X0607 3 2026-06-15 0 0000724004 MESA LABORATORIES INC /CO/ MLAB 0002140665 Crennen Lyndsey Elizabeth false 2850 S CLARKSON CIRCLE ENGLEWOOD CO 80113 0 1 0 0 Chief Accounting Officer Common Stock 1863 D Restricted Stock Unit - 1 0 2026-06-21 Common Stock 125 D Restricted Stock Unit - 2 0 2026-06-18 Common Stock 465 D Restricted Stock Units - 3 0 2026-06-19 Common Stock 735 D Restricted Stock Units 0 2027-06-13 Common Stock 542 D Restricted Stock Units - 5 0 2027-03-02 Common Stock 1800 D Restricted Stock Units 6 0 2027-06-15 Common Stock 1443 D NSO -1 268.85 2022-09-01 2027-09-01 Common Stock 369 D NSO - 2 185.57 2025-06-15 2028-06-15 Common Stock 488 D NSO - 3 131.67 2024-06-21 2029-06-21 Common Stock 646 D Last tranche of the grant vests on June 21, 2026 Not Applicable Each RSU represents a contingent right to receive one share of the Issuer's common stock RSUs that vest 233 shares on June 18, 2026 and 232 shares that vest on June 18, 2027 RSUs that vest 368 shares on June 19, 2026 and 367 shares that vest on June 19, 2027 RSUs that vest 271 shares on June 13, 2027 and 271 shares on June 13, 2028 RSUs that vest 612 shares on March 2, 2027 and 594 shares that vest on each of March 2, 2028 and March 2, 2029 RSUs that vest 34% on June 15, 2027, 33% on June 8, 2028 and 33% on June 8, 2029 Non qualified stock options that were fully vested as of June 15, 2024 Non qualified stock options that were fully vested as of June 15, 2025 NSO's that will fully vest on June 21, 2026 John Sakys under Power of Attorney by Lyndsey Crennen 2026-06-16