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 11.6K
Granted 8.8K · Sold 4.0K
Bought 3.5K
Granted 7.6K · Sold 3.7K
Bought 1.3K
Bought 1.3K
Granted 989 · Sold 560
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Sullivan John JamesDirector · 1 transaction | -2.8% | 70.1K | — | — | — |
| Owens Gary MPresident and CEO · 1 transaction | +18.7% | 64.1K | 11.6K | — | — |
| Sakys JohnCFO · 6 transactions | +27.2% | 19.8K | 8.8K | — | 4.0K |
| Ladiwala Shiraz ShabanaliDirector · 1 transaction | +69.7% | 8.5K | — | 3.5K | — |
| Archbold Brian DavidSVP Operations · 6 transactions | +128.4% | 6.4K | 7.6K | — | 3.7K |
| Tripeny R TonyDirector · 1 transaction | +32.2% | 5.4K | — | 1.3K | — |
| Capone Mark ChristopherDirector · 1 transaction | +61.1% | 3.4K | — | 1.3K | — |
| Crennen Lyndsey ElizabethCAO · 6 transactions | — | 2.0K | 989 | — | 560 |
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 the last year: -2.2K shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.