Mesa Laboratories, Inc.
A maker of quality-control tools for hospitals, labs, and pharmaceutical companies, Mesa Laboratories builds biological indicators—like its EZTest and Smart-Read lines—that verify sterilization equipment actually kills germs. Founded in Lakewood, Colorado in 1982, it grew from a small instrumentation and calibration shop into a global player through steady acquisitions, including Agena Bioscience and GKE. The name nods to the flat-topped hills common across its home state, a fitting touch for a company rooted in the American West.
Granted 30.1K · Sold 105.0K
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Granted 202.4K · Bought 1.1K · Sold 122.4K
Granted 117.2K · Sold 41.8K
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Granted 23.5K · Bought 150 · Sold 64.3K
Granted 20.3K · Bought 1.5K · Sold 146.6K
Granted 36.0K · Sold 18.7K
Granted 30
Granted 15.1K · Bought 100.0K · Sold 43.7K
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Granted 27.3K · Bought 1.0K · Sold 25.2K
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Granted 11.5K · Bought 2.5K · Sold 11.5K
Granted 989 · Sold 560
Granted 1.0K
Granted 275
Bought 100.0K
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Schmieder Luke RFormer Director · 44 transactions | — | 170.0Kas of Apr 2015 | 30.1K | — | 105.0K |
| Duke Paul DDirector · 21 transactions | — | 72.8Kas of May 2010 | 26.0K | — | 30.0K |
| Sullivan John JamesDirector · 131 transactions | — | 70.1K | 202.4K | 1.1K | 122.4K |
| Owens Gary MPresident and CEO · 47 transactions | — | 64.1K | 117.2K | — | 41.8K |
| Schmieder John BradleyDirector · 36 transactions | — | 62.8Kas of Sep 2023 | 5.3K | — | 28.0K |
| Campbell H StuartDirector · 67 transactions | — | 41.7Kas of Nov 2018 | 23.5K | 150 | 64.3K |
| Dwyer Robert VDirector · 64 transactions | — | 35.9Kas of Apr 2020 | 20.3K | 1.5K | 146.6K |
| Brooks Michael TDirector · 29 transactions | — | 32.7Kas of Jun 2019 | 36.0K | — | 18.7K |
| Mesa Laboratories Inc /Co/Director · 1 transaction | — | 29.8Kas of Jun 2022 | 30 | — | — |
| Guillemin EvanDirector · 51 transactions | — | 29.2Kas of Sep 2022 | 15.1K | 100.0K | 43.7K |
| Peterson Steven WFormer Chief Financial Officer · 31 transactions | — | 26.3Kas of Feb 2013 | 26.9K | — | 54.0K |
| Sakys JohnCFO · 97 transactions | — | 19.8K | 61.7K | — | 37.9K |
| Adriance Glenn ECSMO · 32 transactions | — | 10.0Kas of Jun 2017 | 27.3K | 1.0K | 25.2K |
| Ladiwala Shiraz ShabanaliDirector · 6 transactions | — | 8.5K | 5.0K | 3.5K | — |
| Archbold Brian DavidSVP Operations · 57 transactions | — | 6.4K | 22.9K | — | 13.0K |
| Tripeny R TonyDirector · 5 transactions | — | 5.4K | 3.6K | 1.8K | — |
| Alltoft Jennifer SadieDirector · 8 transactions | — | 4.9Kas of Aug 2025 | 4.9K | — | — |
| Dinoia GregorySVP Commercial · 24 transactions | — | 4.2Kas of Jun 2022 | 7.2K | — | 4.3K |
| Hall ShannonDirector · 8 transactions | — | 4.2Kas of Aug 2025 | 4.4K | — | 230 |
| Capone Mark ChristopherDirector · 3 transactions | — | 3.4K | 2.1K | 1.3K | — |
| Kelly David MDirector · 54 transactions | — | 2.6Kas of Nov 2021 | 11.5K | 2.5K | 11.5K |
| Crennen Lyndsey ElizabethCAO · 6 transactions | — | 2.0K | 989 | — | 560 |
| Sakys John VCFO · 1 transaction | — | 1.0Kas of Dec 2015 | 1.0K | — | — |
| Perez David BrianDirector · 1 transaction | — | 275as of Nov 2019 | 275 | — | — |
| SEG Ventures, LLCReporting owner · 6 transactions | — | 0as of Sep 2018 | — | 100.0K | — |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over all recorded history: -534.4K shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.