SEC Form 4 · accession 0000724004-26-000086
MESA LABORATORIES INC /CO/ · MLAB
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
John James Sullivan
Director
Period of report
Aug 15, 2026
Accepted (ET)
Aug 17, 2026 · 5:01 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 | Aug 15, 2026 | M | 2,784 | $0.00 | A | 20,618 | D | |
| Common StockF1 | holding | — | — | — | 45,110 | I | By Trust |
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 - 10F2,F4,F3 | — | Aug 15, 2026 | M | 2,784 | D | — | — | Common Stock | 2,784 | 0 | D |
Explanation of responses
- F1Represents shares held by the "Sullivan Family Trust" for which the reporting person's spouse serves as trustee. The reporting person disclaims beneficial ownership of the securities held by the trust except to the extent of his pecuniary interest therein
- F2Each RSU represents a contingent right to receive one share of the Issuer's common stock
- F3Not Applicable
- F4RSUs that vested on August 15, 2026