SCHEDULE 13G 0001748049 XXXXXXXX LIVE Common Stock, no par value 03/11/2026 0000724004 Mesa Laboratories, Inc. 59064R109 12100 West Sixth Ave. Lakewood CO 80228 Rule 13d-1(c) Long Path Smaller Companies Fund, LP DE 0.00 311703 0.00 311703 311703 N 5.6 PN Long Path Fund GP, LLC DE 0.00 311703 0.00 311703 311703 N 5.6 OO Long Path Partners, LP DE 0.00 311703 0.00 311703 311703 N 5.6 IA PN Long Path Holdings LLC DE 0.00 311703 0.00 311703 311703 N 5.6 OO William Thomas Brennan X1 0.00 311703 0.00 311703 311703 N 5.6 IN HC Brian Paul Nelson X1 0.00 311703 0.00 311703 311703 N 5.6 IN HC Mesa Laboratories, Inc. 12100 West Sixth Ave., Lakewood, CO 80228 This Schedule 13G is filed by (i) Long Path Smaller Companies Fund, LP (the "Fund"), (ii) Long Path Fund GP, LLC (the "Fund GP"), as the general partner of the Fund, (iii) Long Path Partners, LP (the "Adviser"), as the investment adviser to the Fund, (iv) Long Path Holdings LLC (the "Adviser GP"), as the general partner of the Adviser, (v) William Thomas Brennan, as the managing member of the Fund GP and the Adviser GP and co-portfolio manager of the Fund, and (vi) Brian Paul Nelson, as co-portfolio manager of the Fund and a member of the Adviser GP (each, a "Reporting Person" and collectively, the "Reporting Persons"). The agreement among the Reporting Persons to file the Schedule 13G jointly (the "Joint Filing Agreement") is filed herewith as Exhibit A. The shares reported herein are directly held by the Fund and each Reporting Person disclaims beneficial ownership of such shares except to the extent of its or his pecuniary interest therein. c/o Long Path Partners, 1 Landmark Square, Suite 1920, Stamford, CT 06901 The Fund is a Delaware limited partnership. The Fund GP is a Delaware limited liability company. The Adviser is a Delaware limited partnership. The Adviser GP is a Delaware limited liability company. William Thomas Brennan and Brian Paul Nelson are citizens of the United States. Y The information required by this paragraph is set forth in the cover pages to this Schedule 13G and is incorporated herein by reference. The information required by this paragraph is set forth in the cover pages to this Schedule 13G and is incorporated herein by reference. Percentage ownership is based on 5,524,813 shares of Common Stock outstanding as of January 31, 2026, as reported in the Issuer's Report on Form 10-Q for the period ended December 31, 2025 filed with the Securities and Exchange Commission on February 3, 2026. The information required by this paragraph is set forth in the cover pages to this Schedule 13G and is incorporated herein by reference. The information required by this paragraph is set forth in the cover pages to this Schedule 13G and is incorporated herein by reference. The information required by this paragraph is set forth in the cover pages to this Schedule 13G and is incorporated herein by reference. The information required by this paragraph is set forth in the cover pages to this Schedule 13G and is incorporated herein by reference. Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. Exhibit A - Joint Filing Agreement Long Path Smaller Companies Fund, LP /s/ William Thomas Brennan 03/13/2026 Long Path Fund GP, LLC /s/ William Thomas Brennan 03/13/2026 Long Path Partners, LP /s/ William Thomas Brennan 03/13/2026 Long Path Holdings LLC /s/ William Thomas Brennan 03/13/2026 William Thomas Brennan /s/ William Thomas Brennan 03/13/2026 Brian Paul Nelson /s/ Brian Paul Nelson 03/13/2026