Idexx Laboratories's top three insider shareholders as of June 06, 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 |
|---|---|---|---|---|
| Daniel M Junius | - | 3,304 | 0 | 14 May, 2025 |
| M Anne Szostak | - | 262 | 1,801 | 26 Aug, 2025 |
| Joseph L Hooley | - | 75 | 0 | 03 Feb, 2026 |
| Jonathan W Ayers | - | 0 | 419,574 | 09 Sep, 2024 |
| Stuart Essig | - | 2,236 | 0 | 08 May, 2025 |
| James F Polewaczyk | Executive Vice President | 10,711 | 0 | 07 Mar, 2024 |
| Bruce L. Claflin | - | 0 | 1,560 | 01 Dec, 2021 |
| Sophie V. Vandebroek | - | 0 | 8,173 | 05 May, 2023 |
| Giovani Twigge | Senior Vice President | 20,329 | 0 | 25 Feb, 2022 |
| Irene Chang Britt | - | 208 | 0 | 08 May, 2024 |
| George Fennell | Executive Vice President | 10,078 | 0 | 17 Feb, 2026 |
| Jonathan Jay Mazelsky | President And Ceo | 83,803 | 0 | 02 Mar, 2026 |
| Martin Alexander Smith | Executive Vice President | 2,157 | 0 | 17 Feb, 2026 |
| Sharon E. Underberg | Evp, Gc Corporate Secretary | 7,138 | 0 | 05 Mar, 2026 |
| Michael Lane | Executive Vice President | 8,024 | 0 | 17 Feb, 2026 |
| Kathy V Turner | Senior Vice President | 7,380 | 0 | 17 Feb, 2023 |
| Nimrata Hunt | Executive Vice President | 18,141 | 0 | 05 Mar, 2026 |
| Asha Collins | - | 779 | 0 | 08 May, 2024 |
| Michael Perkins Johnson | Executive Vice President | 2,795 | 0 | 17 Feb, 2026 |
| Michael Schreck | Executive Vice President | 3,089 | 0 | 17 Feb, 2026 |
| Michael G Erickson | Executive Vice President | 15,092 | 0 | 19 Feb, 2026 |
| Andrew Emerson | Evp, Cfo And Treasurer | 4,222 | 0 | 17 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 | Sharon E. Underberg | Common Stock | A | 197 | $505.53 | 7,138 | D | M |
| 03 Mar, 2026 | Sharon E. Underberg | Common Stock | A | 197 | $505.53 | 7,138 | D | M |
| 03 Mar, 2026 | Nimrata Hunt | Common Stock | D | 1,758 | $634.57 | 18,141 | D | S |
| 03 Mar, 2026 | Sharon E. Underberg | Incentive Stock Option (right-to-buy) | D | 197 | - | 0 | 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 | 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 | 1,281 | $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 | 1,095 | $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 | 1,669 | $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 | 1,171 | $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 | 1,111 | $654.63 | 100,605 | D | S |
| 26 Feb, 2026 | Jonathan Jay Mazelsky | Common Stock | D | 1,488 | $655.85 | 99,117 | D | S |