Who owns IDXX
Institutions that file 13Fs hold 95% of the shares
Shares they hold, quarter on quarter
+1.4%
115 new, 443 added, 472 cut, 133 sold out
Top 10 holders
44%
of the shares institutions hold
A 13F lists the long positions of managers with more than $100M in US stocks. It shows the last day of a quarter and is filed up to 45 days later. Two managers can report the same shares, so totals can count some shares twice.
Institutional owners
The 25 biggest holders
| Holder | Shares | Value | % of company | From Mar 31, 2026 |
|---|---|---|---|---|
| BlackRock, Inc. | 8.17M | $4.3B | 10.37% | Reduced -2.3% |
| VANGUARD CAPITAL MANAGEMENT LLC | 5.15M | $2.7B | 6.54% | Reduced -0.6% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 3.90M | $2.1B | 4.95% | Held |
| STATE STREET CORP | 3.75M | $2.0B | 4.76% | Added +2.0% |
| Invesco Ltd. | 3.61M | $1.9B | 4.58% | Added +7.8% |
| GEODE CAPITAL MANAGEMENT, LLC | 2.56M | $1.3B | 3.25% | Reduced -3.7% |
| BAMCO INC /NY/ | 1.98M | $1.0B | 2.51% | Added +21.0% |
| MORGAN STANLEY | 1.36M | $713.9M | 1.72% | Added +3.1% |
| Bank of New York Mellon Corp | 1.19M | $628.2M | 1.51% | Reduced -20.7% |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.07M | $561.8M | 1.35% | Added +27.2% |
| Fundsmith LLP | 1.02M | $536.9M | 1.29% | Reduced -30.4% |
| BLAIR WILLIAM & CO/IL | 919K | $483.6M | 1.17% | Reduced -2.9% |
| NORTHERN TRUST CORP | 918K | $483.3M | 1.17% | Added +0.7% |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 911K | $479.8M | 1.16% | Added +4.6% |
| FMR LLC | 823K | $433.1M | 1.04% | Added +190.7% |
| AMERICAN CENTURY COMPANIES INC | 808K | $425.6M | 1.03% | Added +34.7% |
| Capital Research Global Investors | 789K | $415.5M | 1.00% | Added +1.0% |
| JPMORGAN CHASE & CO | 756K | $405.1M | 0.96% | Reduced -3.1% |
| PRINCIPAL FINANCIAL GROUP INC | 743K | $391.3M | 0.94% | Reduced -15.7% |
| GOLDMAN SACHS GROUP INC | 739K | $388.9M | 0.94% | Added +3.0% |
| WELLINGTON MANAGEMENT GROUP LLP | 727K | $382.6M | 0.92% | Reduced -1.2% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 650K | $342.4M | 0.83% | Added +6.6% |
| Legal & General Group Plc | 617K | $324.9M | 0.78% | Reduced -5.2% |
| DIMENSIONAL FUND ADVISORS LP | 609K | $320.6M | 0.77% | Added +6.2% |
| FRANKLIN RESOURCES INC | 576K | $303.1M | 0.73% | Reduced -13.1% |
Show the other 15 holders
This quarter
Who bought and who sold the most shares
Bought the most shares
- FMR LLC +540K
- NORGES BANK +354K, new
- BAILLIE GIFFORD & CO +354K, new
- BAMCO INC /NY/ +343K
- MASSACHUSETTS FINANCIAL SERVICES CO /MA/ +337K, new
- Assenagon Asset Management S.A. +281K
- Invesco Ltd. +262K
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP +228K
- Squarepoint Ops LLC +215K
- AMERICAN CENTURY COMPANIES INC +208K
Sold the most shares
- Capital World Investors -498K, sold out
- Fundsmith LLP -446K
- Bank of New York Mellon Corp -311K
- Railway Pension Investments Ltd -211K
- LOS ANGELES CAPITAL MANAGEMENT LLC -210K
- BlackRock, Inc. -195K
- PRICE T ROWE ASSOCIATES INC /MD/ -180K
- POLEN CAPITAL MANAGEMENT LLC -163K
- FUNDSMITH INVESTMENT SERVICES LTD. -155K
- PRINCIPAL FINANCIAL GROUP INC -138K
Superinvestors
Superinvestors holding IDXX
| Investor | Quarter | Shares | Value | % of portfolio | Last quarter |
|---|---|---|---|---|---|
| Terry Smith Fundsmith | Jun 30, 2026 | 1.02M | $536.9M | 3.93% | Reduced -30.4% |
| Polen Capital Polen Capital Management | Jun 30, 2026 | 532K | $280.3M | 2.58% | Reduced -23.5% |
| Jensen Investment Jensen Investment Management | Sep 30, 2026 | 111K | $57.8M | 1.81% | Added +4.6% |
| Wally Weitz Weitz Investment Management | Jun 30, 2026 | 35K | $18.6M | 1.38% | Held |
| Bill Nygren Harris Associates (Oakmark) | Jun 30, 2026 | 455 | $240K | 0.00% | Reduced -5.6% |
More than 5%
13D filings: owners who may push for change
No Schedule 13D about IDXX in the last year.