Mesa Laboratories's three largest insider shareholders as of March 23, 2026 are Gary M Owens (President And Ceo, 64.14K shares), John Bradley Schmieder (Director, 62.76K shares), John James Sullivan (Director, 44.78K shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Gary M Owens | President And Ceo | 64,135 | 0 | 28 Oct, 2025 |
| John Bradley Schmieder | 62,760 | 0 | 19 Sep, 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 | 25,282 | 0 | 05 Dec, 2025 | |
| John Bradley Schmieder | 0 | 19,360 | 15 Feb, 2022 | |
| 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 | |
| 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 |
|---|---|---|---|---|---|---|---|---|
| 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 |
| 10 Mar, 2026 | Shiraz Shabanali Ladiwala | Common Stock | A | 3,500 | $72.23 | 8,523 | 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 | Jennifer Sadie Alltoft | Common Stock | A | 1,404 | $0.00 | 4,878 | 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 | Restricted Stock Units - 8 | 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 | 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 - 8 | 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 | Jennifer Sadie Alltoft | Restricted Stock Units - 9 | 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 |
| 15 Aug, 2025 | John James Sullivan | Common Stock | A | 1,404 | $0.00 | 27,282 | D | M |
| 15 Aug, 2025 | Shiraz Shabanali Ladiwala | Common Stock | A | 1,949 | $0.00 | 5,023 | D | M |
| 15 Aug, 2025 | Shiraz Shabanali Ladiwala | Restricted Stock Units - 5 | D | 1,949 | $0.00 | 0 | D | M |