SEC Form 4 · accession 0000724004-26-000063
MESA LABORATORIES INC /CO/ · MLAB
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
John Sakys
Officer — CFO
Period of report
Jun 18, 2026
Accepted (ET)
Jun 23, 2026 · 12:23 pm EDT
Rule 10b5-1 plan
box not checked
Issuer CIK
0000724004
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common Stock | Jun 18, 2026 | M | 1,036 | $95.10 | A | 17,574 | D | |
| Common Stock | Jun 18, 2026 | M | 2,756 | $95.10 | A | 20,330 | D | |
| Common StockF5 | Jun 18, 2026 | A | 2,282 | $95.10 | A | 22,612 | D | |
| Common StockF6 | Jun 22, 2026 | S | 2,827 | $89.502 | D | 19,785 | D | |
| Common StockF7 | holding | — | — | — | 50 | I | Custodian |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Restricted Stock Units - 6F1,F2,F3 | — | Jun 18, 2026 | M | 1,036 | D | Jun 21, 2024 | — | Common Stock | 1,036 | 0 | D |
| Restricted Stock Units - 7F1,F4,F3 | — | Jun 18, 2026 | M | 2,756 | D | Jun 18, 2025 | — | Common Stock | 2,756 | 2,755 | D |
Explanation of responses
- F1Each RSU represents a contingent right to receive one share of the Issuer's common stock.
- F2RSUs that vested June 21, 2024 and each of the next two anniversary dates
- F3Not Applicable
- F4RSUs that vest 1/3 on June 15, 2026 and each of the next 2 anniversary dates
- F5Shares represent common stock of Mesa Labs issued upon release of performance share units issued under the FY24-FY26 performance share unit program
- F6Shares sold to cover taxes related to the vesting of RSUs and PSUs on June 18, 2026. Transaction was executed under a 10b5-1 plan.
- F7Consists of 50 shares held by children of which Mr. Sakys is custodian