MLAB · Insider Trading
Mesa Laboratories Inc
Every open-market purchase and sale reported by MLAB officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-11 | R Tony Tripeny | Director | A | +1,774 deriv. | — |
| 2026-09-11 | Jennifer Sadie Alltoft | Director | A | +1,774 deriv. | — |
| 2026-09-11 | Shiraz Shabanali Ladiwala | Director | A | +2,510 deriv. | — |
| 2026-09-11 | Shannon Hall | Director | A | +1,774 deriv. | — |
| 2026-09-11 | John James Sullivan | Director | A | +1,774 deriv. | — |
| 2026-09-11 | Mark Christopher Capone | Director | A | +2,423 deriv. | — |
| 2026-08-17 | Siddhartha Kadia | President and CEO | Buy | +7,093 | +$800.09K |
| 2026-08-17 | R Tony Tripeny | Director | Buy | +900 | +$102.32K |
| 2026-08-17 | Mark Christopher Capone | Director | M | +2,784 | — |
| 2026-08-17 | R Tony Tripeny | Director | M | +2,784 | — |
| 2026-08-17 | Shiraz Shabanali Ladiwala | Director | M | +3,810 | — |
| 2026-08-17 | Shannon Hall | Director | M | +2,784 | — |
| 2026-08-17 | John James Sullivan | Director | M | +2,784 | — |
| 2026-08-17 | Jennifer Sadie Alltoft | Director | M | +2,784 | — |
| 2026-08-17 | John James Sullivan | Director | Sell | −7,093 | −$800.09K |
| 2026-06-23 | John Sakys | CFO | MIXED | +3,247 | +$324.62K |
| 2026-06-23 | Lyndsey Elizabeth Crennen | CAO | MIXED | +547 | +$54.49K |
| 2026-06-23 | Brian David Archbold | SVP Operations | MIXED | +2,667 | +$267.72K |
| 2026-06-17 | Brian David Archbold | SVP Operations | Sell | −1,151 | −$116.56K |
| 2026-06-17 | John Sakys | CFO | Sell | −1,223 | −$123.85K |
| 2026-06-17 | Lyndsey Elizabeth Crennen | CAO | Sell | −118 | −$11.95K |
| 2026-06-16 | Brian David Archbold | SVP Operations | M | +2,454 | +$255.41K |
| 2026-06-16 | John Sakys | CFO | M | +2,717 | +$282.79K |
| 2026-05-19 | Siddhartha Kadia | President and CEO | A | +35,236 deriv. | — |
| 2026-04-24 | Siddhartha Kadia | President and CEO | A | +34,807 deriv. | — |
| 2026-04-02 | Gary M Owens | President and CEO | D | −8,211 deriv. | — |
| 2026-03-10 | Shiraz Shabanali Ladiwala | Director | Buy | +3,500 | +$252.81K |
| 2026-03-10 | R Tony Tripeny | Director | Buy | +1,315 | +$99.94K |
| 2026-03-10 | Mark Christopher Capone | Director | Buy | +1,301 | +$99.33K |
| 2025-12-05 | John James Sullivan | Director | G | −2,000 | — |
| 2025-10-28 | Gary M Owens | President and CEO | M | +11,558 | — |
| 2025-08-18 | Mark Christopher Capone | Director | M | +1,404 | — |
| 2025-08-18 | R Tony Tripeny | Director | M | +1,404 | — |
| 2025-08-18 | Jennifer Sadie Alltoft | Director | M | +1,404 | — |
| 2025-08-18 | Shiraz Shabanali Ladiwala | Director | M | +1,949 | — |
| 2025-08-18 | John James Sullivan | Director | M | +1,404 | — |
| 2025-08-18 | Shannon Hall | Director | M | +1,404 | — |
| 2025-06-25 | Brian David Archbold | SVP Operations | MIXED | +459 | +$43.98K |
| 2025-06-25 | John Sakys | CFO | MIXED | +582 | +$55.77K |
| 2025-06-24 | Gary M Owens | President and CEO | MIXED | +1,856 | +$177.84K |
| 2025-06-20 | Brian David Archbold | SVP Operations | MIXED | +1,390 | +$129.26K |
| 2025-06-20 | Gary M Owens | President and CEO | MIXED | +4,897 | +$455.37K |
| 2025-06-20 | John Sakys | CFO | MIXED | +1,597 | +$148.51K |
| 2025-06-18 | Gary M Owens | President and CEO | A | +24,659 deriv. | — |
| 2025-06-18 | Gary M Owens | President and CEO | MIXED | +2,487 | −$188.31K |
| 2025-06-18 | Brian David Archbold | SVP Operations | MIXED | +558 | −$45.84K |
| 2025-06-18 | Brian David Archbold | SVP Operations | A | +7,346 deriv. | — |
| 2025-06-18 | John Sakys | CFO | A | +8,133 deriv. | — |
| 2025-06-18 | John Sakys | CFO | MIXED | +819 | −$62.35K |
| 2025-06-11 | Brian David Archbold | SVP Operations | E | −2,129 deriv. | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Gary M Owens | President and CEO | 64,135 | $8.33M |
| John James Sullivan | Director | 62,944 | $8.17M |
| John Sakys | CFO | 19,835 | $2.58M |
| Shiraz Shabanali Ladiwala | Director | 12,333 | $1.60M |
| R Tony Tripeny | Director | 9,082 | $1.18M |
| Brian David Archbold | SVP Operations | 8,893 | $1.15M |
| Jennifer Sadie Alltoft | Director | 7,662 | $995.06K |
| Siddhartha Kadia | President and CEO | 7,093 | $921.17K |
| Shannon Hall | Director | 6,973 | $905.58K |
| Mark Christopher Capone | Director | 6,213 | $806.88K |
| Lyndsey Elizabeth Crennen | CAO | 1,598 | $207.53K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the MLAB quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.