Other Information
−Removed: During the three months ended December 31, 2025 , none of our directors or officers entered into new or amended written plans for the purchase or sale of our securities intended to satisfy the affirmative defense conditions of Exchange Act Rule 10b5 - 1 (c).
+Added: During the quarter ended March 31, 2026 , each of Chief Financial Officer John V.
+Added: Sakys , Senior Vice President of Continuous Improvement Brian Archbold , and Chief Accounting Officer Lyndsey Crennen entered into a written plan for the sale of Mesa's securities intended to satisfy the affirmative defense conditions of Exchange Act Rule 10b5 - 1 (c) (each, a "Rule 10b5 - 1 trading arrangement").
+Added: Each Rule 10b5 - 1 trading arrangement was adopted on March 12, 2026 solely to satisfy tax withholding obligations arising from the vesting of equity awards and expired on June 30, 2026 .
+Added: The Rule 10b5 - 1 trading arrangements provided for the sale of approximately 4,095 , 3,695 and 554 shares of Mesa's common stock for Messrs.
+Added: Sakys and Archbold and Ms.
+Added: Crennen, respectively.
Description of Exhibit
3 unchanged sentences
(incorporated by reference from Exhibit 3.1 to the Company's Current Report on Form 8-K filed May 10, 2019).
−Removed: Amended and Restated Credit Agreement, dated as of April 5, 2024, by and among the Company, the guarantors and lenders party thereto, JPMorgan Chase Bank, N.A., as administrative agent, and the joint lead arrangers and joint bookrunners party thereto (incorporated by reference from Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q filed November 6, 2025.)
−Removed: Mesa Laboratories, Inc Amended and Restated 2021 Equity Incentive Plan (incorporated by reference from Exhibit 10.2.3 to the Company's Quarterly Report on Form 10-Q filed November 6, 2025).
+Added: Form of Employment Agreement by and among Mesa Laboratories, Inc.
+Added: and Lyndsey Crennen (incorporated by reference from Exhibit 10.1 to the Company’ s Current Report on Form 8-K filed on June 15, 2026).
Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
13 unchanged sentences
MESA LABORATORIES, INC.
−Removed: February 3, 2026
+Added: August 10, 2026
+Added: /s/ Siddhartha Kadia, Ph.D .
+Added: Siddhartha Kadia
Chief Executive Officer
−Removed: February 3, 2026
+Added: August 10, 2026
Chief Financial Officer
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.