USLM United States Lime and Minerals Inc

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Preliminary Proxy Statement

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Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

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Definitive Proxy Statement

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Definitive Additional Materials

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Soliciting Material under §240.14a-12

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UNITED STATES LIME & MINERALS, INC.

(Name of Registrant as Specified In Its Charter)

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(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

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No fee required.

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Fee paid previously with preliminary materials.

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Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

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UNITED STATES LIME & MINERALS, INC.

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Timothy W. Byrne

Dallas, Texas

President and Chief Executive Officer

April 3, 2023

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3. To approve a non-binding advisory vote on the frequency of holding the non-binding advisory vote on executive compensation. 1 Year 2 Years 3 Years Abstain Proposals — The Board of Directors recommend a vote FOR all the nominees listed, FOR Proposals X – X and for every X YEARS on Proposal X. 1 U P X Mark here to vote FOR all nominees 01 - T. W. Byrne 02 - R. W. Cardin 03 - A. M. Doumet 04 - S. C. Duhé 05 - T. S. Hawkins, Jr. 06 - B. R. Hughes Mark here to WITHHOLD vote from all nominees For All EXCEPT - To withhold authority to vote for any nominee(s), write the name(s) of such nominee(s) below. _____________________________________________________________________ United States Lime and Minerals, Inc. Using a black ink pen, mark your votes with an X as shown in this example. Please do not write outside the designated areas. 03S4FE + + 1. To elect Directors — Nominees: For Against Abstain Please sign exactly as name(s) appears hereon. Joint owners should each sign. When signing as attorney, executor, administrator, corporate officer, trustee, guardian, or custodian, please give full title. Date (mm/dd/yyyy) — Please print date below. Signature 1 — Please keep signature within the box. Signature 2 — Please keep signature within the box. B Authorized Signatures — This section must be completed for your vote to count. Please date and sign below. q IF VOTING BY MAIL, SIGN, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE. q Annual Meeting Amended Proxy Card 2. To approve a non-binding advisory vote on executive compensation. In their discretion, the proxies are authorized to vote upon such other business as may properly be brought before the Annual Meeting or any adjournment thereof. Matters to be voted upon – The Board of Directors Recommends a vote FOR all director nominees, FOR proposal 2 and for the approval of the 1 Year (annual) frequency option for holding the non-binding advisory vote on executive compensation. A THIS PROXY HAS BEEN REVISED TO REFLECT THE NEW PROPOSAL 3. 000004 MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 ADD 5 ADD 6 ENDORSEMENT_LINE______________ SACKPACK_____________ 1234 5678 9012 345 M M M M M M M M M MMMMMMMMMMMMMMM 5 7 3 9 5 7 MR A SAMPLE (THIS AREA IS SET UP TO ACCOMMODATE 140 CHARACTERS) MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND MR A SAMPLE AND C 1234567890 J N T C123456789 MMMMMMMMMMMM M MMMMMMM 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext 000000000.000000 ext If no electronic voting, delete QR code and control # ∆ ≈ You may vote online or by phone instead of mailing this card. Online Go to www.investorvote.com/USLM or scan the QR code — login details are located in the shaded bar below Save paper, time and money! Sign up for electronic delivery at www.investorvote.com/USLM Phone Call toll free 1-800-652-VOTE (8683) within the USA, US territories and Canada Votes submitted electronically must be received by 1:00 a.m., Local Time, on May 5, 2023 Your vote matters – here’s how to vote!

Small steps make an impact. Help the environment by consenting to receive electronic delivery, sign up at www.investorvote.com/USLM Proxy Solicited by Board of Directors for Annual Meeting — May 5, 2023 The undersigned hereby appoints Antoine M. Doumet and Timothy W. Byrne, and either of them, proxies, with power of substitution in each, and hereby authorizes them to represent and to vote, as designated below, all shares of Common Stock of UNITED STATES LIME & MINERALS, INC. standing in the name of the undersigned on March 17, 2023, at the Annual Meeting of Shareholders to be held on May 5, 2023, at the Residence Inn Dallas by the Galleria, 5460 James Temple Drive, Dallas, Texas 75240, and at any adjournment thereof, and especially to vote on the items of business specified below, as more fully described in the Amended Notice of the Annual Meeting dated April 3, 2023, and the Proxy Statement and the Proxy Statement Supplement, the receipt of which is hereby acknowledged. You are encouraged to record your vote on the following items of business to be brought before the Annual Meeting, but you need not mark any box on this proxy card if you wish to vote in accordance with the Board of Directors’ recommendations. The proxies cannot vote your shares unless you sign, date, and return this proxy card. Remember, you can revoke your proxy by voting through the Internet or by telephone at a later date, by attending the Annual Meeting and voting in person, or by submitting to the Company, prior to the Annual Meeting, a written notice of revocation or a later dated signed proxy card. YOUR VOTE IS IMPORTANT! PLEASE MARK, SIGN, AND DATE THIS PROXY CARD AND RETURN IT PROMPTLY IN THE ACCOMPANYING ENVELOPE. (Continued and to be signed on reverse side.) Proxy — United States Lime and Minerals, Inc. q IF VOTING BY MAIL, SIGN, DETACH AND RETURN THE BOTTOM PORTION IN THE ENCLOSED ENVELOPE. q C Non-Voting Items + + Change of Address — Please print new address below.