Idexx Laboratories's top three insider shareholders as of April 22, 2026 are Jonathan W Ayers (Director, 419.57K shares), Jonathan W Ayers (Chairman, President Ceo, 122.61K shares), Jonathan Jay Mazelsky (President And Ceo, 83.80K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Jonathan W Ayers | - | 0 | 419,574 | 09 Sep, 2024 |
| Jonathan W Ayers | Chairman, President Ceo | 0 | 122,605 | 09 Sep, 2024 |
| Jonathan Jay Mazelsky | President And Ceo | 83,803 | 0 | 02 Mar, 2026 |
| Jonathan W Ayers | Chairman Of The Board | 35,651 | 0 | 09 Sep, 2024 |
| Giovani Twigge | Senior Vice President | 20,329 | 0 | 25 Feb, 2022 |
| Nimrata Hunt | Executive Vice President | 18,141 | 0 | 05 Mar, 2026 |
| Michael G Erickson | Executive Vice President | 15,092 | 0 | 19 Feb, 2026 |
| James F Polewaczyk | Executive Vice President | 10,711 | 0 | 07 Mar, 2024 |
| George Fennell | Executive Vice President | 10,078 | 0 | 17 Feb, 2026 |
| Sophie V. Vandebroek | - | 0 | 8,173 | 05 May, 2023 |
| Michael Lane | Executive Vice President | 8,024 | 0 | 17 Feb, 2026 |
| Kathy V Turner | Senior Vice President | 7,380 | 0 | 17 Feb, 2023 |
| Sharon E. Underberg | Evp, Gc Corporate Secretary | 7,138 | 0 | 05 Mar, 2026 |
| Andrew Emerson | Evp, Cfo And Treasurer | 4,222 | 0 | 17 Feb, 2026 |
| Daniel M Junius | - | 3,304 | 0 | 14 May, 2025 |
| Michael Schreck | Executive Vice President | 3,089 | 0 | 17 Feb, 2026 |
| Michael Perkins Johnson | Executive Vice President | 2,795 | 0 | 17 Feb, 2026 |
| Stuart Essig | - | 2,236 | 0 | 08 May, 2025 |
| Martin Alexander Smith | Executive Vice President | 2,157 | 0 | 17 Feb, 2026 |
| M Anne Szostak | - | 262 | 1,801 | 26 Aug, 2025 |
| Bruce L. Claflin | - | 0 | 1,560 | 01 Dec, 2021 |
| Asha Collins | - | 779 | 0 | 08 May, 2024 |
| Sophie V. Vandebroek | - | 648 | 0 | 19 Feb, 2026 |
| Irene Chang Britt | - | 208 | 0 | 08 May, 2024 |
| Bruce L. Claflin | - | 161 | 0 | 20 May, 2024 |
| Joseph L Hooley | - | 75 | 0 | 03 Feb, 2026 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 03 Mar, 2026 | Nimrata Hunt | Common Stock | D | 1,758 | $634.57 | 18,141 | D | S |
| 03 Mar, 2026 | Sharon E. Underberg | Common Stock | A | 197 | $505.53 | 7,138 | D | M |
| 03 Mar, 2026 | Sharon E. Underberg | Incentive Stock Option (right-to-buy) | D | 197 | - | 0 | D | M |
| 12 Feb, 2026 | Michael G Erickson | Non-Qualified Stock Option (right-to-buy) | A | 13,667 | $0.00 | 13,667 | D | A |
| 12 Feb, 2026 | Michael G Erickson | Incentive Stock Option (right-to-buy) | A | 162 | $0.00 | 162 | D | A |
| 26 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | A | 23,326 | $141.60 | 106,932 | D | M |
| 26 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | D | 1,281 | $650.67 | 105,651 | D | S |
| 26 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | D | 1,095 | $651.49 | 104,556 | D | S |
| 26 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | D | 1,669 | $652.49 | 102,887 | D | S |
| 26 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | D | 1,171 | $653.68 | 101,716 | D | S |
| 26 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | D | 1,111 | $654.63 | 100,605 | D | S |
| 26 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | D | 1,488 | $655.85 | 99,117 | D | S |
| 26 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | D | 1,343 | $656.85 | 97,774 | D | S |
| 26 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | D | 2,860 | $657.84 | 94,914 | D | S |
| 26 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | D | 3,660 | $658.92 | 91,254 | D | S |
| 26 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | D | 2,859 | $659.75 | 88,395 | D | S |
| 26 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | D | 1,200 | $661.10 | 87,195 | D | S |
| 26 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | D | 1,000 | $662.16 | 86,195 | D | S |
| 26 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | D | 2,589 | $663.04 | 83,606 | D | S |
| 27 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | A | 197 | $505.53 | 83,803 | D | M |