As of the latest Form 4 filed Jun 23, 2026.
What Mesa Laboratories Inc insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 18 most recent filings for MLAB.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-06-23 | 2026-06-22 | Crennen Lyndsey Elizabeth CAO | SSale | −442.00 | $89.50 | $39.6K | No | Form 4 ↗ |
| 2026-06-23 | 2026-06-22 | Archbold Brian David SVP Operations | SSale | −2.52K | $89.50 | $225K | No | Form 4 ↗ |
| 2026-06-23 | 2026-06-22 | Sakys John CFO | SSale | −2.83K | $89.50 | $253K | No | Form 4 ↗ |
| 2026-06-23 | 2026-06-18 | Crennen Lyndsey Elizabeth CAO | AAward | +263.00 | $95.10 | $25.0K | No | Form 4 ↗ |
| 2026-06-23 | 2026-06-18 | Crennen Lyndsey Elizabeth, CAO | MExercise | +368.00 | $95.10 | $35.0K | No | Form 4 ↗ |
| 2026-06-23 | 2026-06-18 | Crennen Lyndsey Elizabeth, CAO | MExercise | +233.00 | $95.10 | $22.2K | No | Form 4 ↗ |
| 2026-06-23 | 2026-06-18 | Crennen Lyndsey Elizabeth, CAO | MExercise | +125.00 | $95.10 | $11.9K | No | Form 4 ↗ |
| 2026-06-23 | 2026-06-18 | Archbold Brian David SVP Operations | AAward | +1.86K | $95.10 | $177K | No | Form 4 ↗ |
| 2026-06-23 | 2026-06-18 | Archbold Brian David, SVP Operations | MExercise | +2.48K | $95.10 | $236K | No | Form 4 ↗ |
| 2026-06-23 | 2026-06-18 | Archbold Brian David, SVP Operations | MExercise | +844.00 | $95.10 | $80.3K | No | Form 4 ↗ |
| 2026-06-23 | 2026-06-18 | Sakys John CFO | AAward | +2.28K | $95.10 | $217K | No | Form 4 ↗ |
| 2026-06-23 | 2026-06-18 | Sakys John, CFO | MExercise | +2.76K | $95.10 | $262K | No | Form 4 ↗ |
| 2026-06-23 | 2026-06-18 | Sakys John, CFO | MExercise | +1.04K | $95.10 | $98.5K | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-16 | Archbold Brian David SVP Operations | SSale | −1.15K | $101.27 | $117K | Yes (planned) | Form 4 ↗ |
| 2026-06-17 | 2026-06-16 | Crennen Lyndsey Elizabeth CAO | SSale | −118.00 | $101.27 | $11.9K | Yes (planned) | Form 4 ↗ |
| 2026-06-17 | 2026-06-16 | Sakys John CFO | SSale | −1.22K | $101.27 | $124K | Yes (planned) | Form 4 ↗ |
| 2026-06-16 | 2026-06-15 | Archbold Brian David SVP Operations | MExercise | +2.45K | $104.08 | $255K | No | Form 4 ↗ |
| 2026-06-16 | 2026-06-15 | Sakys John CFO | MExercise | +2.72K | $104.08 | $283K | No | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also MLAB’s full analysis or the market-wide insider trading feed. The tabs above jump to MLAB’s other SEC data.
Source: SEC Form 4 filings for MLAB, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.