Based on data from the past 90 days ending December 12, 2025, Idexx Laboratories's three largest insider shareholders are Executive Vice President Nimrata Hunt (21.15K shares), Executive Vice President Michael G Erickson (11.29K shares), Executive Vice President Michael Lane (7.13K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Jonathan W Ayers | 158,256 | 09 Sep, 2024 | |
| Jonathan Jay Mazelsky | President And CEO | 82,443 | 04 Sep, 2025 |
| Brian P Mckeon | EVP And CFO And Treasurer | 31,550 | 18 Feb, 2025 |
| Nimrata Hunt | Executive Vice President | 21,149 | 10 Nov, 2025 |
| Giovani Twigge | Senior Vice President | 20,329 | 25 Feb, 2022 |
| Rebecca M Henderson | 14,696 | 25 Feb, 2021 | |
| Michael G Erickson | Executive Vice President | 11,287 | 14 Aug, 2025 |
| James F Polewaczyk | Executive Vice President | 10,711 | 07 Mar, 2024 |
| Sophie V. Vandebroek | 9,340 | 13 May, 2025 | |
| Lawrence D Kingsley | 9,229 | 08 May, 2025 | |
| George Fennell | Executive Vice President | 8,347 | 18 Feb, 2025 |
| Kathy V Turner | Senior Vice President | 7,380 | 17 Feb, 2023 |
| Michael Lane | Executive Vice President | 7,132 | 08 Aug, 2025 |
| Sharon E. Underberg | EVP And GC & Corporate Secretary | 6,339 | 12 Aug, 2025 |
| Andrew Emerson | EVP And CFO And Treasurer | 3,871 | 11 Aug, 2025 |
| Daniel M Junius | 3,304 | 14 May, 2025 | |
| Michael Perkins Johnson | Executive Vice President | 2,365 | 03 Jun, 2025 |
| Stuart Essig | 2,236 | 08 May, 2025 | |
| Michael Schreck | Executive Vice President | 1,956 | 18 Feb, 2025 |
| Bruce L. Claflin | 1,721 | 20 May, 2024 | |
| Martin Alexander Smith | Executive Vice President | 1,434 | 03 Sep, 2025 |
| Asha Collins | 779 | 08 May, 2024 | |
| M Anne Szostak | 521 | 26 Aug, 2025 | |
| Irene Chang Britt | 208 | 08 May, 2024 | |
| Joseph L Hooley | 39 | 03 Nov, 2025 |
* 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 |
|---|---|---|---|---|---|---|---|---|
| 07 Nov, 2025 | Nimrata Hunt | Common Stock | A | 7,125 | $288.78 | 25,169 | D | M |
| 07 Nov, 2025 | Nimrata Hunt | Common Stock | A | 5,405 | $505.53 | 30,574 | D | M |
| 07 Nov, 2025 | Nimrata Hunt | Common Stock | D | 5,114 | $702.20 | 25,460 | D | S |
| 07 Nov, 2025 | Nimrata Hunt | Common Stock | D | 1,465 | $703.73 | 23,995 | D | S |
| 07 Nov, 2025 | Nimrata Hunt | Common Stock | D | 1,468 | $704.87 | 22,527 | D | S |
| 07 Nov, 2025 | Nimrata Hunt | Common Stock | D | 1,378 | $705.54 | 21,149 | D | S |
| 30 Oct, 2025 | Joseph L Hooley | Common Stock | A | 39 | $628.54 | 39 | D | A |
| 01 Sep, 2025 | Martin Alexander Smith | Common Stock | A | 18 | $0.00 | 1,439 | D | M |
| 01 Sep, 2025 | Martin Alexander Smith | - | - | 1,439 | D | |||
| 01 Sep, 2025 | Martin Alexander Smith | Common Stock | D | 5 | $647.09 | 1,434 | D | F |
| 01 Sep, 2025 | Martin Alexander Smith | - | - | 1,434 | D | |||
| 22 Aug, 2025 | M Anne Szostak | - | - | 2,449 | D | |||
| 22 Aug, 2025 | M Anne Szostak | Common Stock | A | 2,187 | $206.62 | 2,449 | D | M |
| 22 Aug, 2025 | M Anne Szostak | Common Stock | D | 2,187 | $647.33 | 262 | D | S |
| 22 Aug, 2025 | M Anne Szostak | - | - | 262 | D | |||
| 22 Aug, 2025 | M Anne Szostak | - | - | 1,542 | I | |||
| 22 Aug, 2025 | M Anne Szostak | Common Stock | D | 259 | $0.00 | 1,542 | I | G |
| 22 Aug, 2025 | M Anne Szostak | - | - | 259 | I | |||
| 22 Aug, 2025 | M Anne Szostak | Common Stock | A | 259 | $0.00 | 259 | I | G |
| 15 Aug, 2025 | Jonathan Jay Mazelsky | - | - | 82,443 | D |