SEC Form 4 · accession 0000724004-26-000057
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 15, 2026
Accepted (ET)
Jun 16, 2026 · 2:15 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 15, 2026 | M | 2,717 | $104.08 | A | 17,761 | D | |
| Common StockF6 | 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Non Qualified Stock OptionF1 | $226.72 | Jun 15, 2026 | E | 3,951 | D | Jun 15, 2021 | Jun 15, 2026 | Common Stock | 3,951 | 15,755 | D |
| Restricted Stock Units 8F2,F3,F4 | — | Jun 15, 2026 | M | 2,717 | D | — | — | Common Stock | 2,717 | 5,416 | D |
| Restricted Stock Units - 9F2,F5,F4 | — | Jun 15, 2026 | A | 8,416 | A | Jun 15, 2027 | — | Common Stock | 8,416 | 8,416 | D |
Explanation of responses
- F1NSOs that vested 1/3 on each anniversary date of the June 15, 2020 grant date
- F2Each RSU represents a contingent right to receive one share of the Issuer's common stock
- F3RSUs that vest 1/3 on June 15, 2026 and each of the next two anniversary dates
- F4Not Applicable
- F5RSUs that vest 34% on June 15, 2027, 33% on June 8, 2028 and 33% on June 8, 2029
- F6Consists of 50 shares held by children on which Mr. Sakys is custodian