144 0001700671 XXXXXXXX LIVE 0000724004 MESA LABORATORIES INC /CO/ 000-11740 12100 W 6TH AVE LAKEWOOD CO 80228 3039878000 Owens Gary M Former Officer Common Fidelity Brokerage Services LLC

900 Salem Street Smithfield RI 02917

20000 2450059.20 5595869 08/21/2026 NASDAQ Common 04/18/2018 Restricted Stock Vesting Issuer N 1000 04/18/2018 Compensation Common 09/01/2022 Restricted Stock Vesting Issuer N 4025 09/01/2022 Compensation Common 06/16/2023 Restricted Stock Vesting Issuer N 629 06/16/2023 Compensation Common 06/15/2024 Restricted Stock Vesting Issuer N 1778 06/15/2024 Compensation Common 10/25/2024 Restricted Stock Vesting Issuer N 3262 10/25/2024 Compensation Common 10/28/2024 Restricted Stock Vesting Issuer N 3228 10/28/2024 Compensation Common 06/15/2025 Restricted Stock Vesting Issuer N 1181 06/15/2025 Compensation Common 06/18/2025 Restricted Stock Vesting Issuer N 4897 06/18/2025 Compensation N Gary M. Owens

12100 West Sixth Avenue Lakewood CO 80228

Common 06/16/2026 3706 375295.50 08/21/2026 /s/ Jennifer Ruchti, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Gary M. Owens