IDEXX Laboratories
IDXX · NASDAQ
Who owns IDXX
Largest institutional holders, from their latest 13F filings
The 10 largest institutions hold 36.3% of IDXX’s shares.
- Vanguard Capital Management, LLC6.5%
- BlackRock Institutional Trust Company, N.A.6.5%
- Vanguard Portfolio Management, LLC4.9%
- State Street Investment Management (US)4.8%
- Next 6 largest institutions13.6%
- All other shareholders63.7%
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Capital Management, LLC | 5.15M | 6.53% |
| BlackRock Institutional Trust Company, N.A. | 5.15M | 6.53% |
| Vanguard Portfolio Management, LLC | 3.90M | 4.94% |
| State Street Investment Management (US) | 3.75M | 4.75% |
| Invesco Capital Management LLC | 3.14M | 3.99% |
| Geode Capital Management, L.L.C. | 2.56M | 3.25% |
| Baron Capital Management, Inc. | 1.98M | 2.51% |
| Arrowstreet Capital, Limited Partnership | 1.07M | 1.35% |
| Fundsmith LLP | 1.02M | 1.29% |
| BlackRock Asset Management Ireland Limited | 938.40K | 1.19% |
Largest mutual fund holders
| Holder | Shares | % of shares |
|---|---|---|
| Vanguard Total Stock Market Index Fund | 2.51M | 3.18% |
| Vanguard 500 Index Fund | 2.07M | 2.62% |
| Vanguard Mid-Cap Index Fund | 1.71M | 2.16% |
| Invesco QQQ Trust | 1.70M | 2.15% |
| Fundsmith Equity Fund | 1.41M | 1.79% |
Insider trades
Form 4 filings by officers, directors and large holders
Over the last 6 months, insiders sold $1.17M (1 trade) of IDXX on the open market, with no buys.
| Insider | Type | Shares | Value |
|---|---|---|---|
| Kingsley Lawrence D | Option exercise | 2.20K | — |
| Kingsley Lawrence D | Sale | 2.20K | $1.17M |
| Kingsley Lawrence D | Option exercise | 2.20K | $251.52K |
| Emerson Andrew | Option exercise | 265 | — |
| Emerson Andrew | Tax withholding | 86 | — |
| Emerson Andrew | Option exercise | 265 | $47.24K |
| HOOLEY JOSEPH L | Award | 49 | $27.38K |
| FENNELL GEORGE | Option exercise | 639 | — |
| FENNELL GEORGE | Tax withholding | 284 | $160.97K |
| FENNELL GEORGE | Option exercise | 639 | — |
Congressional trades
Disclosed by members of Congress over the last 12 months
| Member | Type | Amount | Traded |
|---|---|---|---|
| Ro KhannaHouse | Purchase | $1K–$15K | Apr 13, 2026 |
| April McClainHouse | Sale | $1K–$15K | Jan 13, 2026 |
| April McClainHouse | Sale | $1K–$15K | Dec 2, 2025 |
| April McClainHouse | Sale | $1K–$15K | Oct 29, 2025 |
Short interest
Settled Sep 30, 2026
- Shares short
- 1.94M
- Days to cover
- 3.91
- % of shares outstanding
- 2.46%
- Average daily volume
- 496.27K
- Change since last report
- +1.2%
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