X0609 4 2026-06-18 0 0000724004 MESA LABORATORIES INC /CO/ MLAB 0002140665 Crennen Lyndsey Elizabeth false 2850 S CLARKSON CIRCLE ENGLEWOOD CO 80113 0 1 0 0 CAO 0 Common Stock 2026-06-18 4 M 0 125 95.1 A 1598 D Common Stock 2026-06-18 4 M 0 233 95.1 A 1831 D Common Stock 2026-06-18 4 M 0 368 95.1 A 2199 D Common Stock 2026-06-18 4 A 0 263 95.1 A 2462 D Common Stock 2026-06-22 4 S 0 442 89.502 D 2020 D Restricted Stock Unit - 1 2026-06-18 4 M 0 125 0 D 2024-06-21 Common Stock 125 0 D Restricted Stock Units - 2 2026-06-18 4 M 0 233 0 D 2025-06-18 Common Stock 233 232 D Restricted Stock Units - 3 2026-06-18 4 M 0 368 0 D 2025-06-19 Common Stock 368 367 D Each RSU represents a contingent right to receive one share of the Issuer's common stock RSUs that vested 1/3 on June 21, 2024 and each of the next two anniversary dates Not Applicable RSUs that vest 1/3 on June 18, 2025 and each of the next two anniversary dates RSUs that vest 1/3 on June 19, 2025 and each of the next 2 anniversary dates Shares represent common stock of Mesa Labs issued upon release of performance share units issued under the FY24-FY26 performance share unit program Shares sold to cover taxes related to the vesting of RSUs and PSUs on June 18, 2026. Transaction was executed under a 10b-1 plan. John Sakys under Power of Attorney by Lyndsey Crennen 2026-06-23