
         GRO…                                                                   
         TO                                                                     
         NON…                                                                   
         REV…                                                                   
         GRO…                                                                   
         ORG…                                                                   
         (UN…                                                                   
  Th…                                                                           
  Mo…                                                                           
  En…            Tot…             DSA             MS              RMS           
  Se…            CRL              Seg…            Seg…            Seg…          
  26,                                                                           
  20…                                                                           
  Re…                                                                           
  gr…                  -2.2  %          -0…  %          -6…  %          -2…  %  
  re…                                                                           
  (I…                                                                           
  de…                                                                           
  due                     —  %          0.2  %          0.2  %          -0…  %  
  to                                                                            
  fo…                                                                           
  ex…                                                                           
  Co…                                                                           
  fr…                  -0.2  %            —  %          -0…  %            —  %  
  ac…                                                                           
  Im…                                                                           
  of                    7.1  %          6.4  %          14…  %          2.9  %  
  di…                                                                           
  No…                                                                           
  re…                   4.7  %          5.9  %          7.4  %          -0…  %  
  gr…                                                                           
  or…                                                                           
  Ni…                                                                           
  Mo…                                                                           
  En…            Tot…             DSA             MS              RMS           
  Se…            CRL              Seg…            Seg…            Seg…          
  26,                                                                           
  20…                                                                           
  Re…                                                                           
  gr…                  -1.3  %          -0…  %          -2…  %          -2…  %  
  re…                                                                           
  (I…                                                                           
  de…                                                                           
  due                  -1.1  %          -0…  %          -1…  %          -1…  %  
  to                                                                            
  fo…                                                                           
  ex…                                                                           
  Co…                                                                           
  fr…                  -0.1  %            —  %          -0…  %            —  %  
  ac…                                                                           
  Im…                                                                           
  of                    3.5  %          2.9  %          8.1  %          1.6  %  
  di…                                                                           
  No…                                                                           
  re…                   1.0  %          1.5  %          3.8  %          -2…  %  
  gr…                                                                           
  or…                                                                           
         Cha…                                                                   
         Riv…                                                                   
         man…                                                                   
         bel…                                                                   
         that                                                                   
         sup…                                                                   
         non…                                                                   
         fin…                                                                   
         mea…                                                                   
         pro…                                                                   
         use…                                                                   
         inf…                                                                   
         to                                                                     
         all…                                                                   
         inv…                                                                   
         to                                                                     
         gain                                                                   
         a                                                                      
         mea…                                                                   
         und…                                                                   
         of                                                                     
         our                                                                    
         core                                                                   
         ope…                                                                   
         res…                                                                   
         and                                                                    
         fut…                                                                   
         pro…                                                                   
         wit…                                                                   
         the                                                                    
         eff…                                                                   
         of                                                                     
         oft…                                                                   
         cha…                                                                   
         and                                                                    
         oth…                                                                   
         ite…                                                                   
         whi…                                                                   
         are                                                                    
         out…                                                                   
         our                                                                    
         nor…                                                                   
         ope…                                                                   
         con…                                                                   
         with                                                                   
         the                                                                    
         man…                                                                   
         in                                                                     
         whi…                                                                   
         man…                                                                   
         mea…                                                                   
  (1)    and                                                                    
         for…                                                                   
         the                                                                    
         Com…                                                                   
         per…                                                                   
         The                                                                    
         sup…                                                                   
         non…                                                                   
         fin…                                                                   
         mea…                                                                   
         inc…                                                                   
         are                                                                    
         not                                                                    
         mea…                                                                   
         to                                                                     
         be                                                                     
         con…                                                                   
         sup…                                                                   
         to,                                                                    
         or a                                                                   
         sub…                                                                   
         for                                                                    
         res…                                                                   
         of                                                                     
         ope…                                                                   
         pre…                                                                   
         in                                                                     
         acc…                                                                   
         with                                                                   
         U.S.                                                                   
         GAA…                                                                   
         The                                                                    
         Com…                                                                   
         int…                                                                   
         to                                                                     
         con…                                                                   
         to                                                                     
         ass…                                                                   
         the                                                                    
         pot…                                                                   
         val…                                                                   
         of                                                                     
         rep…                                                                   
         non…                                                                   
         res…                                                                   
         con…                                                                   
         with                                                                   
         app…                                                                   
         rul…                                                                   
         reg…                                                                   
         and                                                                    
         gui…                                                                   
         The                                                                    
         con…                                                                   
         from                                                                   
  (2)    acq…                                                                   
         ref…                                                                   
         only                                                                   
         com…                                                                   
         acq…                                                                   
         Imp…                                                                   
         of                                                                     
         div…                                                                   
         rel…                                                                   
         to                                                                     
         the                                                                    
         sale                                                                   
         of                                                                     
         cer…                                                                   
         Eur…                                                                   
         Dis…                                                                   
         Ser…                                                                   
         bus…                                                                   
         in                                                                     
         May                                                                    
         2026                                                                   
         wit…                                                                   
         the                                                                    
         DSA                                                                    
         rep…                                                                   
         seg…                                                                   
         as                                                                     
  (3)    well                                                                   
         as                                                                     
         the                                                                    
         sale                                                                   
         of                                                                     
         the                                                                    
         CDMO                                                                   
         and                                                                    
         Cell                                                                   
         Sol…                                                                   
         bus…                                                                   
         in                                                                     
         May                                                                    
         2026                                                                   
         wit…                                                                   
         the                                                                    
         Man…                                                                   
         rep…                                                                   
         seg…                                                                   
         and                                                                    
         RMS                                                                    
         rep…                                                                   
         seg…                                                                   
         res…                                                                   
         Org…                                                                   
         rev…                                                                   
         gro…                                                                   
         is                                                                     
         def…                                                                   
         as                                                                     
         rep…                                                                   
  (4)    rev…                                                                   
         gro…                                                                   
         adj…                                                                   
         for                                                                    
         acq…                                                                   
         div…                                                                   
         and                                                                    
         for…                                                                   
         exc…                                                                   
                                                                                
                                       13                                       

Work on CRL in a spreadsheet: Excel workbook (a sheet per section, ten years by column, charts, links to the filings) · CSV. For a Google Sheet that stays up to date, paste =IMPORTDATA("https://tickdelta.com/company/CRL/export.csv") into a cell.