Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark one) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended March 31, 2019 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ____ to ____ 12100 West Sixth Avenue Lakewood, Colorado 80228 (Address of principal executive offices) (Zip Code) Registrant's telephone number, includ ...

Table of Contents United States Securities and Exchange Commission Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITES EXCHANGE ACT OF 1934 For the quarterly period ended December 31, 2018 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITES EXCHANGE ACT OF 1934 For the transition period from ___ to ___ Commission File No: 0-11740 MESA LABORATORIES, INC. (Exact name of registrant as specified in its charter) Colorado 84-0872291 (State or o ...