Mesa Laboratories's top three insider shareholders as of April 25, 2026 are Gary M Owens (President And Ceo, 64.14K shares), Gary M Owens (President And Ceo, 64.14K shares), John Bradley Schmieder (Director, 62.76K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Gary M Owens | President And Ceo | 64,135 | 0 | 28 Oct, 2025 |
| Gary M Owens | President And Ceo | 64,135 | 0 | 28 Oct, 2025 |
| John Bradley Schmieder | - | 62,760 | 0 | 19 Sep, 2023 |
| John Bradley Schmieder | - | 62,760 | 0 | 19 Sep, 2023 |
| John James Sullivan | - | 0 | 44,780 | 14 Nov, 2023 |
| John James Sullivan | - | 0 | 44,780 | 14 Nov, 2023 |
| Laboratories Inc /Co/ Mesa | - | 29,788 | 0 | 16 Jun, 2022 |
| Evan Guillemin | - | 29,207 | 0 | 02 Sep, 2022 |
| John James Sullivan | President And Ceo | 25,282 | 0 | 05 Dec, 2025 |
| John James Sullivan | President And Ceo | 25,282 | 0 | 05 Dec, 2025 |
| John Bradley Schmieder | - | 0 | 19,360 | 15 Feb, 2022 |
| John Bradley Schmieder | - | 0 | 19,360 | 15 Feb, 2022 |
| John Sakys | Cfo | 15,044 | 0 | 25 Jun, 2025 |
| John Sakys | Cfo | 15,044 | 0 | 25 Jun, 2025 |
| Shiraz Shabanali Ladiwala | - | 8,523 | 0 | 10 Mar, 2026 |
| R Tony Tripeny | - | 5,398 | 0 | 10 Mar, 2026 |
| R Tony Tripeny | - | 5,398 | 0 | 10 Mar, 2026 |
| Jennifer Sadie Alltoft | - | 4,878 | 0 | 18 Aug, 2025 |
| Shannon Hall | - | 4,189 | 0 | 18 Aug, 2025 |
| Gregory Dinoia | Svp Commercial | 3,634 | 0 | 22 Jun, 2022 |
| Mark Christopher Capone | - | 3,429 | 0 | 10 Mar, 2026 |
| David M Kelly | - | 2,600 | 0 | 09 Nov, 2021 |
| Brian David Archbold | Svp Operations | 2,407 | 0 | 25 Jun, 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 |
|---|---|---|---|---|---|---|---|---|
| 14 Apr, 2026 | Siddhartha Kadia | Restricted Stock Units - 1 | A | 34,807 | $0.00 | 34,807 | D | A |
| 14 Apr, 2026 | Siddhartha Kadia | Restricted Stock Units - 1 | A | 34,807 | $0.00 | 34,807 | D | A |
| 31 Mar, 2026 | Gary M Owens | Restricted Stock Unit - 10 | D | 8,211 | $0.00 | 16,448 | D | D |
| 10 Mar, 2026 | Shiraz Shabanali Ladiwala | Common Stock | A | 3,500 | $72.23 | 8,523 | D | P |
| 10 Mar, 2026 | R Tony Tripeny | Common Stock | A | 1,315 | $76.00 | 5,398 | D | P |
| 10 Mar, 2026 | Mark Christopher Capone | Common Stock | A | 1,301 | $76.35 | 3,429 | D | P |
| 02 Dec, 2025 | John James Sullivan | Common Stock | D | 2,000 | $0.00 | 25,282 | D | G |
| 27 Oct, 2025 | Gary M Owens | Common Stock | A | 11,558 | $0.00 | 64,135 | D | M |
| 15 Aug, 2025 | R Tony Tripeny | Common Stock | A | 1,404 | $0.00 | 4,083 | D | M |
| 15 Aug, 2025 | Shannon Hall | Common Stock | A | 1,404 | $0.00 | 4,189 | D | M |
| 15 Aug, 2025 | Mark Christopher Capone | Common Stock | A | 1,404 | $0.00 | 2,128 | D | M |
| 15 Aug, 2025 | Jennifer Sadie Alltoft | Common Stock | A | 1,404 | $0.00 | 4,878 | D | M |
| 15 Aug, 2025 | R Tony Tripeny | Restricted Stock Units - 3 | D | 1,404 | $0.00 | 0 | D | M |
| 15 Aug, 2025 | Mark Christopher Capone | Restricted Stock Units - 2 | D | 1,404 | $0.00 | 0 | D | M |
| 15 Aug, 2025 | Shannon Hall | Restricted Stock Units - 7 | D | 1,404 | $0.00 | 0 | D | M |
| 15 Aug, 2025 | Jennifer Sadie Alltoft | Restricted Stock Units - 8 | D | 1,404 | $0.00 | 0 | D | M |
| 15 Aug, 2025 | Jennifer Sadie Alltoft | Restricted Stock Units - 9 | A | 2,784 | $0.00 | 2,784 | D | A |
| 15 Aug, 2025 | R Tony Tripeny | Restricted Stock Units - 4 | A | 2,784 | $0.00 | 2,784 | D | A |
| 15 Aug, 2025 | Shannon Hall | Restricted Stock Units - 8 | A | 2,784 | $0.00 | 2,784 | D | A |
| 15 Aug, 2025 | Mark Christopher Capone | Restricted Stock Units - 3 | A | 2,784 | $0.00 | 2,784 | D | A |