Mesa Laboratories Inc (MLAB) · Insider trading
What Mesa Laboratories's directors, officers and largest holders bought and sold themselves, from the Form 4 each of them files with the SEC within two business days of a trade. Open-market purchases and sales first: those are the trades somebody chose to make at the market price.
Bought, 12 months
$1.35M
4 insiders, 5 trades
Sold, 12 months
$1.57M
4 insiders, 16% under a plan
Net, 12 months
−$215,725
bought less sold
Latest filing
2026-08-17
filings read to 2026-10-19
Who traded, two years
| Insider | Bought | Sold | Trades | Last trade | Holds after |
|---|---|---|---|---|---|
| Owens Gary MPresident and CEO | – | $3.36M | 4 | 2025-06-16 | 45,824 |
| Kadia SiddharthaPresident and CEO | $800,090 | – | 1 | 2026-08-13 | – |
| Sullivan John JamesDirector | – | $800,090 | 1 | 2026-08-13 | 17,834 |
| Sakys JohnCFO | – | $439,221 | 3 | 2026-06-22 | 19,785 |
| Archbold Brian DavidSVP Operations | – | $387,584 | 3 | 2026-06-22 | 6,377 |
| Ladiwala Shiraz ShabanaliDirector | $252,805 | – | 1 | 2026-03-10 | 8,523 |
| Tripeny R TonyDirector | $202,261 | – | 2 | 2026-08-13 | 6,298 |
| Capone Mark ChristopherDirector | $99,331 | – | 1 | 2026-03-10 | 3,429 |
| Crennen Lyndsey ElizabethCAO | – | $51,509 | 2 | 2026-06-22 | 2,020 |
Open-market purchases and sales
Newest first. “Plan” marks a trade made under a 10b5-1 plan set up in advance.
| Date | Insider | Trade | Shares | Price | Value | Holds after | Filing |
|---|---|---|---|---|---|---|---|
| 2026-08-13 | Tripeny R TonyDirector | Buy | 900 | 113.69 | $102,321 | 6,298 | Form 4 |
| 2026-08-13 | Kadia SiddharthaPresident and CEO | Buyindirect | 7,093 | 112.80 | $800,090 | 7,093 | Form 4 |
| 2026-08-13 | Sullivan John JamesDirector | Sale | 7,093 | 112.80 | $800,090 | 17,834 | Form 4 |
| 2026-06-22 | Sakys JohnCFO | Sale | 2,827 | 89.50 | $253,016 | 19,785 | Form 4 |
| 2026-06-22 | Archbold Brian DavidSVP Operations | Sale | 2,516 | 89.50 | $225,182 | 6,377 | Form 4 |
| 2026-06-22 | Crennen Lyndsey ElizabethCAO | Sale | 442 | 89.50 | $39,559 | 2,020 | Form 4 |
| 2026-06-16 | Sakys JohnCFO | Saleplan | 1,223 | 101.27 | $123,853 | 16,538 | Form 4 |
| 2026-06-16 | Crennen Lyndsey ElizabethCAO | Saleplan | 118 | 101.27 | $11,950 | 1,473 | Form 4 |
| 2026-06-16 | Archbold Brian DavidSVP Operations | Saleplan | 1,151 | 101.27 | $116,562 | 3,710 | Form 4 |
| 2026-03-10 | Tripeny R TonyDirector | Buy | 1,315 | 76.00 | $99,940 | 5,398 | Form 4 |
| 2026-03-10 | Capone Mark ChristopherDirector | Buy | 1,301 | 76.35 | $99,331 | 3,429 | Form 4 |
| 2026-03-10 | Ladiwala Shiraz ShabanaliDirector | Buy | 3,500 | 72.23 | $252,805 | 8,523 | Form 4 |
| 2025-06-16 | Sakys JohnCFO | Sale | 642 | 97.12 | $62,351 | 12,865 | Form 4 |
| 2025-06-16 | Archbold Brian DavidSVP Operations | Sale | 472 | 97.12 | $45,841 | 558 | Form 4 |
| 2025-06-16 | Owens Gary MPresident and CEO | Sale | 1,939 | 97.12 | $188,316 | 45,824 | Form 4 |
| 2025-03-19 | Owens Gary MPresident and CEO | Saleplan | 21,000 | 123.91 | $2.60M | 43,337 | Form 4 |
| 2024-10-29 | Owens Gary MPresident and CEO | Sale | 2,551 | 111.98 | $285,661 | 43,337 | Form 4 |
| 2024-10-28 | Owens Gary MPresident and CEO | Sale | 2,518 | 113.62 | $286,095 | 45,888 | Form 4 |
Grants, exercises and other transactions
Pay, tax and paperwork rather than a choice to trade at the market price. Two years.
34 × option exercise6 × shares withheld for tax4 × grant or award2 × gift
Show them
| Date | Insider | What | Shares | Price | Holds after | Filing |
|---|---|---|---|---|---|---|
| 2026-08-15 | Sullivan John JamesDirector | Option exercise M | +2,784 | – | 20,618 | Form 4 |
| 2026-08-15 | Tripeny R TonyDirector | Option exercise M | +2,784 | – | 9,082 | Form 4 |
| 2026-08-15 | Hall ShannonDirector | Option exercise M | +2,784 | – | 6,973 | Form 4 |
| 2026-08-15 | Ladiwala Shiraz ShabanaliDirector | Option exercise M | +3,810 | – | 12,333 | Form 4 |
| 2026-08-15 | Alltoft Jennifer SadieDirector | Option exercise M | +2,784 | – | 7,662 | Form 4 |
| 2026-08-15 | Capone Mark ChristopherDirector | Option exercise M | +2,784 | – | 6,213 | Form 4 |
| 2026-06-18 | Sakys JohnCFO | Option exercise M | +1,036 | 95.10 | 17,574 | Form 4 |
| 2026-06-18 | Sakys JohnCFO | Option exercise M | +2,756 | 95.10 | 20,330 | Form 4 |
| 2026-06-18 | Sakys JohnCFO | Grant or award A | +2,282 | 95.10 | 22,612 | Form 4 |
| 2026-06-18 | Archbold Brian DavidSVP Operations | Option exercise M | +844 | 95.10 | 4,554 | Form 4 |
| 2026-06-18 | Archbold Brian DavidSVP Operations | Option exercise M | +2,480 | 95.10 | 7,034 | Form 4 |
| 2026-06-18 | Archbold Brian DavidSVP Operations | Grant or award A | +1,859 | 95.10 | 8,893 | Form 4 |
| 2026-06-18 | Crennen Lyndsey ElizabethCAO | Option exercise M | +125 | 95.10 | 1,598 | Form 4 |
| 2026-06-18 | Crennen Lyndsey ElizabethCAO | Option exercise M | +233 | 95.10 | 1,831 | Form 4 |
| 2026-06-18 | Crennen Lyndsey ElizabethCAO | Option exercise M | +368 | 95.10 | 2,199 | Form 4 |
| 2026-06-18 | Crennen Lyndsey ElizabethCAO | Grant or award A | +263 | 95.10 | 2,462 | Form 4 |
| 2026-06-15 | Sakys JohnCFO | Option exercise M | +2,717 | 104.08 | 17,761 | Form 4 |
| 2026-06-15 | Archbold Brian DavidSVP Operations | Option exercise M | +2,454 | 104.08 | 4,861 | Form 4 |
| 2025-12-02 | Sullivan John JamesDirector | Gift G | −2,000 | – | 25,282 | Form 4 |
| 2025-10-27 | Owens Gary MPresident and CEO | Option exercise M | +11,558 | – | 64,135 | Form 4 |
| 2025-08-15 | Alltoft Jennifer SadieDirector | Option exercise M | +1,404 | – | 4,878 | Form 4 |
| 2025-08-15 | Capone Mark ChristopherDirector | Option exercise M | +1,404 | – | 2,128 | Form 4 |
| 2025-08-15 | Tripeny R TonyDirector | Option exercise M | +1,404 | – | 4,083 | Form 4 |
| 2025-08-15 | Hall ShannonDirector | Option exercise M | +1,404 | – | 4,189 | Form 4 |
| 2025-08-15 | Sullivan John JamesDirector | Option exercise M | +1,404 | – | 27,282 | Form 4 |
| 2025-08-15 | Ladiwala Shiraz ShabanaliDirector | Option exercise M | +1,949 | – | 5,023 | Form 4 |
| 2025-06-21 | Archbold Brian DavidSVP Operations | Option exercise M | +844 | 95.82 | 2,792 | Form 4 |
| 2025-06-21 | Archbold Brian DavidSVP Operations | Shares withheld for tax F | −385 | 95.82 | 2,407 | Form 4 |
| 2025-06-21 | Sakys JohnCFO | Option exercise M | +1,036 | 95.82 | 15,498 | Form 4 |
| 2025-06-21 | Sakys JohnCFO | Shares withheld for tax F | −454 | 95.82 | 15,044 | Form 4 |
| 2025-06-21 | Owens Gary MPresident and CEO | Option exercise M | +3,301 | 95.82 | 54,022 | Form 4 |
| 2025-06-21 | Owens Gary MPresident and CEO | Shares withheld for tax F | −1,445 | 95.82 | 52,577 | Form 4 |
| 2025-06-18 | Sakys JohnCFO | Option exercise M | +2,840 | 92.99 | 15,705 | Form 4 |
| 2025-06-18 | Sakys JohnCFO | Shares withheld for tax F | −1,243 | 92.99 | 14,462 | Form 4 |
| 2025-06-18 | Archbold Brian DavidSVP Operations | Option exercise M | +2,556 | 92.99 | 3,114 | Form 4 |
| 2025-06-18 | Archbold Brian DavidSVP Operations | Shares withheld for tax F | −1,166 | 92.99 | 1,948 | Form 4 |
| 2025-06-18 | Owens Gary MPresident and CEO | Option exercise M | +8,707 | 92.99 | 54,531 | Form 4 |
| 2025-06-18 | Owens Gary MPresident and CEO | Shares withheld for tax F | −3,810 | 92.99 | 50,721 | Form 4 |
| 2025-06-15 | Sakys JohnCFO | Option exercise M | +793 | – | 12,839 | Form 4 |
| 2025-06-15 | Archbold Brian DavidSVP Operations | Option exercise M | +535 | – | 535 | Form 4 |
| 2025-06-15 | Archbold Brian DavidSVP Operations | Option exercise M | +495 | – | 1,030 | Form 4 |
| 2025-06-15 | Owens Gary MPresident and CEO | Option exercise M | +2,324 | – | 43,337 | Form 4 |
| 2025-06-15 | Owens Gary MPresident and CEO | Option exercise M | +2,102 | – | 47,763 | Form 4 |
| 2025-03-19 | Owens Gary MPresident and CEO | Option exercise M | +21,000 | 122.98 | 64,337 | Form 4 |
| 2024-11-19 | Sullivan John JamesDirector | Gift G | −2,000 | – | 25,878 | Form 4 |
| 2024-10-27 | Owens Gary MPresident and CEO | Grant or award A | +11,559 | – | 48,406 | Form 4 |
How to read it
- Buy, sale
- Code P and S on the form: shares bought or sold in the market, at the market price. The other codes are mostly pay (a grant, an option exercised) or tax (shares the company withheld), and say little about what the insider thinks of the price.
- Plan
- A sale or purchase under a Rule 10b5-1 plan, set up in advance and running on its own schedule. Since April 2023 the form has a box for it. Much executive selling is planned and says more about diversifying than about the company.
- Holds after
- The shares the insider still held after the trade, in the form the trade was in (directly, or indirectly through a trust or a fund).
- Value
- Shares times the price the form reports, which is often an average over several fills on the day.
Read from the SEC's own quarterly data sets of Forms 3, 4 and 5, and from each day's filings since the last one. A correcting amendment replaces the lines it restates. Every row links to its filing. None of this is advice: insiders sell for many reasons, and buy for fewer.