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CSGPCoStar Group

Real estate · Business Services · Nasdaq
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Earnings releases

Latest results release: Oct 27, 2026

8-K item 2.02, exhibit 99
Latest releaseRead ↓
Oct 27, 2026
CoStar Group Reports Record Third Quarter Revenue of $952 Million;
Releases kept
12
17 documents, oldest Feb 20, 2024
Adjusted EPS against GAAPEach quarter ↓
+111%
$0.38 adjusted, $0.18 GAAP, Oct 27, 2026

What CSGP's management wrote with each quarter's results: the press release 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.

In the company's own words

Adjusted vs GAAP earnings per share

Each release

In its release of 2026-10-27, CSGP reported $0.18 per share under GAAP and $0.38 on its own adjusted basis: the adjusted number is +111% above GAAP.

ReleaseGAAP EPSAdjusted EPSGap
Oct 27, 2026 0.18 0.38 +111%
Jul 28, 2026 0.01 0.32 +3100%
Apr 28, 2026 -0.04 0.23 –
Feb 24, 2026 0.11 0.31 +182%
Oct 28, 2025 -0.07 0.23 –
The company's words, latest release
Earnings per diluted share was $0.18 for the third quarter of 2026. release
Adjusted EPS was $0.38 in the third quarter, up 65% year-over-year. 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.

Read and search

Every release, in full

Linked to sec.gov
Press release Oct 27, 2026 · EX-99.1

CoStar Group Reports Record Third Quarter Revenue of $952 Million;

Open on SEC ↗

ARLINGTON, VA – October 27, 2026 - CoStar Group, Inc. (NASDAQ: CSGP), a leading global provider of online real estate marketplaces, information, analytics, and 3D digital twin technology in the property markets, announced today that revenue for the quarter ended September 30, 2026 was $952 million, up 14% over revenue of $834 million for the quarter ended September 30, 2025. Net new bookings were $37 million for the quarter.

Net income for the third quarter of 2026 was $74 million, up $105 million year- over-year. Earnings per diluted share was $0.18 for the third quarter of 2026. Adjusted Net Income rose to $153 million in the third quarter, up 59% year-over- year. Adjusted EPS was $0.38 in the third quarter, up 65% year-over-year. EBITDA was $179 million, up $166 million year-over-year. Adjusted EBITDA was $229 million in the third quarter of 2026, doubling from the prior year period.

“CoStar Group generated outstanding profitability growth in the third quarter, delivering on our commitment to expand margins as we exit a period of investment,” said Andy Florance, Founder and Chief Executive Officer of CoStar Group. “Adjusted EBITDA doubled year-over-year and was considerably above the high end of our $190 million to $210 million guidance range. We achieved significant additional efficiencies in the quarter, bringing total anticipated cost savings this year to approximately $150 million versus our original guidance. Our ongoing deep expense review has identified potential additional savings of at least $200 million that we believe will improve efficiency without sacrificing revenue growth. We expect to realize these over the next 12 to 18 months, keeping us on track to achieve our 2028 Adjusted EBITDA target of $1.25 billion.”

Florance continued, “We are demonstrating our ability to meaningfully grow profitability and are confident in our strategy to fuel future growth. We are leveraging AI and our proprietary ground truth data, giving us a unique competitive advantage in providing value to our information clients. Furthermore, our global scale enables us to deliver best-in-class consumer- facing AI functionality on our marketplaces at significantly lower costs than our competitors. Our acquisition of Zonda and agreement to acquire Vexcel demonstrate our ability to further enhance our proprietary datasets and global scale, which are real differentiators in the world of AI.”

The Company is increasing its Adjusted EBITDA guidance for the full year of 2026 to a range of $820 million to $840 million, which represents an increase of $30 million at the midpoint of the range from its guidance in July 2026, and a cumulative $60 million increase at the midpoint from its guidance in February 2026. For the fourth quarter of 2026, the Company expects Adjusted EBITDA in the range of $275 million to $295 million, representing a margin of 29% at the midpoint of the range.

The Company is increasing its revenue guidance for 2026 to a range of $3.75 billion to $3.77 billion, representing revenue growth of approximately 16% year- over-year at the midpoint of the range. The Company expects revenue for the fourth quarter of 2026 in the range of $976 million to $996 million, representing revenue growth of approximately 10% year-over-year at the midpoint of the range.

The Company is increasing its full year 2026 Adjusted EPS guidance in a range of $1.38 to $1.41 based on 405 million shares. For the fourth quarter of 2026, the Company expects Adjusted EPS in a range of $0.46 to $0.50 based on 400 million shares. These ranges include an estimated non-GAAP tax rate of 26% for the full year and the fourth quarter of 2026.

The preceding forward-looking statements reflect CoStar Group’s expectations as of October 27, 2026 , including forward-looking non-GAAP financial measures on a consolidated basis, based on current estimates, expectations, observations, and trends. Given the risk factors, rapidly evolving economic environment, and uncertainties and assumptions discussed in this release and in our quarterly reports on Form 10-Q and annual reports on Form 10-K, actual results may differ materially. Other than in publicly available statements, the Company does not intend to update its forward-looking statements until its next quarterly results announcement.

Reconciliations of EBITDA, Adjusted EBITDA, Adjusted Net Income, and Adjusted EPS to the most directly comparable GAAP measures are shown in detail below, along with definitions for those terms. A reconciliation of forward-looking non- GAAP guidance (except for 2028 Adjusted EBITDA guidance) to the most directly comparable GAAP measure, net income (loss), can be found within the tables included in this release. A reconciliation of the 2028 Adjusted EBITDA guidance to the most directly comparable GAAP measure is not available on a forward- looking basis without unreasonable effort due to the unknown effect, timing, and potential significance of certain income statement items.

For information regarding the purpose for which management uses the non-GAAP financial measures disclosed in this release and why management believes they provide useful information to investors regarding the Company’s financial condition and results of operations, please refer to the Company’s latest periodic report.

EBITDA is our net income (loss) before interest income or expense, net; other income or expense, net; income taxes; depreciation; and amortization. We typically disclose EBITDA on a consolidated and on an operating segment basis in our earnings releases, investor conference calls, and filings with the SEC.

Adjusted EBITDA is different from EBITDA because we further adjust EBITDA for stock-based compensation expense; acquisition- and integration-related costs; restructuring and related costs, including certain advisory fees; and settlements and impairments incurred outside our ordinary course of business, including judgments and related recoveries thereon. Adjusted EBITDA margin represents Adjusted EBITDA divided by revenue for the period.

Adjusted Net Income represents our net income (loss) adjusted for stock-based compensation expense; acquisition- and integration-related costs, including gains or losses on equity investments acquired in prospective targets and related to deal-contingent financial instruments; restructuring costs; settlement and impairment costs incurred outside our ordinary course of business, including judgments and related, non-recurring interest and recoveries thereon; and amortization of acquired intangible assets and other related costs, and then subtracting an assumed provision for income taxes. In 2026, we are assuming a 26% tax rate to approximate our statutory corporate tax rate, excluding the impact of discrete items, to determine Adjusted Net Income for each quarterly period, year-to-date period and annual period.

Adjusted EPS represents Adjusted Net Income divided by the number of diluted shares outstanding for the period used in the calculation of GAAP earnings per diluted share. For periods with GAAP net losses and Adjusted Net Income, the weighted average outstanding shares used to calculate Adjusted EPS includes potentially dilutive securities that were excluded from the calculation of GAAP earnings per share as the effect was anti-dilutive.

Net new bookings is calculated based on the annualized amount of change in the Company's sales bookings resulting from new subscription-based contracts, changes to existing subscription-based contracts, and cancellations of subscription-based contracts for the period reported. Information regarding net new bookings is not comparable to, nor should it be substituted for, an analysis of the Company's revenue over time.

Management will conduct a conference ca ll to discuss the third quart er 2026 results and the Company’s outlook at 5:00 PM ET on October 27, 2026 . A live audio webcast of the conference will be available in listen-only mode through the Investors section of the CoStar Group website: https://investors.costargroup.com. A replay of the webcast audio will also be available in the Investors section of our website for a period of time following the call.

CoStar Group, Inc. Condensed Consolidated Balance Sheets - Unaudited (in millions) ASSETS Current assets: September 30, 2026 December 31, 2025 ────────────────────────────────────────────────────────────────────────────── Cash and cash $ 500 $ 1,633 equivalents Restricted cash — 100 Accounts 316 263 receivable Less: Allowance -36 -29 for credit losses Accounts 280 234 receivable, net Income taxes 26 18 receivable Prepaid expenses and other current 140 134 assets Total current 946 2,119 assets Deferred income 8 47 taxes, net Property and 1,456 1,323 equipment, net Lease right-of-use 126 123 assets Goodwill 5,428 4,944 Intangible 2,062 1,771 assets, net Deferred commission costs, 188 184 net Deposits and 51 27 other assets Total assets $ 10,265 $ 10,538 LIABILITIES AND STOCKHOLDERS’ EQUITY Current liabilities: Accounts payable $ 56 $ 42 Accrued wages and 148 145 commissions Accrued expenses 199 203 Litigation — 99 accrual Lease liabilities 32 28 Deferred revenue 250 205 Other current 31 24 liabilities Total current 716 746 liabilities Long-term debt, 994 993 net Deferred income 335 238 taxes, net Income taxes 30 27 payable Lease and other long-term 198 163 liabilities Total liabilities 2,273 2,167 Stockholders' equity 7,975 8,334 attributable to CoStar Group Equity attributable to 17 37 noncontrolling interest Total equity 7,992 8,371 Total liabilities and stockholders' $ 10,265 $ 10,538 equity

CoStar Group, Inc. Condensed Consolidated Statements of Cash Flows - Unaudited Nine Months Ended (in millions) September 30, Operating activities: 2026 2025 ────────────────────────────────────────────────────────────────────────────── Net income (loss) $ 132 $ -40 Adjustments to reconcile net income (loss) to net cash provided by operating activities: Depreciation and amortization 265 182 Amortization of deferred commissions 93 110 costs Non-cash lease expense 23 22 Stock-based compensation 112 153 expense Deferred income taxes, net 40 6 Credit loss expense 25 26 Other operating activities, net 12 -6 Changes in operating assets and liabilities, net of acquisitions:

Accounts receivable -53 -32 Prepaid expenses, other current assets -12 -19 and other assets Deferred commissions -97 -117 Accounts payable and other -6 11 liabilities Litigation accrual -99 — Lease liabilities -4 -24 Income taxes payable, net -6 -21 Deferred revenue 30 17 Net cash provided by operating 455 268 activities Investing activities: Cash paid for acquisitions, net of cash -789 -2,347 acquired Purchases of property, equipment, and -134 -246 other assets for new campuses Purchase of equity securities — -285 Purchases of property, equipment, and -60 -77 other assets Proceeds from sale and settlement of 2 205 investments and other assets Net cash used in investing -981 -2,750 activities Financing activities: Repurchases of stock -668 -115 Repurchase of restricted stock to -24 -64 satisfy tax withholding obligations Proceeds from exercise of stock options 18 20 and employee stock purchase plan Purchase of noncontrolling -26 — interest Other financing activities, net -6 -3 Net cash used in financing -706 -162 activities Effect of foreign currency exchange rates on cash, cash -1 -2 equivalents, and restricted cash Net decrease in cash, cash equivalents, -1,233 -2,646 and restricted cash Cash, cash equivalents, and restricted 1,733 4,681 cash at the beginning of period Cash, cash equivalents, and restricted $ 500 $ 2,035 cash at the end of period

Reconc… of Forwar… Guidan… Guidance Net Range Guidan… Income For the Range to Three For the Adjust… Months December Year December EBITDA Ending 31, 2026 Ending 31, 2026 ────────────────────────────────────────────────────────────────────────────── Low High Low High Net $ 95 $ 109 $ 226 $ 241 income Amorti… of acquir… intang… 29 29 112 112 assets in cost of revenue Amorti… of acquir… intang… 48 48 166 166 assets in operat… expens… Deprec… and 24 24 78 78 other amorti… Intere… expense 4 4 -2 -2 (incom… net Other income, — — -1 -1 net Income tax 33 39 72 77 expens… net EBITDA 233 253 651 671 Stock-… compen… 40 40 152 152 expense Acquis… and integr… 2 2 28 28 related costs Restru… and — — 4 4 related costs Settle… and — — -15 -15 impair… Adjust… $ 275 $ 295 $ 820 $ 840 EBITDA… ______… (1)Tot… may not foot due to roundi…

CoStar Group, Inc. Reconcili… of Non-GAAP Financial Measures - Unaudited (in millions) Reconcili… of Net Income (Loss) to EBITDA and Adjusted EBITDA Three Nine Months Months Ended Ended September September 30, 30, 2026 2025 2026 2025 Net income $ 74 $ -31 $ 132 $ -40 (loss) Amortizat… of acquired intangible 29 19 83 47 assets in cost of revenue Amortizat… of acquired intangible 44 32 117 76 assets in operating expenses Depreciat… and other 22 13 54 39 amortizat… Interest (income) 1 -26 -7 -97 expense, net Other (income) -1 21 — 7 expense, net(1) Income tax expense, 10 -15 38 9 net EBITDA 179 13 417 41 Stock-bas… compensat… 32 71 112 153 expense Acquisiti… and integrati… 15 30 27 56 related costs Restructu… and — — 4 6 related costs Settlemen… and 3 — -15 9 impairmen… Adjusted $ 229 $ 114 $ 545 $ 265 EBITDA _________… (1)Includ… $3 million and $4 million of depreciat… and amortizat… expense, including above-mar… lease amortizat… associated with lessor activities for the three months ended September 30, 2026 and 2025, respectiv… and $11 million and $17 million for the nine months ended September 30, 2026 and 2025, respectiv…

CoStar Group, Inc. Results of Segments Three Nine - Months Months Unaudite… Ended Ended (in September September millions) 30, 30, EBITDA 2026 2025 2026 2025 ────────────────────────────────────────────────────────────────────────────── Commerci… Real $ 163 $ 114 $ 452 $ 335 Estate Resident… Real 16 -101 -35 -294 Estate Total $ 179 $ 13 $ 417 $ 41 EBITDA Adjusted EBITDA Commerci… Real $ 180 $ 183 $ 513 $ 495 Estate Resident… Real 49 -69 32 -230 Estate Total Adjusted $ 229 $ 114 $ 545 $ 265 EBITDA ________… (1)During the fourth quarter of 2025, we changed the composit… of our segments from geograph… to product portfoli… We have recast certain prior period disclosu… to align with new segments.

Rich Simonelli Head of Investor Relations CoStar Group Investor Relations (973) 896-8184

CoStar Group (NASDAQ: CSGP) is a leading global provider of online real estate marketplaces, information, analytics, and 3D digital twin technology in the property markets. Founded in 1986, CoStar Group is dedicated to digitizing the world’s real estate, empowering all people to discover properties, insights, and connections that improve their businesses and lives.

CoStar Group’s major brands include CoStar, a leading global provider of commercial real estate data, analytics, and news; LoopNet, the most trafficked commercial real estate marketplace; Apartments.com, the leading platform for apartment rentals; Homes.com, the fastest-growing residential real estate marketplace; and Domain, one of Australia’s leading property marketplaces. CoStar Group’s industry-leading brands also include Matterport, a leading spatial data company whose platform turns buildings into data to make every space more valuable and accessible; STR, a global leader in hospitality data and benchmarking; Zonda, a leading provider of data, analytics, software, and marketplace solutions for the residential construction industry; Ten-X, an online platform for commercial real estate auctions and negotiated bids; and OnTheMarket, a leading residential property portal in the United Kingdom.

CoStar Group’s websites attracted 121 million average monthly unique visitors in the third quarter of 2026, serving clients around the world. Headquartered in Arlington, Virginia, CoStar Group is committed to transforming the real estate industry through innovative technology and comprehensive market intelligence. From time to time, we plan to utilize our corporate website as a channel of distribution for material company information. For more information, visit CoStarGroup.com.

This news release and the Company’s earnings conference call contain “forward- looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements include, but are not limited to, statements about CoStar Group's plans, objectives, expectations, beliefs and intentions and other statements including words such as “hope,” “anticipate,” “may,” “likely,” “might,” “believe,” “expect,” “observe,” “consider,” “think,” “intend,” “envision,” “will,” “should,” “could,” “would,” “plan,” “target,” “goal,” “estimate,” “predict,” “continue,” “commit,” and “potential” or the negative of these terms or other comparable terminology. Such statements are based upon the current beliefs and expectations of management of CoStar Group and are subject to many risks and uncertainties. Actual results may differ materially from the results anticipated in the forward-looking statements and the assumptions and estimates used as a basis for the forward-looking statements. The following factors, among others, could cause or contribute to such differences: our inability to attract and retain new clients; our inability to successfully develop and introduce new or updated real estate information, analytics, and online marketplaces; the risks related to AI technologies, such as Homes Ai and Apartments Ai; the planned CoStar Ai launch may be delayed or changed; our inability to compete successfully against existing or future competitors in attracting advertisers and in general; the effects of fluctuations and market cyclicality; the effects of global economic uncertainties and downturns or a downturn or consolidation in the real estate industry; our inability to hire qualified persons for, or retain and continue to develop, our sales force, or unproductivity of our sales force; our inability to retain and attract highly capable management and operating personnel; the downward pressure that our internal and external investments may place on our operating margins; our inability to increase brand awareness; our inability to maintain or increase internet traffic to our marketplaces, and the risk that the methods, including Google Analytics, that we use to measure average monthly unique visitors to our portals may misstate the actual number of unique persons who visit our network of mobile applications and websites for a given month or may differ from the methods used by competitors; our inability to attract new advertisers; our inability to successfully identify, finance, integrate, and/or manage costs related to acquisitions; our inability to complete certain strategic transactions if a proposed transaction is subject to review or approval by regulatory authorities pursuant to applicable laws or regulations; our inability to realize the benefits of the acquisitions of Matterport, LLC ("Matterport"), Domain Holdings Australia Pty Limited, or Bora Inc. and its subsidiaries ("Zonda"), or to complete the acquisition of Vexcel Group, Inc. and its subsidiaries ("Vexcel") in a timely manner, or at all, or realize the expected benefits of the Vexcel acquisition; the inability of third-party suppliers upon which Matterport relies to fulfill its needs; the effects of cyberattacks and security vulnerabilities, and technical problems or disruptions; the significant costs associated with undertaking a large infrastructure project; our inability to generate increased revenue from our current or future geographic expansion plans; the risks related to acceptance of credit cards and debit cards and facilitation of other customer payments; the effects of climate-related events and other events beyond our control; the effects related to attention to climate-related risks and opportunities; our inability to obtain and maintain accurate, comprehensive, or reliable data; our inability to obtain and maintain stable data feeds, or disruption of our data feeds; our inability to enforce or defend our ownership and use of intellectual property; the effects of use of new and evolving technologies, including artificial intelligence, on our ability to protect our data and intellectual property from misappropriation by third parties; our inability to defend against potential legal liability for collecting, displaying, or distributing information; our inability to obtain or retain listings from real estate brokers, agents, property owners, and apartment property managers; our inability to maintain or establish relationships with third-party listing providers;

our inability to comply with the rules and compliance requirements of Multiple Listing Services; the risks related to open source software; the risks related to international operations; the effects of foreign currency exchange rate fluctuations; our indebtedness; the effects of a lowering or withdrawal of the ratings assigned to our debt securities by rating agencies; the effects of any actual or perceived failure to comply with privacy or data protection laws, regulations, or standards; the effects of changes in tax laws, regulations, or fiscal and tax policies; the effects of third-party claims, litigation, regulatory proceedings, or government investigations; the risks related to return on investment; and the risks related to the specific timing, price, and size of repurchases under the Stock Repurchase Program, including that the Stock Repurchase Program may be suspended or discontinued at any time at the Company’s discretion. More information about potential factors that could cause results to differ materially from those anticipated in the forward-looking statements include, but are not limited to, those stated in CoStar Group’s filings from time to time with the Securities and Exchange Commission (the "SEC"), including in CoStar Group’s Annual Reports on Form 10-K and Quarterly Reports on Form 10-Q, each of which is filed with the SEC, including in the “Risk Factors” section of those filings, as well as CoStar Group’s other filings with the SEC (including Current Reports on Form 8-K) available at the SEC’s website (www.sec.gov). All forward-looking statements are based on information available to CoStar Group on the date hereof, and CoStar Group assumes no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by applicable law.

Full text with the tables
                                                                                
  Exhibit 99.1                                                                  
                                                                                
       CoStar Group Reports Record Third Quarter Revenue of $952 Million;       
                                                                                
              Profitability Surges with Net Income of $74 Million;              
                                                                                
     Highest Ever Adjusted EBITDA of $229 Million, Doubling Year-over-Year;     
                                                                                
                 Raises Full-Year 2026 Adjusted EBITDA Guidance                 
                                                                                
ARLINGTON, VA – October 27, 2026 - CoStar Group, Inc. (NASDAQ: CSGP), a leading
global provider of online real estate marketplaces, information, analytics, and
3D digital twin technology in the property markets, announced today that revenue
for the quarter ended September 30, 2026 was $952 million, up 14% over revenue
of $834 million for the quarter ended September 30, 2025. Net new bookings were
$37 million for the quarter.

Net income for the third quarter of 2026 was $74 million, up $105 million year-
over-year. Earnings per diluted share was $0.18 for the third quarter of 2026.
Adjusted Net Income rose to $153 million in the third quarter, up 59% year-over-
year. Adjusted EPS was $0.38 in the third quarter, up 65% year-over-year. EBITDA
was $179 million, up $166 million year-over-year. Adjusted EBITDA was $229
million in the third quarter of 2026, doubling from the prior year period.

“CoStar Group generated outstanding profitability growth in the third quarter,
delivering on our commitment to expand margins as we exit a period of
investment,” said Andy Florance, Founder and Chief Executive Officer of CoStar
Group. “Adjusted EBITDA doubled year-over-year and was considerably above the
high end of our $190 million to $210 million guidance range. We achieved
significant additional efficiencies in the quarter, bringing total anticipated
cost savings this year to approximately $150 million versus our original
guidance. Our ongoing deep expense review has identified potential additional
savings of at least $200 million that we believe will improve efficiency without
sacrificing revenue growth. We expect to realize these over the next 12 to 18
months, keeping us on track to achieve our 2028 Adjusted EBITDA target of $1.25
billion.”

Florance continued, “We are demonstrating our ability to meaningfully grow
profitability and are confident in our strategy to fuel future growth. We are
leveraging AI and our proprietary ground truth data, giving us a unique
competitive advantage in providing value to our information clients.
Furthermore, our global scale enables us to deliver best-in-class consumer-
facing AI functionality on our marketplaces at significantly lower costs than
our competitors. Our acquisition of Zonda and agreement to acquire Vexcel
demonstrate our ability to further enhance our proprietary datasets and global
scale, which are real differentiators in the world of AI.”
                                                                                
  Year                                                                          
  2025-2026                                                                     
  Quarterly                                                                     
  Results -                                                                     
  Unaudited                                                                     
  (in                                                                           
  millions,                                                                     
  except                                                                        
  per share                                                                     
  data)                                                                         
                  2025                                  2026                    
                    Q1       Q2         Q3       Q4       Q1       Q2       Q3  
  Revenue         $732     $781       $834     $900     $897     $925     $952  
  Net                                                                           
  income         $(15)       $6      $(31)      $47       $3      $55      $74  
  (loss)                                                                        
  Earnings                                                                      
  per share    $(0.04)    $0.01    $(0.07)    $0.11    $0.01    $0.14    $0.18  
  - diluted                                                                     
  Weighted…                                                                     
  outstand…        411      424        420      420      414      404      402  
  shares -                                                                      
  diluted                                                                       
  EBITDA          $(1)      $29        $13     $129      $81     $157     $179  
  Adjusted         $66      $85       $114     $177     $132     $184     $229  
  EBITDA                                                                        
  Adjusted                                                                      
  Net              $63      $74        $96     $131      $94     $128     $153  
  Income                                                                        
  Adjusted       $0.15    $0.17      $0.23    $0.31    $0.23    $0.32    $0.38  
  EPS                                                                           
                                                                                
                                                                                
  2026 Outlook                                                                  
                                                                                
The Company is increasing its Adjusted EBITDA guidance for the full year of 2026
to a range of $820 million to $840 million, which represents an increase of $30
million at the midpoint of the range from its guidance in July 2026, and a
cumulative $60 million increase at the midpoint from its guidance in February
2026. For the fourth quarter of 2026, the Company expects Adjusted EBITDA in the
range of $275 million to $295 million, representing a margin of 29% at the
midpoint of the range.

The Company is increasing its revenue guidance for 2026 to a range of $3.75
billion to $3.77 billion, representing revenue growth of approximately 16% year-
over-year at the midpoint of the range. The Company expects revenue for the
fourth quarter of 2026 in the range of $976 million to $996 million,
representing revenue growth of approximately 10% year-over-year at the midpoint
of the range.

The Company is increasing its full year 2026 Adjusted EPS guidance in a range of
$1.38 to $1.41 based on 405 million shares. For the fourth quarter of 2026, the
Company expects Adjusted EPS in a range of $0.46 to $0.50 based on 400 million
shares. These ranges include an estimated non-GAAP tax rate of 26% for the full
year and the fourth quarter of 2026.

The preceding forward-looking statements reflect CoStar Group’s expectations as
of October 27, 2026 , including forward-looking non-GAAP financial measures on a
consolidated basis, based on current estimates, expectations, observations, and
trends. Given the risk factors, rapidly evolving economic environment, and
uncertainties and assumptions discussed in this release and in our quarterly
reports on Form 10-Q and annual reports on Form 10-K, actual results may differ
materially. Other than in publicly available statements, the Company does not
intend to update its forward-looking statements until its next quarterly results
announcement.

Reconciliations of EBITDA, Adjusted EBITDA, Adjusted Net Income, and Adjusted
EPS to the most directly comparable GAAP measures are shown in detail below,
along with definitions for those terms. A reconciliation of forward-looking non-
GAAP guidance (except for 2028 Adjusted EBITDA guidance) to the most directly
comparable GAAP measure, net income (loss), can be found within the tables
included in this release. A reconciliation of the 2028 Adjusted EBITDA guidance
to the most directly comparable GAAP measure is not available on a forward-
looking basis without unreasonable effort due to the unknown effect, timing, and
potential significance of certain income statement items.
                                                                                
  Non-GAAP Financial Measures                                                   
                                                                                
For information regarding the purpose for which management uses the non-GAAP
financial measures disclosed in this release and why management believes they
provide useful information to investors regarding the Company’s financial
condition and results of operations, please refer to the Company’s latest
periodic report.

EBITDA is our net income (loss) before interest income or expense, net; other
income or expense, net; income taxes; depreciation; and amortization. We
typically disclose EBITDA on a consolidated and on an operating segment basis in
our earnings releases, investor conference calls, and filings with the SEC.

Adjusted EBITDA is different from EBITDA because we further adjust EBITDA for
stock-based compensation expense; acquisition- and integration-related costs;
restructuring and related costs, including certain advisory fees; and
settlements and impairments incurred outside our ordinary course of business,
including judgments and related recoveries thereon. Adjusted EBITDA margin
represents Adjusted EBITDA divided by revenue for the period.

Adjusted Net Income represents our net income (loss) adjusted for stock-based
compensation expense; acquisition- and integration-related costs, including
gains or losses on equity investments acquired in prospective targets and
related to deal-contingent financial instruments; restructuring costs;
settlement and impairment costs incurred outside our ordinary course of
business, including judgments and related, non-recurring interest and recoveries
thereon; and amortization of acquired intangible assets and other related costs,
and then subtracting an assumed provision for income taxes. In 2026, we are
assuming a 26% tax rate to approximate our statutory corporate tax rate,
excluding the impact of discrete items, to determine Adjusted Net Income for
each quarterly period, year-to-date period and annual period.

Adjusted EPS represents Adjusted Net Income divided by the number of diluted
shares outstanding for the period used in the calculation of GAAP earnings per
diluted share. For periods with GAAP net losses and Adjusted Net Income, the
weighted average outstanding shares used to calculate Adjusted EPS includes
potentially dilutive securities that were excluded from the calculation of GAAP
earnings per share as the effect was anti-dilutive.
                                                                                
  Operating Metrics                                                             
                                                                                
Net new bookings is calculated based on the annualized amount of change in the
Company's sales bookings resulting from new subscription-based contracts,
changes to existing subscription-based contracts, and cancellations of
subscription-based contracts for the period reported. Information regarding net
new bookings is not comparable to, nor should it be substituted for, an analysis
of the Company's revenue over time.
                                                                                
  Earnings Conference Call                                                      
                                                                                
Management will conduct a conference ca ll to discuss the third quart er 2026
results and the Company’s outlook at 5:00 PM ET on October 27, 2026 . A live
audio webcast of the conference will be available in listen-only mode through
the Investors section of the CoStar Group website:
https://investors.costargroup.com. A replay of the webcast audio will also be
available in the Investors section of our website for a period of time following
the call.
                                                                                
  CoStar                                                                        
  Group,                                                                        
  Inc.                                                                          
  Conden…                                                                       
  Consol…                                                                       
  Statem…                                                                       
  of                                                                            
  Operat…                                                                       
  -                                                                             
  Unaudi…                                                                       
  (in                                                                           
  millio…                                                                       
  except                                                                        
  per                                                                           
  share                                                                         
  data)                                                                         
                 Three                              Nine                        
                Months                            Months                        
                 Ended                             Ended                        
             September                          Septemb…                        
                   30,                               30,                        
                  2026           2025               2026           2025         
  Revenue            $    952       $    834           $  2,774       $  2,347  
  Cost of                 211            172                604            493  
  revenue                                                                       
  Gross                   741            662              2,170          1,854  
  profit                                                                        
  Operat…                                                                       
  expens…                                                                       
  Selling                                                                       
  and                                                                           
  market…                                                                       
  (exclu…                 366            418              1,182          1,182  
  custom…                                                                       
  base                                                                          
  amorti…                                                                       
  Softwa…                 109            106                330            297  
  develo…                                                                       
  General                                                                       
  and                     138            157                378            420  
  admini…                                                                       
  Custom…                                                                       
  base                     44             32                117             76  
  amorti…                                                                       
                          657            713              2,007          1,975  
  Income                                                                        
  (loss)                   84            -51                163           -121  
  from                                                                          
  operat…                                                                       
  Intere…                                                                       
  income                   -1             26                  7             97  
  (expen…                                                                       
  net                                                                           
  Other                                                                         
  income                    1            -21                  —             -7  
  (expen…                                                                       
  net                                                                           
  Income                                                                        
  (loss)                                                                        
  before                   84            -46                170            -31  
  income                                                                        
  taxes                                                                         
  Income                                                                        
  tax                      10            -15                 38              9  
  expense                                                                       
  (benef…                                                                       
  Net                                                                           
  income             $     74       $    -31           $    132       $    -40  
  (loss)                                                                        
  Earnin…                                                                       
  per                $   0.18       $  -0.07           $   0.32       $  -0.09  
  share -                                                                       
  basic                                                                         
  Earnin…                                                                       
  per                $   0.18       $  -0.07           $   0.32       $  -0.09  
  share -                                                                       
  diluted                                                                       
  Weight…                                                                       
  outsta…                                                                       
  shares                401.6          419.9              406.2          416.7  
  -                                                                             
  basic                                                                         
  Weight…                                                                       
  outsta…                                                                       
  shares                401.9          419.9              406.7          416.7  
  -                                                                             
  diluted                                                                       
                                                                                
                                                                                
  CoStar Group,                                                                 
  Inc.                                                                          
  Condensed                                                                     
  Consolidated                                                                  
  Balance Sheets -                                                              
  Unaudited                                                                     
  (in millions)                                                                 
  ASSETS                                                                        
  Current assets:      September 30, 2026            December 31, 2025          
 ────────────────────────────────────────────────────────────────────────────── 
  Cash and cash        $                      500    $                   1,633  
  equivalents                                                                   
  Restricted cash                               —                          100  
  Accounts                                    316                          263  
  receivable                                                                    
  Less: Allowance                             -36                          -29  
  for credit losses                                                             
  Accounts                                    280                          234  
  receivable, net                                                               
  Income taxes                                 26                           18  
  receivable                                                                    
  Prepaid expenses                                                              
  and other current                           140                          134  
  assets                                                                        
  Total current                               946                        2,119  
  assets                                                                        
  Deferred income                               8                           47  
  taxes, net                                                                    
  Property and                              1,456                        1,323  
  equipment, net                                                                
  Lease                                                                         
  right-of-use                                126                          123  
  assets                                                                        
  Goodwill                                  5,428                        4,944  
  Intangible                                2,062                        1,771  
  assets, net                                                                   
  Deferred                                                                      
  commission costs,                           188                          184  
  net                                                                           
  Deposits and                                 51                           27  
  other assets                                                                  
  Total assets         $                   10,265    $                  10,538  
  LIABILITIES AND                                                               
  STOCKHOLDERS’                                                                 
  EQUITY                                                                        
  Current                                                                       
  liabilities:                                                                  
  Accounts payable     $                       56    $                      42  
  Accrued wages and                           148                          145  
  commissions                                                                   
  Accrued expenses                            199                          203  
  Litigation                                    —                           99  
  accrual                                                                       
  Lease liabilities                            32                           28  
  Deferred revenue                            250                          205  
  Other current                                31                           24  
  liabilities                                                                   
  Total current                               716                          746  
  liabilities                                                                   
  Long-term debt,                             994                          993  
  net                                                                           
  Deferred income                             335                          238  
  taxes, net                                                                    
  Income taxes                                 30                           27  
  payable                                                                       
  Lease and other                                                               
  long-term                                   198                          163  
  liabilities                                                                   
  Total liabilities                         2,273                        2,167  
  Stockholders'                                                                 
  equity                                    7,975                        8,334  
  attributable to                                                               
  CoStar Group                                                                  
  Equity                                                                        
  attributable to                              17                           37  
  noncontrolling                                                                
  interest                                                                      
  Total equity                              7,992                        8,371  
  Total liabilities                                                             
  and stockholders'    $                   10,265    $                  10,538  
  equity                                                                        
                                                                                
                                                                                
  CoStar Group, Inc.                                                            
  Condensed Consolidated                                                        
  Statements of Cash Flows -                                                    
  Unaudited                          Nine Months Ended                          
  (in millions)                      September 30,                              
  Operating activities:              2026                         2025          
 ────────────────────────────────────────────────────────────────────────────── 
  Net income (loss)                  $                     132    $        -40  
  Adjustments to reconcile net                                                  
  income                                                                        
  (loss) to net cash provided by                                                
  operating                                                                     
  activities:                                                                   
  Depreciation and amortization                            265             182  
  Amortization of deferred                                                      
  commissions                                               93             110  
  costs                                                                         
  Non-cash lease expense                                    23              22  
  Stock-based compensation                                 112             153  
  expense                                                                       
  Deferred income taxes, net                                40               6  
  Credit loss expense                                       25              26  
  Other operating activities, net                           12              -6  
  Changes in operating assets and                                               
  liabilities, net of                                                           
  acquisitions:                                                                 
                                                                                
  Accounts receivable                                      -53             -32  
  Prepaid expenses, other current                                               
  assets                                                   -12             -19  
  and other assets                                                              
  Deferred commissions                                     -97            -117  
  Accounts payable and other                                -6              11  
  liabilities                                                                   
  Litigation accrual                                       -99               —  
  Lease liabilities                                         -4             -24  
  Income taxes payable, net                                 -6             -21  
  Deferred revenue                                          30              17  
  Net cash provided by operating                           455             268  
  activities                                                                    
  Investing activities:                                                         
  Cash paid for acquisitions, net                                               
  of cash                                                 -789          -2,347  
  acquired                                                                      
  Purchases of property,                                                        
  equipment, and                                          -134            -246  
  other assets for new campuses                                                 
  Purchase of equity securities                              —            -285  
  Purchases of property,                                                        
  equipment, and                                           -60             -77  
  other assets                                                                  
  Proceeds from sale and                                                        
  settlement of                                              2             205  
  investments and other assets                                                  
  Net cash used in investing                              -981          -2,750  
  activities                                                                    
  Financing activities:                                                         
  Repurchases of stock                                    -668            -115  
  Repurchase of restricted stock                                                
  to                                                       -24             -64  
  satisfy tax withholding                                                       
  obligations                                                                   
  Proceeds from exercise of stock                                               
  options                                                   18              20  
  and employee stock purchase                                                   
  plan                                                                          
  Purchase of noncontrolling                               -26               —  
  interest                                                                      
  Other financing activities, net                           -6              -3  
  Net cash used in financing                              -706            -162  
  activities                                                                    
  Effect of foreign currency                                                    
  exchange                                                                      
  rates on cash, cash                                       -1              -2  
  equivalents, and                                                              
  restricted cash                                                               
  Net decrease in cash, cash                                                    
  equivalents,                                          -1,233          -2,646  
  and restricted cash                                                           
  Cash, cash equivalents, and                                                   
  restricted                                             1,733           4,681  
  cash at the beginning of period                                               
  Cash, cash equivalents, and                                                   
  restricted                         $                     500    $      2,035  
  cash at the end of period                                                     
                                                                                
                                                                                
  CoStar                                                                        
  Group,                                                                        
  Inc.                                                                          
  Disaggre…                                                                     
  Revenue -                                                                     
  Unaudited    Three                          Nine                              
  (in          Months                         Months                            
  millions)    Ended                          Ended                             
  Commerci…    September                      September                         
  Real         30,                            30,                               
  Estate       2026              2025         2026                 2025         
 ────────────────────────────────────────────────────────────────────────────── 
  CoStar       $          344    $     318    $           1,012    $       933  
  LoopNet                  89           79                  261            228  
  Other                                                                         
  Commerci…                59           64                  172            155  
  Real                                                                          
  Estate                                                                        
  Total                                                                         
  Commerci…               492          461                1,445          1,316  
  Real                                                                          
  Estate                                                                        
  Resident…                                                                     
  Real                    460          373                1,329          1,031  
  Estate                                                                        
  Total        $          952    $     834    $           2,774    $     2,347  
  revenue                                                                       
                                                                                
                                                                                
  C…                                                                            
  G…                                                                            
  I…                                                                            
  D…                                                                            
  R…                                                                            
  -                                                                             
  U…                                                                            
  (…                                                                            
  m…                                                                            
  C…                                                                            
  R…    2…                                        20…                           
  E…    Q1         Q2        Q3         Q4        Q1         Q2         Q3      
 ────────────────────────────────────────────────────────────────────────────── 
  C…    $   305    $   3…    $   318    $   3…    $    3…    $   337    $   3…  
  L…         73        76         79        84         85         87        89  
  O…                                                                            
  C…         31        60         64        62         56         57        59  
  R…                                                                            
  E…                                                                            
  T…                                                                            
  C…        409        4…        461        4…         4…        481        4…  
  R…                                                                            
  E…                                                                            
  R…                                                                            
  R…        323        3…        373        4…         4…        444        4…  
  E…                                                                            
  T…    $   732    $   7…    $   834    $   9…    $    8…    $   925    $   9…  
  r…                                                                            
                                                                                
                                                                                
  CoS…                                                                          
  Gro…                                                                          
  Inc.                                                                          
  Rec…                                                                          
  of                                                                            
  For…                                                                          
  Gui…                                                                          
  -                                                                             
  Una…                                                                          
  (in                                                                           
  mil…                                                                          
  exc…                                                                          
  per                                                                           
  sha…                                                                          
  dat…                                                                          
  Rec…                                                                          
  of                                                                            
  For…    Guid…                                                                 
  Gui…    Range                                Gui…                             
  Net     For                                  Ran…                             
  Inc…    the                                  For                              
  to      Three                                the                              
  Adj…    Mont…                                Year                             
  Net     Endi…                                End…                             
  Inc…    Dece…                                Dec…                             
  and     31,                                  31,                              
  Adj…    2026                                 2026                             
  EPS     Low                High              Low               High           
 ────────────────────────────────────────────────────────────────────────────── 
  Net     $         95       $       109       $       226       $      241     
  inc…                                                                          
  Inc…                                                                          
  tax               33                39                72               77     
  exp…                                                                          
  Inc…                                                                          
  bef…             128               148               298              318     
  inc…                                                                          
  tax…                                                                          
  Amo…                                                                          
  of                                                                            
  acq…              77                77               278              278     
  int…                                                                          
  ass…                                                                          
  Sto…                                                                          
  com…              40                40               152              152     
  exp…                                                                          
  Acq…                                                                          
  and                                                                           
  int…               2                 2                28               28     
  rel…                                                                          
  cos…                                                                          
  Int…                                                                          
  rel…               —                 —                 9                9     
  to                                                                            
  set…                                                                          
  Res…                                                                          
  and                —                 —                 4                4     
  rel…                                                                          
  cos…                                                                          
  Set…                                                                          
  and                —                 —               -15              -15     
  imp…                                                                          
  Adj…                                                                          
  inc…                                                                          
  bef…             247               267               754              774     
  inc…                                                                          
  tax…                                                                          
  Ass…                                                                          
  rate                                                                          
  for               26  %             26  %             26  %            26  %  
  inc…                                                                          
  tax                                                                           
  exp…                                                                          
  Ass…                                                                          
  pro…                                                                          
  for              -64               -69              -196             -201     
  inc…                                                                          
  tax                                                                           
  exp…                                                                          
  Adj…                                                                          
  Net     $        183       $       198       $       558       $      573     
  Inc…                                                                          
  Ear…                                                                          
  per                                                                           
  sha…    $       0.24       $      0.27       $      0.56       $     0.60     
  -                                                                             
  dil…                                                                          
  Adj…    $       0.46       $      0.50       $      1.38       $     1.41     
  EPS                                                                           
  Adj…                                                                          
  wei…                                                                          
  ave…                                                                          
  out…           400.0             400.0             405.0             405…     
  sha…                                                                          
  -                                                                             
  dil…                                                                          
  ___…                                                                          
  (1)…                                                                          
  ass…                                                                          
  tax                                                                           
  rate                                                                          
  app…                                                                          
  our                                                                           
  sta…                                                                          
  fed…                                                                          
  and                                                                           
  sta…                                                                          
  cor…                                                                          
  tax                                                                           
  rate                                                                          
  for                                                                           
  the                                                                           
  app…                                                                          
  per…                                                                          
                                                                                
                                                                                
  Reconc…                                                                       
  of                                                                            
  Forwar…                                                                       
  Guidan…    Guidance                                                           
  Net        Range                              Guidan…                         
  Income     For the                            Range                           
  to         Three                              For the                         
  Adjust…    Months    December                 Year     December               
  EBITDA     Ending    31, 2026                 Ending   31, 2026               
 ────────────────────────────────────────────────────────────────────────────── 
             Low                   High         Low                  High       
  Net        $               95    $     109    $             226    $     241  
  income                                                                        
  Amorti…                                                                       
  of                                                                            
  acquir…                                                                       
  intang…                    29           29                  112          112  
  assets                                                                        
  in cost                                                                       
  of                                                                            
  revenue                                                                       
  Amorti…                                                                       
  of                                                                            
  acquir…                                                                       
  intang…                    48           48                  166          166  
  assets                                                                        
  in                                                                            
  operat…                                                                       
  expens…                                                                       
  Deprec…                                                                       
  and                        24           24                   78           78  
  other                                                                         
  amorti…                                                                       
  Intere…                                                                       
  expense                     4            4                   -2           -2  
  (incom…                                                                       
  net                                                                           
  Other                                                                         
  income,                     —            —                   -1           -1  
  net                                                                           
  Income                                                                        
  tax                        33           39                   72           77  
  expens…                                                                       
  net                                                                           
  EBITDA                    233          253                  651          671  
  Stock-…                                                                       
  compen…                    40           40                  152          152  
  expense                                                                       
  Acquis…                                                                       
  and                                                                           
  integr…                     2            2                   28           28  
  related                                                                       
  costs                                                                         
  Restru…                                                                       
  and                         —            —                    4            4  
  related                                                                       
  costs                                                                         
  Settle…                                                                       
  and                         —            —                  -15          -15  
  impair…                                                                       
  Adjust…    $              275    $     295    $             820    $     840  
  EBITDA…                                                                       
  ______…                                                                       
  (1)Tot…                                                                       
  may not                                                                       
  foot                                                                          
  due to                                                                        
  roundi…                                                                       
                                                                                
                                                                                
             Guidance                                                           
             Range                              Guidan…                         
             For the                            Range                           
             Three                              For the                         
             Months    December                 Year     December               
             Ending    31, 2026                 Ending   31, 2026               
 ────────────────────────────────────────────────────────────────────────────── 
             Low                   High         Low                  High       
  EBITDA                                                                        
  Commer…                                                                       
  Real       $              151    $     161    $             604    $     614  
  Estate                                                                        
  Reside…                                                                       
  Real                       82           92                   47           57  
  Estate                                                                        
  Total      $              233    $     253    $             651    $     671  
  EBITDA                                                                        
  Adjust…                                                                       
  EBITDA                                                                        
  Commer…                                                                       
  Real       $              177    $     187    $             690    $     700  
  Estate                                                                        
  Reside…                                                                       
  Real                       98          108                  130          140  
  Estate                                                                        
  Total                                                                         
  Adjust…    $              275    $     295    $             820    $     840  
  EBITDA                                                                        
                                                                                
                                                                                
  CoS…                                                                          
  Gro…                                                                          
  Inc.                                                                          
  Rec…                                                                          
  of                                                                            
  Non…                                                                          
  Fin…                                                                          
  Mea…                                                                          
  -                                                                             
  Una…                                                                          
  (in                                                                           
  mil…                                                                          
  exc…                                                                          
  per                                                                           
  sha…                                                                          
  dat…                                                                          
  Rec…                                                                          
  of                                                                            
  Net                                                                           
  Inc…                                                                          
  (Lo…                                                                          
  to                                                                            
  Adj…                                                                          
  Net                                                                           
  Inc…                                                                          
  and                                                                           
  Adj…                                                                          
  EPS                                                                           
          Three                                Nine                             
          Mont…                                Mon…                             
          Ended                                End…                             
          Sept…                                Sep…                             
            30,                                 30,                             
           2026              2025              2026              2025           
  Net                                                                           
  inc…        $     74          $    -31          $    132          $   -40     
  (lo…                                                                          
  Inc…                                                                          
  tax               10               -15                38                9     
  exp…                                                                          
  (be…                                                                          
  Inc…                                                                          
  (lo…                                                                          
  bef…              84               -46               170              -31     
  inc…                                                                          
  tax…                                                                          
  Amo…                                                                          
  of                                                                            
  acq…              73                51               200              123     
  int…                                                                          
  ass…                                                                          
  Sto…                                                                          
  com…              32                71               112              153     
  exp…                                                                          
  Acq…                                                                          
  and                                                                           
  int…                                                                          
  rel…                                                                          
  cos…                                                                          
  inc…              15                30                27               56     
  in                                                                            
  inc…                                                                          
  (lo…                                                                          
  from                                                                          
  ope…                                                                          
  (Ga…                                                                          
  los…                                                                          
  on                                                                            
  inv…                                                                          
  and                                                                           
  dea…                                                                          
  for…               —                23                 —               -2     
  cur…                                                                          
  for…                                                                          
  con…                                                                          
  rel…                                                                          
  to                                                                            
  an                                                                            
  acq…                                                                          
  Int…                                                                          
  rel…               —                 —                 9                —     
  to                                                                            
  set…                                                                          
  Res…                                                                          
  and                —                 —                 4                6     
  rel…                                                                          
  cos…                                                                          
  Set…                                                                          
  and                3                 —               -15                9     
  imp…                                                                          
  Adj…                                                                          
  inc…                                                                          
  bef…             207               129               507              314     
  inc…                                                                          
  tax…                                                                          
  Ass…                                                                          
  rate                                                                          
  for               26  %             26  %             26  %            26  %  
  inc…                                                                          
  tax                                                                           
  exp…                                                                          
  Ass…                                                                          
  pro…                                                                          
  for              -54               -33              -132              -81     
  inc…                                                                          
  tax                                                                           
  exp…                                                                          
  Adj…                                                                          
  Net         $    153          $     96          $    375          $   233     
  Inc…                                                                          
  Ear…                                                                          
  per                                                                           
  sha…        $   0.18          $  -0.07          $   0.32          $  -0.…     
  -                                                                             
  dil…                                                                          
  Adj…        $   0.38          $   0.23          $   0.92          $  0.55     
  EPS                                                                           
  Wei…                                                                          
  out…                                                                          
  sha…           401.6             419.9             406.2             416…     
  -                                                                             
  bas…                                                                          
  Wei…                                                                          
  out…                                                                          
  sha…           401.9             419.9             406.7             416…     
  -                                                                             
  dil…                                                                          
  Adj…                                                                          
  dil…               —               3.4                 —              4.3     
  sha…                                                                          
  Adj…                                                                          
  wei…                                                                          
  ave…           401.9             423.3             406.7             421…     
  sha…                                                                          
  dil…                                                                          
  ___…                                                                          
  (1)…                                                                          
  in                                                                            
  oth…                                                                          
  exp…                                                                          
  net                                                                           
  in                                                                            
  the                                                                           
  con…                                                                          
  con…                                                                          
  sta…                                                                          
  of                                                                            
  ope…                                                                          
  (2)…                                                                          
  ass…                                                                          
  tax                                                                           
  rate                                                                          
  app…                                                                          
  our                                                                           
  sta…                                                                          
  fed…                                                                          
  and                                                                           
  sta…                                                                          
  cor…                                                                          
  tax                                                                           
  rate                                                                          
  for                                                                           
  the                                                                           
  app…                                                                          
  per…                                                                          
  (3)…                                                                          
  the                                                                           
  eff…                                                                          
  of                                                                            
  pot…                                                                          
  com…                                                                          
  sha…                                                                          
  such                                                                          
  as                                                                            
  the                                                                           
  Com…                                                                          
  sto…                                                                          
  opt…                                                                          
  res…                                                                          
  sto…                                                                          
  uni…                                                                          
  and                                                                           
  def…                                                                          
  sto…                                                                          
  uni…                                                                          
  to                                                                            
  the                                                                           
  ext…                                                                          
  the                                                                           
  eff…                                                                          
  is                                                                            
  dil…                                                                          
  In                                                                            
  per…                                                                          
  with                                                                          
  a                                                                             
  net                                                                           
  loss                                                                          
  ava…                                                                          
  to                                                                            
  com…                                                                          
  sto…                                                                          
  the                                                                           
  ant…                                                                          
  eff…                                                                          
  of                                                                            
  the…                                                                          
  pot…                                                                          
  com…                                                                          
  sha…                                                                          
  is                                                                            
  exc…                                                                          
  and                                                                           
  ear…                                                                          
  per                                                                           
  sha…                                                                          
  -                                                                             
  dil…                                                                          
  is                                                                            
  equ…                                                                          
  to                                                                            
  ear…                                                                          
  per                                                                           
  sha…                                                                          
  -                                                                             
  bas…                                                                          
  Adj…                                                                          
  wei…                                                                          
  ave…                                                                          
  sha…                                                                          
  have                                                                          
  been                                                                          
  adj…                                                                          
  for                                                                           
  the…                                                                          
  per…                                                                          
  to                                                                            
  inc…                                                                          
  the                                                                           
  dil…                                                                          
  imp…                                                                          
                                                                                
                                                                                
  CoStar                                                                        
  Group,                                                                        
  Inc.                                                                          
  Reconcili…                                                                    
  of                                                                            
  Non-GAAP                                                                      
  Financial                                                                     
  Measures -                                                                    
  Unaudited                                                                     
  (in                                                                           
  millions)                                                                     
  Reconcili…                                                                    
  of Net                                                                        
  Income                                                                        
  (Loss) to                                                                     
  EBITDA and                                                                    
  Adjusted                                                                      
  EBITDA                                                                        
                      Three                      Nine Months                    
                     Months                            Ended                    
                      Ended                        September                    
                  September                              30,                    
                        30,                                                     
                       2026         2025                2026         2025       
  Net income              $   74       $  -31              $  132       $  -40  
  (loss)                                                                        
  Amortizat…                                                                    
  of                                                                            
  acquired                                                                      
  intangible                  29           19                  83           47  
  assets in                                                                     
  cost of                                                                       
  revenue                                                                       
  Amortizat…                                                                    
  of                                                                            
  acquired                                                                      
  intangible                  44           32                 117           76  
  assets in                                                                     
  operating                                                                     
  expenses                                                                      
  Depreciat…                                                                    
  and other                   22           13                  54           39  
  amortizat…                                                                    
  Interest                                                                      
  (income)                     1          -26                  -7          -97  
  expense,                                                                      
  net                                                                           
  Other                                                                         
  (income)                    -1           21                   —            7  
  expense,                                                                      
  net(1)                                                                        
  Income tax                                                                    
  expense,                    10          -15                  38            9  
  net                                                                           
  EBITDA                     179           13                 417           41  
  Stock-bas…                                                                    
  compensat…                  32           71                 112          153  
  expense                                                                       
  Acquisiti…                                                                    
  and                                                                           
  integrati…                  15           30                  27           56  
  related                                                                       
  costs                                                                         
  Restructu…                                                                    
  and                          —            —                   4            6  
  related                                                                       
  costs                                                                         
  Settlemen…                                                                    
  and                          3            —                 -15            9  
  impairmen…                                                                    
  Adjusted                $  229       $  114              $  545       $  265  
  EBITDA                                                                        
  _________…                                                                    
  (1)Includ…                                                                    
  $3 million                                                                    
  and $4                                                                        
  million of                                                                    
  depreciat…                                                                    
  and                                                                           
  amortizat…                                                                    
  expense,                                                                      
  including                                                                     
  above-mar…                                                                    
  lease                                                                         
  amortizat…                                                                    
  associated                                                                    
  with                                                                          
  lessor                                                                        
  activities                                                                    
  for the                                                                       
  three                                                                         
  months                                                                        
  ended                                                                         
  September                                                                     
  30, 2026                                                                      
  and 2025,                                                                     
  respectiv…                                                                    
  and $11                                                                       
  million                                                                       
  and $17                                                                       
  million                                                                       
  for the                                                                       
  nine                                                                          
  months                                                                        
  ended                                                                         
  September                                                                     
  30, 2026                                                                      
  and 2025,                                                                     
  respectiv…                                                                    
                                                                                
                                                                                
  CoStar                                                                        
  Group,                                                                        
  Inc.                                                                          
  Results                                                                       
  of                                                                            
  Segments     Three                             Nine                           
  -            Months                            Months                         
  Unaudite…    Ended                             Ended                          
  (in          September                         September                      
  millions)    30,                               30,                            
  EBITDA       2026                2025          2026               2025        
 ────────────────────────────────────────────────────────────────────────────── 
  Commerci…                                                                     
  Real         $            163    $      114    $           452    $      335  
  Estate                                                                        
  Resident…                                                                     
  Real                       16          -101                -35          -294  
  Estate                                                                        
  Total        $            179    $       13    $           417    $       41  
  EBITDA                                                                        
  Adjusted                                                                      
  EBITDA                                                                        
  Commerci…                                                                     
  Real         $            180    $      183    $           513    $      495  
  Estate                                                                        
  Resident…                                                                     
  Real                       49           -69                 32          -230  
  Estate                                                                        
  Total                                                                         
  Adjusted     $            229    $      114    $           545    $      265  
  EBITDA                                                                        
  ________…                                                                     
  (1)During                                                                     
  the                                                                           
  fourth                                                                        
  quarter                                                                       
  of 2025,                                                                      
  we                                                                            
  changed                                                                       
  the                                                                           
  composit…                                                                     
  of our                                                                        
  segments                                                                      
  from                                                                          
  geograph…                                                                     
  to                                                                            
  product                                                                       
  portfoli…                                                                     
  We have                                                                       
  recast                                                                        
  certain                                                                       
  prior                                                                         
  period                                                                        
  disclosu…                                                                     
  to align                                                                      
  with                                                                          
  new                                                                           
  segments.                                                                     
                                                                                
                                                                                
      …  …       …          …          …          …  …       …          …       
 ────────────────────────────────────────────────────────────────────────────── 
      $  …       $  6       $  …       $  …       $  3       $  …       $  …    
         8          …          …          …          9          …          …    
         …          …          …          …          …          …          …    
         …          …          …          …          …          …          …    
         …          …          …          …          …          …          …    
         …          4          …          7          7          5          …    
         …          …          …          —          —          —          —    
         —          —          —          —          —          9          —    
         7          …          —          —          2          2          —    
         8          1          —          —          —          …          3    
         …          …          …          …          …          …          …    
         …  %       …  %       …  %       …  %       …  %       …  %       …    
         …          …          …          …          …          …          …    
      $  …       $  …       $  …       $     …    $     …    $     …    $       
      $     …    $     …    $     …    $     …    $     …    $     …    $       
      …          …          …          …          …          …          …       
      …          —          …          —          —          —          —       
      …          …          …          …          …          …          …       
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
  C…                                                                            
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  to                                                                            
  E…                                                                            
  a…                                                                            
  A…                                                                            
  E…    Q1  20…    Q2         Q3        Q4         Q1  2…    Q2         Q3      
 ────────────────────────────────────────────────────────────────────────────── 
  N…                                                                            
  i…    $   -15    $     6    $   -…    $    47    $    3    $    55    $   74  
  (…                                                                            
  A…                                                                            
  of         28         44        51         69        64         63        73  
  a…                                                                            
  i…                                                                            
  D…                                                                            
  a…         14         12        13         11        14         18        22  
  o…                                                                            
  a…                                                                            
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  (…        -38        -33        -…        -13        -…          2         1  
  e…                                                                            
  n…                                                                            
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  (…          2        -16        21          1         1          —        -1  
  e…                                                                            
  n…                                                                            
  I…                                                                            
  t…          8         16        -…         14         9         19        10  
  e…                                                                            
  n…                                                                            
  E…         -1         29        13        129        81        157        1…  
  S…                                                                            
  c…         30         52        71         41        42         38        32  
  e…                                                                            
  A…                                                                            
  a…                                                                            
  i…         22          4        30          7         7          5        15  
  r…                                                                            
  c…                                                                            
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  a…          7         -1         —          —         2          2         —  
  r…                                                                            
  c…                                                                            
  S…                                                                            
  a…          8          1         —          —         —        -18         3  
  i…                                                                            
  A…    $    66    $    85    $   1…    $   177    $   1…    $   184    $   2…  
  E…                                                                            
  _…                                                                            
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  $9                                                                            
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  a…                                                                            
  l…                                                                            
  a…                                                                            
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  w…                                                                            
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 ────────────────────────────────────────────────────────────────────────────── 
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  E…                                                                            
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  E…                                                                            
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Investor Relations:

Rich Simonelli
Head of Investor Relations
CoStar Group Investor Relations
(973) 896-8184

getrich@costar.com
News Media:

Matthew Blocher

Vice President

CoStar Group Corporate Marketing & Communications

(202) 346-6775

mblocher@costar.com
                                                                                
  About CoStar Group                                                            
                                                                                
CoStar Group (NASDAQ: CSGP) is a leading global provider of online real estate
marketplaces, information, analytics, and 3D digital twin technology in the
property markets. Founded in 1986, CoStar Group is dedicated to digitizing the
world’s real estate, empowering all people to discover properties, insights, and
connections that improve their businesses and lives.

CoStar Group’s major brands include CoStar, a leading global provider of
commercial real estate data, analytics, and news; LoopNet, the most trafficked
commercial real estate marketplace; Apartments.com, the leading platform for
apartment rentals; Homes.com, the fastest-growing residential real estate
marketplace; and Domain, one of Australia’s leading property marketplaces.
CoStar Group’s industry-leading brands also include Matterport, a leading
spatial data company whose platform turns buildings into data to make every
space more valuable and accessible; STR, a global leader in hospitality data and
benchmarking; Zonda, a leading provider of data, analytics, software, and
marketplace solutions for the residential construction industry; Ten-X, an
online platform for commercial real estate auctions and negotiated bids; and
OnTheMarket, a leading residential property portal in the United Kingdom.

CoStar Group’s websites attracted 121 million average monthly unique visitors in
the third quarter of 2026, serving clients around the world. Headquartered in
Arlington, Virginia, CoStar Group is committed to transforming the real estate
industry through innovative technology and comprehensive market intelligence.
From time to time, we plan to utilize our corporate website as a channel of
distribution for material company information. For more information, visit
CoStarGroup.com.

This news release and the Company’s earnings conference call contain “forward-
looking statements” within the meaning of the Private Securities Litigation
Reform Act of 1995. Such statements include, but are not limited to, statements
about CoStar Group's plans, objectives, expectations, beliefs and intentions and
other statements including words such as “hope,” “anticipate,” “may,” “likely,”
“might,” “believe,” “expect,” “observe,” “consider,” “think,” “intend,”
“envision,” “will,” “should,” “could,” “would,” “plan,” “target,” “goal,”
“estimate,” “predict,” “continue,” “commit,” and “potential” or the negative of
these terms or other comparable terminology. Such statements are based upon the
current beliefs and expectations of management of CoStar Group and are subject
to many risks and uncertainties. Actual results may differ materially from the
results anticipated in the forward-looking statements and the assumptions and
estimates used as a basis for the forward-looking statements. The following
factors, among others, could cause or contribute to such differences: our
inability to attract and retain new clients; our inability to successfully
develop and introduce new or updated real estate information, analytics, and
online marketplaces; the risks related to AI technologies, such as Homes Ai and
Apartments Ai; the planned CoStar Ai launch may be delayed or changed; our
inability to compete successfully against existing or future competitors in
attracting advertisers and in general; the effects of fluctuations and market
cyclicality; the effects of global economic uncertainties and downturns or a
downturn or consolidation in the real estate industry; our inability to hire
qualified persons for, or retain and continue to develop, our sales force, or
unproductivity of our sales force; our inability to retain and attract highly
capable management and operating personnel; the downward pressure that our
internal and external investments may place on our operating margins; our
inability to increase brand awareness; our inability to maintain or increase
internet traffic to our marketplaces, and the risk that the methods, including
Google Analytics, that we use to measure average monthly unique visitors to our
portals may misstate the actual number of unique persons who visit our network
of mobile applications and websites for a given month or may differ from the
methods used by competitors; our inability to attract new advertisers; our
inability to successfully identify, finance, integrate, and/or manage costs
related to acquisitions; our inability to complete certain strategic
transactions if a proposed transaction is subject to review or approval by
regulatory authorities pursuant to applicable laws or regulations; our inability
to realize the benefits of the acquisitions of Matterport, LLC ("Matterport"),
Domain Holdings Australia Pty Limited, or Bora Inc. and its subsidiaries
("Zonda"), or to complete the acquisition of Vexcel Group, Inc. and its
subsidiaries ("Vexcel") in a timely manner, or at all, or realize the expected
benefits of the Vexcel acquisition; the inability of third-party suppliers upon
which Matterport relies to fulfill its needs; the effects of cyberattacks and
security vulnerabilities, and technical problems or disruptions; the significant
costs associated with undertaking a large infrastructure project; our inability
to generate increased revenue from our current or future geographic expansion
plans; the risks related to acceptance of credit cards and debit cards and
facilitation of other customer payments; the effects of climate-related events
and other events beyond our control; the effects related to attention to
climate-related risks and opportunities; our inability to obtain and maintain
accurate, comprehensive, or reliable data; our inability to obtain and maintain
stable data feeds, or disruption of our data feeds; our inability to enforce or
defend our ownership and use of intellectual property; the effects of use of new
and evolving technologies, including artificial intelligence, on our ability to
protect our data and intellectual property from misappropriation by third
parties; our inability to defend against potential legal liability for
collecting, displaying, or distributing information; our inability to obtain or
retain listings from real estate brokers, agents, property owners, and apartment
property managers; our inability to maintain or establish relationships with
third-party listing providers;

our inability to comply with the rules and compliance requirements of Multiple
Listing Services; the risks related to open source software; the risks related
to international operations; the effects of foreign currency exchange rate
fluctuations; our indebtedness; the effects of a lowering or withdrawal of the
ratings assigned to our debt securities by rating agencies; the effects of any
actual or perceived failure to comply with privacy or data protection laws,
regulations, or standards; the effects of changes in tax laws, regulations, or
fiscal and tax policies; the effects of third-party claims, litigation,
regulatory proceedings, or government investigations; the risks related to
return on investment; and the risks related to the specific timing, price, and
size of repurchases under the Stock Repurchase Program, including that the Stock
Repurchase Program may be suspended or discontinued at any time at the Company’s
discretion. More information about potential factors that could cause results to
differ materially from those anticipated in the forward-looking statements
include, but are not limited to, those stated in CoStar Group’s filings from
time to time with the Securities and Exchange Commission (the "SEC"), including
in CoStar Group’s Annual Reports on Form 10-K and Quarterly Reports on Form
10-Q, each of which is filed with the SEC, including in the “Risk Factors”
section of those filings, as well as CoStar Group’s other filings with the SEC
(including Current Reports on Form 8-K) available at the SEC’s website
(www.sec.gov). All forward-looking statements are based on information available
to CoStar Group on the date hereof, and CoStar Group assumes no obligation to
update or revise any forward-looking statements, whether as a result of new
information, future events or otherwise, except as required by applicable law.
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