IDXX IDEXX Laboratories, Inc.
IDEXX Laboratories, Inc. (IDXX) Institutional Ownership
What the institutions did with IDXX last quarter, from their 13F filings. Counting managers rather than shares is the point: a single index fund adding to a position tells you far less than four hundred separate managers all deciding to. Positions as reported for the quarter ended June 30, 2026.
Every manager below opens. Subscribers can see any firm's whole portfolio — every position, its weight, and what they bought, trimmed and exited last quarter.
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Each block is one manager, sized by shares held and colored by how much they moved the position last quarter. Green added, red cut, grey stood pat.
Largest holders
| Manager | Shares | % of reported |
|---|---|---|
| BlackRock, Inc. | 8.2M | 11.0% |
| VANGUARD CAPITAL MANAGEMENT LLC | 5.2M | 6.9% |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 3.9M | 5.2% |
| STATE STREET CORP | 3.7M | 5.0% |
| Invesco Ltd. | 3.6M | 4.9% |
| GEODE CAPITAL MANAGEMENT, LLC | 2.6M | 3.4% |
| BAMCO INC /NY/ | 2.0M | 2.7% |
| MORGAN STANLEY | 1.4M | 1.8% |
| Bank of New York Mellon Corp | 1.2M | 1.6% |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.1M | 1.4% |
| Fundsmith LLP | 1.0M | 1.4% |
| BLAIR WILLIAM & CO/IL | 918.6K | 1.2% |
| NORTHERN TRUST CORP | 918.1K | 1.2% |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 911.5K | 1.2% |
| FMR LLC | 822.6K | 1.1% |
| AMERICAN CENTURY COMPANIES INC | 808.4K | 1.1% |
| Capital Research Global Investors | 789.1K | 1.1% |
| JPMORGAN CHASE & CO | 755.8K | 1.0% |
| PRINCIPAL FINANCIAL GROUP INC | 743.2K | 1.0% |
| GOLDMAN SACHS GROUP INC | 738.7K | 1.0% |
| WELLINGTON MANAGEMENT GROUP LLP | 726.7K | 1.0% |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 650.4K | 0.9% |
| Legal & General Group Plc | 617.2K | 0.8% |
| DIMENSIONAL FUND ADVISORS LP | 608.9K | 0.8% |
| FRANKLIN RESOURCES INC | 575.8K | 0.8% |
Largest changes
| Manager | Action | Previous | Current | Change |
|---|---|---|---|---|
| FMR LLC | Increased | 283.0K | 822.6K | +539.7K |
| Capital World Investors | Sold Out | 497.9K | 0 | -497.9K |
| Fundsmith LLP | Reduced | 1.5M | 1.0M | -445.9K |
| BAILLIE GIFFORD & CO | New | 0 | 353.8K | +353.8K |
| BAMCO INC /NY/ | Increased | 1.6M | 2.0M | +343.4K |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | New | 0 | 337.0K | +337.0K |
| Bank of New York Mellon Corp | Reduced | 1.5M | 1.2M | -311.2K |
| Assenagon Asset Management S.A. | Increased | 85.8K | 366.5K | +280.6K |
| Invesco Ltd. | Increased | 3.3M | 3.6M | +261.7K |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Increased | 838.8K | 1.1M | +228.2K |
| Squarepoint Ops LLC | Increased | 100.3K | 315.2K | +214.9K |
| Railway Pension Investments Ltd | Reduced | 256.5K | 45.4K | -211.1K |
| LOS ANGELES CAPITAL MANAGEMENT LLC | Reduced | 227.4K | 17.6K | -209.8K |
| AMERICAN CENTURY COMPANIES INC | Increased | 599.9K | 808.4K | +208.4K |
| Alyeska Investment Group, L.P. | Increased | 203.3K | 401.1K | +197.8K |
| BlackRock, Inc. | Reduced | 8.4M | 8.2M | -195.4K |
| Vontobel Holding Ltd. | Increased | 5.2K | 191.9K | +186.7K |
| PRICE T ROWE ASSOCIATES INC /MD/ | Reduced | 638.1K | 458.3K | -179.7K |
| POLEN CAPITAL MANAGEMENT LLC | Reduced | 695.8K | 532.4K | -163.4K |
| FUNDSMITH INVESTMENT SERVICES LTD. | Reduced | 481.6K | 327.1K | -154.5K |
| PRINCIPAL FINANCIAL GROUP INC | Reduced | 881.2K | 743.2K | -137.9K |
| Point72 Asset Management, L.P. | Increased | 129.3K | 262.9K | +133.6K |
| Trexquant Investment LP | New | 0 | 123.4K | +123.4K |
| ROYAL BANK OF CANADA | Reduced | 391.7K | 274.3K | -117.4K |
| Rathbones Group PLC | Reduced | 243.0K | 133.5K | -109.5K |
| JENSEN INVESTMENT MANAGEMENT INC | Increased | 3.6K | 105.7K | +102.1K |
| GEODE CAPITAL MANAGEMENT, LLC | Reduced | 2.7M | 2.6M | -98.1K |
| JANE STREET GROUP, LLC | Increased | 15.0K | 105.1K | +90.1K |
| FRANKLIN RESOURCES INC | Reduced | 662.6K | 575.8K | -86.8K |
| Caisse de depot et placement du Quebec | Reduced | 263.1K | 178.5K | -84.5K |
| LORD, ABBETT & CO. LLC | Reduced | 88.2K | 8.4K | -79.9K |
| SG Americas Securities, LLC | Increased | 10.6K | 87.8K | +77.2K |
| AustralianSuper Pty Ltd | Increased | 443.0K | 518.9K | +75.8K |
| STATE STREET CORP | Increased | 3.7M | 3.7M | +74.5K |
| AMERIPRISE FINANCIAL INC | Reduced | 134.3K | 62.8K | -71.5K |
| Clearbridge Investments, LLC | Increased | 308.5K | 379.5K | +71.0K |
| Quantinno Capital Management LP | Increased | 99.8K | 164.3K | +64.5K |
| Qube Research & Technologies Ltd | Increased | 85.7K | 148.4K | +62.7K |
| Allianz Asset Management GmbH | Reduced | 207.4K | 145.2K | -62.2K |
| WORLDQUANT MILLENNIUM ADVISORS LLC | Reduced | 98.4K | 37.0K | -61.3K |
| RENAISSANCE TECHNOLOGIES LLC | Increased | 48.5K | 109.8K | +61.3K |
| UBS Group AG | Increased | 305.2K | 364.7K | +59.5K |
| KBC Group NV | Reduced | 172.7K | 113.6K | -59.1K |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | Reduced | 351.6K | 298.2K | -53.5K |
| CITADEL ADVISORS LLC | Reduced | 87.6K | 38.8K | -48.7K |
| Pictet Asset Management Holding SA | Reduced | 287.9K | 242.5K | -45.4K |
| CITIGROUP INC | Increased | 120.3K | 165.7K | +45.4K |
| MARSHALL WACE, LLP | Increased | 49.3K | 93.1K | +43.8K |
| COMGEST GLOBAL INVESTORS S.A.S. | Increased | 220.4K | 262.6K | +42.2K |
| Amundi | Reduced | 610.8K | 569.7K | -41.1K |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Increased | 14.1K | 54.4K | +40.4K |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | Increased | 610.2K | 650.4K | +40.2K |
| MORGAN STANLEY | Increased | 1.3M | 1.4M | +40.1K |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | Increased | 871.8K | 911.5K | +39.7K |
| CANADA PENSION PLAN INVESTMENT BOARD | Increased | 81.4K | 120.9K | +39.5K |
| BARCLAYS PLC | Reduced | 187.7K | 148.8K | -38.9K |
| Nuveen, LLC | Increased | 445.8K | 484.5K | +38.7K |
| Liontrust Investment Partners LLP | Increased | 177.3K | 215.2K | +37.9K |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | Reduced | 133.9K | 96.1K | -37.8K |
| HRT FINANCIAL LP | New | 0 | 37.6K | +37.6K |
13F filings are due 45 days after quarter end and cover long positions in U.S.-listed equities only, so this is a lagged and partial picture: shorts, bonds and foreign listings never appear. Options positions are excluded here rather than folded into the share counts. Political ownership is coming.