SEC Form 4 · accession 0000724004-26-000064
MESA LABORATORIES INC /CO/ · MLAB
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Brian David Archbold
Officer — SVP Operations
Period of report
Jun 18, 2026
Accepted (ET)
Jun 23, 2026 · 1:02 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 | 844 | $95.10 | A | 4,554 | D | |
| Common Stock | Jun 18, 2026 | M | 2,480 | $95.10 | A | 7,034 | D | |
| Common StockF5 | Jun 18, 2026 | A | 1,859 | $95.10 | A | 8,893 | D | |
| Common Stock | Jun 22, 2026 | S | 2,516 | $89.502 | D | 6,377 | D |
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 - 7F1,F2,F3 | — | Jun 18, 2026 | M | 844 | D | Jun 21, 2024 | — | Common Stock | 844 | 0 | D |
| Restricted Stock Units - 8F1,F3,F4 | — | Jun 18, 2026 | M | 2,480 | D | — | Jun 18, 2025 | Common Stock | 2,480 | 2,480 | 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