Idexx Laboratories, Inc. (IDXX) Shareholders & Insider Trades
Idexx Laboratories shareholders at a glance
The largest holder of Idexx Laboratories stock is BlackRock Advisors LLC, with 6.3 million shares (7.96% of the company), worth about $3.49 billion as of September 25, 2026. The 10 largest holders together own 40.0%.
In Q2 2026, 1,340 institutional holdings reports listed shares worth $39.30 billion.
Insiders reported 85 transactions in the last two years: 23 sales worth $92.04 million and no purchases. The newest one on file is from May 7, 2026 (Vandebroek Sophie V, Director).
Major holders as of September 25, 2026; quarterly totals from institutional holdings reports (latest Q2 2026); insider transactions on file through May 7, 2026.
Idexx Laboratories, Inc.
Shareholders Summary
2026Q2
Ownership by Type
Geographic Distribution
Largest Idexx Laboratories shareholders
| Holder | Shares | % of company | Value |
|---|---|---|---|
| BlackRock Advisors LLC | 6.3 million | 7.96% | $3.5B |
| Vanguard Capital Management LLC | 5.2 million | 6.54% | $2.9B |
| Vanguard Portfolio Management LLC | 3.9 million | 4.95% | $2.2B |
| State Street Corporation | 3.7 million | 4.76% | $2.1B |
| Invesco Advisers, Inc. | 3.6 million | 4.58% | $2.0B |
| Geode Capital Management LLC | 2.6 million | 3.25% | $1.4B |
| BAMCO, Inc. | 2.0 million | 2.51% | $1.1B |
| BlackRock Life Ltd. | 1.8 million | 2.25% | $985.0M |
| Eaton Vance Management | 1.4 million | 1.72% | $755.0M |
| BNY Mellon Investment Adviser, Inc. | 1.2 million | 1.52% | $666.0M |
As of September 25, 2026.
Idexx Laboratories institutional holdings by quarter
| Quarter | Reports | Shares | Value |
|---|---|---|---|
| Q2 2026 | 1,340 | – | $39.3B |
| Q1 2026 | 1,354 | 73.4 million | $41.3B |
| Q4 2025 | 1,428 | – | $50.6B |
| Q3 2025 | 1,359 | 73.4 million | $46.8B |
| Q2 2025 | 1,283 | 75.1 million | $40.3B |
| Q1 2025 | 1,192 | 74.3 million | $31.2B |
| Q4 2024 | 1,175 | 72.3 million | $29.9B |
| Q3 2024 | 1,167 | 74.2 million | $37.1B |
Shares and value held by institutions that file quarterly holdings reports (options not included).
Idexx Laboratories insider trades
| Insider | Date | Title | Transaction | Value |
|---|---|---|---|---|
| Vandebroek Sophie V | May 7, 2026 | Director | -- | – |
| Kingsley Lawrence D | May 7, 2026 | Director | -- | – |
| Hooley Joseph L. | May 7, 2026 | Director | -- | – |
| Peacock Karen | May 7, 2026 | Director | -- | – |
| Junius Daniel M | May 7, 2026 | Director | -- | – |
| Szostak Margaret Anne | May 7, 2026 | Director | -- | – |
| Hooley Joseph L. | Apr 30, 2026 | Director | Stock Award(Grant) at price 560.80 per share. | $24,114 |
| Underberg Sharon E | Mar 3, 2026 | General Counsel | Conversion of Exercise of derivative security at price 505.53 per share. | $99,589 |
| Hunt Nimrata K | Mar 3, 2026 | Officer | Sale at price 634.57 per share. | $1.1M |
| Mazelsky Jonathan Jay | Feb 27, 2026 | Chief Executive Officer | Conversion of Exercise of derivative security at price 141.60 - 505.53 per share. | $3.4M |
| Hunt Nimrata K | Feb 26, 2026 | Officer | Sale at price 661.54 per share. | $1.8M |
| Mazelsky Jonathan Jay | Feb 26, 2026 | Chief Executive Officer | Sale at price 650.67 - 663.04 per share. | $15.3M |
Newest 12 of 85 insider transactions in the last two years.
Questions and answers
Who owns the most Idexx Laboratories stock?
BlackRock Advisors LLC, with 7.96% of the company (as of September 25, 2026). Next: Vanguard Capital Management LLC (6.54%) and Vanguard Portfolio Management LLC (4.95%).
How many institutions own Idexx Laboratories stock?
1,340 institutional holdings reports listed Idexx Laboratories shares in Q2 2026 worth $39.30 billion.
Are Idexx Laboratories insiders buying or selling the stock?
In the last two years insiders reported 23 sales and no purchases (85 transactions in all); the newest on file is from May 7, 2026.
