MLAB (Mesa Laboratories Inc)
Insider Trading Activity
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.
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.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-17 | Siddhartha Kadia | President and CEO | Buy | — | — |
| 2026-08-17 | R Tony Tripeny | Director | Buy | — | — |
| 2026-08-17 | Mark Christopher Capone | Director | M | — | — |
| 2026-08-17 | R Tony Tripeny | Director | M | — | — |
| 2026-08-17 | Shiraz Shabanali Ladiwala | Director | M | — | — |
| 2026-08-17 | Shannon Hall | Director | M | — | — |
| 2026-08-17 | John James Sullivan | Director | M | — | — |
| 2026-08-17 | Jennifer Sadie Alltoft | Director | M | — | — |
| 2026-08-17 | John James Sullivan | Director | Sell | — | — |
| 2026-06-23 | John Sakys | CFO | MIXED | — | — |
| 2026-06-23 | Lyndsey Elizabeth Crennen | CAO | MIXED | — | — |
| 2026-06-23 | Brian David Archbold | SVP Operations | MIXED | — | — |
| 2026-06-17 | Brian David Archbold | SVP Operations | Sell | — | — |
| 2026-06-17 | John Sakys | CFO | Sell | — | — |
| 2026-06-17 | Lyndsey Elizabeth Crennen | CAO | Sell | — | — |
| 2026-06-16 | Brian David Archbold | SVP Operations | M | — | — |
| 2026-06-16 | John Sakys | CFO | M | — | — |
| 2026-05-19 | Siddhartha Kadia | President and CEO | A | — | — |
| 2026-04-24 | Siddhartha Kadia | President and CEO | A | — | — |
| 2026-04-02 | Gary M Owens | President and CEO | D | — | — |
| 2026-03-10 | Shiraz Shabanali Ladiwala | Director | Buy | — | — |
| 2026-03-10 | R Tony Tripeny | Director | Buy | — | — |
| 2026-03-10 | Mark Christopher Capone | Director | Buy | — | — |
| 2025-12-05 | John James Sullivan | Director | G | — | — |
| 2025-10-28 | Gary M Owens | President and CEO | M | — | — |
| 2025-08-18 | Mark Christopher Capone | Director | M | — | — |
| 2025-08-18 | R Tony Tripeny | Director | M | — | — |
| 2025-08-18 | Jennifer Sadie Alltoft | Director | M | — | — |
| 2025-08-18 | Shiraz Shabanali Ladiwala | Director | M | — | — |
| 2025-08-18 | John James Sullivan | Director | M | — | — |
| 2025-08-18 | Shannon Hall | Director | M | — | — |
| 2025-06-25 | Brian David Archbold | SVP Operations | MIXED | — | — |
| 2025-06-25 | John Sakys | CFO | MIXED | — | — |
| 2025-06-24 | Gary M Owens | President and CEO | MIXED | — | — |
| 2025-06-20 | Brian David Archbold | SVP Operations | MIXED | — | — |
| 2025-06-20 | Gary M Owens | President and CEO | MIXED | — | — |
| 2025-06-20 | John Sakys | CFO | MIXED | — | — |
| 2025-06-18 | Gary M Owens | President and CEO | A | — | — |
| 2025-06-18 | Gary M Owens | President and CEO | MIXED | — | — |
| 2025-06-18 | Brian David Archbold | SVP Operations | MIXED | — | — |
| 2025-06-18 | Brian David Archbold | SVP Operations | A | — | — |
| 2025-06-18 | John Sakys | CFO | A | — | — |
| 2025-06-18 | John Sakys | CFO | MIXED | — | — |
| 2025-06-11 | Brian David Archbold | SVP Operations | E | — | — |
| 2025-06-11 | John Sakys | CFO | E | — | — |
| 2025-06-11 | Gary M Owens | President & CEO | E | — | — |
| 2025-03-24 | Gary M Owens | President and CEO | MIXED | — | — |
| 2024-11-25 | John James Sullivan | Director | G | — | — |
| 2024-10-29 | Gary M Owens | President and CEO | MIXED | — | — |
| 2024-09-16 | Brian David Archbold | SVP Operations | Sell | — | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| — | Director | 200,512 | — |
| — | Director | 190,000 | — |
| — | Former Director | 176,548 | — |
| — | Director | 82,120 | — |
| — | Director | 72,823 | — |
| — | President and CEO | 64,135 | — |
| — | Director | 62,944 | — |
| — | Director | 41,677 | — |
| — | Director | 36,474 | — |
| — | Director | 32,730 | — |
| — | Director | 29,788 | — |
| — | — | 20,152 | — |
| — | CFO | 19,835 | — |
| — | Director | 12,333 | — |
| — | CSMO | 10,000 | — |
| — | Director | 9,082 | — |
| — | SVP Operations | 8,893 | — |
| — | Director | 7,662 | — |
| — | President and CEO | 7,093 | — |
| — | Director | 6,973 | — |
| — | Director | 6,213 | — |
| — | SVP Commercial | 3,084 | — |
| — | Director | 2,618 | — |
| — | CAO | 1,598 | — |
| — | Director | 275 | — |
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.