Shareholder Vote

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ​ FORM  8-K ​ CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 ​ Date of Report (Date of earliest event reported): May 1, 2026 ​ UNITED STATES LIME & MINERALS, INC. (Exact name of registrant as specified in its charter) ​ ​ ​ ​ ​ ​ TEXAS ​ 0-4197 ​ 75-0789226 (State or other jurisdiction of ​ (Commission File Number) ​ (IRS Employer Identification No.) incorporation) ​ ​ ​ ​ ​ ​ ​ ​ ​ 5429 LBJ FREEWAY, SUITE 230 , DALLAS , TEXAS ​ 75240 (Address of principal executive offices) ​ (Zip Code) ​ ( 972 ) 991-8400 (Registrant’s telephone number, including area code) ​ (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below): ​ ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ​ ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ​ ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ​ ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of each exchange on which registered Common stock, $0.10 par value USLM The NASDAQ Stock Market LLC Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ ​ ​ ​ Item 5.07. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS. ​ At the Annual Meeting, the Company’s shareholders voted on two proposals as described in the 2026 Annual Meeting Proxy Statement.  The voting results for these proposals were as follows:   ​ Proposal 1 ​ The following seven directors were elected to serve until the 2027 Annual Meeting of Shareholders and until their respective successors have been duly elected and qualified as set forth below: ​ Directors   ​ ​ ​ FOR   ​ ​ ​ WITHHELD   ​ ​ ​ BROKER NON- VOTES   Timothy W. Byrne ​ 26,344,723 ​ 48,530 ​ 2,276,803 ​ Richard W. Cardin ​ 24,017,908 ​ 2,375,345 ​ 2,276,803 ​ Antoine M. Doumet ​ 23,201,449 ​ 3,191,804 ​ 2,276,803 ​ Sandra C. Duhé ​ 25,180,084 ​ 1,213,169 ​ 2,276,803 ​ Tom S. Hawkins, Jr. ​ 23,949,622 ​ 2,443,631 ​ 2,276,803 ​ Lila R. Weirich ​ 25,239,929 ​ 1,153,324 ​ 2,276,803 ​ Jon A. Wolkenstein ​ 25,550,037 ​ 843,216 ​ 2,276,803 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Proposal 2 ​ Shareholders approved, on a non-binding advisory basis, the Company’s executive compensation as set forth below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​   ​ ​ ​   ​ ​ ​   ​ ​ ​   ​ ​ ​   ​ ​ ​ BROKER NON-   FOR ​ AGAINST ​ ABSTAIN ​ VOTES ​ 23,189,104 ​ 3,189,487 ​ 14,662 ​ 2,276,803 ​ 2 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2 ​ SIGNATURES ​ Pursuant to the requirements of the Securities Exchange Act of 1934, United States Lime & Minerals, Inc. has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. ​ ​ ​ ​ Date: May 4, 2026 UNITED STATES LIME & MINERALS, INC. ​ ​ ​ By:  /s/ Michael L. Wiedemer ​ ​ Michael L. Wiedemer, Vice President and ​ ​ Chief Financial Officer ​ ​ ​ 3