Data spanning the past 90 days through December 20, 2025 reveals that Mesa Laboratories's three principal insider shareholders consist of Director John Bradley Schmieder (82.12K shares), Director John James Sullivan (70.06K shares), President And CEO Gary M Owens (64.14K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| John Bradley Schmieder | 82,120 | 19 Sep, 2023 | |
| John James Sullivan | 70,062 | 05 Dec, 2025 | |
| Gary M Owens | President And CEO | 64,135 | 28 Oct, 2025 |
| Laboratories Inc /Co/ Mesa | 29,788 | 16 Jun, 2022 | |
| Evan Guillemin | 29,207 | 02 Sep, 2022 | |
| John Sakys | Cfo | 15,044 | 25 Jun, 2025 |
| Shiraz Shabanali Ladiwala | 5,023 | 18 Aug, 2025 | |
| Jennifer Sadie Alltoft | 4,878 | 18 Aug, 2025 | |
| Shannon Hall | 4,189 | 18 Aug, 2025 | |
| R Tony Tripeny | 4,083 | 18 Aug, 2025 | |
| Gregory Dinoia | SVP Commercial | 3,634 | 22 Jun, 2022 |
| David M Kelly | 2,600 | 09 Nov, 2021 | |
| Brian David Archbold | SVP Operations | 2,407 | 25 Jun, 2025 |
| Mark Christopher Capone | 2,128 | 18 Aug, 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 |
|---|---|---|---|---|---|---|---|---|
| 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 | Shiraz Shabanali Ladiwala | Common Stock | A | 1,949 | $0.00 | 5,023 | D | M |
| 15 Aug, 2025 | Shiraz Shabanali Ladiwala | - | - | 5,023 | D | |||
| 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 | Common Stock | A | 1,404 | $0.00 | 4,083 | D | M |
| 15 Aug, 2025 | John James Sullivan | Common Stock | A | 1,404 | $0.00 | 27,282 | D | M |
| 21 Jun, 2025 | Brian David Archbold | Common Stock | A | 844 | $95.82 | 2,792 | D | M |
| 21 Jun, 2025 | Brian David Archbold | - | - | 2,792 | D | |||
| 21 Jun, 2025 | John Sakys | Common Stock | A | 1,036 | $95.82 | 15,498 | D | M |
| 21 Jun, 2025 | Brian David Archbold | Common Stock | D | 385 | $95.82 | 2,407 | D | F |
| 21 Jun, 2025 | John Sakys | Common Stock | D | 454 | $95.82 | 15,044 | D | F |
| 21 Jun, 2025 | Gary M Owens | Common Stock | A | 3,301 | $95.82 | 54,022 | D | M |
| 21 Jun, 2025 | Gary M Owens | Common Stock | D | 1,445 | $95.82 | 52,577 | D | F |
| 18 Jun, 2025 | Brian David Archbold | Common Stock | A | 2,556 | $92.99 | 3,114 | D | M |
| 18 Jun, 2025 | John Sakys | Common Stock | A | 2,840 | $92.99 | 15,705 | D | M |
| 18 Jun, 2025 | Gary M Owens | Common Stock | A | 8,707 | $92.99 | 54,531 | D | M |
| 18 Jun, 2025 | Brian David Archbold | Common Stock | D | 1,166 | $92.99 | 1,948 | D | F |