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Preliminary Proxy Statement

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Definitive Proxy Statement

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Soliciting Material under §240.14a-12

HBT Financial, Inc.

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MMMMMMMMMMMM + MMMMMMM C 1234567890 000004 ENDORSEMENT_LINE______________ SACKPACK_____________ MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 ADD 5 ADD 6 Online Go to www.envisionreports.com/HBT or scan the QR code — login details are located in the shaded bar below. Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting of Stockholders of HBT Financial, Inc. to be Held on May 17, 2022 Under Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the annual meeting of stockholders are available on the Internet. Follow the instructions below to view the materials and vote online or request a copy. The items to be voted on and location of the annual meeting are on the reverse side. Your vote is important! This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. The Notice of Annual Meeting of Stockholders, 2022 Proxy Statement, Proxy Card and 2021 Annual Report on Form 10-K are available at: www.envisionreports.com/HBT Easy Online Access — View your proxy materials and vote. Step 1: Step 2: Step 3: Step 4: Step 5: Go to www.envisionreports.com/HBT. Click on Cast Your Vote or Request Materials. Follow the instructions on the screen to log in. Make your selections as instructed on each screen for your delivery preferences. Vote your shares. When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Obtaining a Copy of the Proxy Materials – If you want to receive a copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. Please make your request as instructed on the reverse side on or before May 6, 2022 to facilitate timely delivery. + 2 N O T C O Y 03LRRC MMMMMMMMM Stockholder Meeting Notice 1234 5678 9012 345

The 2022 Annual Meeting of Stockholders of HBT Financial, Inc. will be held on Tuesday, May 17, 2022, 10:00 A.M. Central Time, virtually via the internet at https://meetnow.global/M9PSC57. To access the virtual meeting, you must have the information that is printed in the shaded bar located on the reverse side of this form. Proposals to be voted on at the meeting are listed below along with the Board of Directors’ recommendations. The Board of Directors recommend a vote FOR all the nominees listed in Proposal 1 and FOR Proposal 2. 1.Election of Directors: 01 - Roger A. Baker 02 - C. Alvin Bowman 03 - Eric E. Burwell 04 - Patrick F. Busch 05 - J. Lance Carter 06 - Allen C. Drake 07 - Fred L. Drake 08 - Linda J. Koch 09 - Gerald E. Pfeiffer 2.Ratification of the appointment of RSM US LLP as the independent registered public accounting firm for the year ending December 31, 2022 PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must go online or request a paper copy of the proxy materials to receive a proxy card. Here’s how to order a copy of the proxy materials and select delivery preferences: Current and future delivery requests can be submitted using the options below. If you request an email copy, you will receive an email with a link to the current meeting materials. PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a copy of the proxy materials. — — — Internet – Go to www.envisionreports.com/HBT. Click Cast Your Vote or Request Materials. Phone – Call us free of charge at 1-866-641-4276. Email – Send an email to investorvote@computershare.com with “Proxy Materials HBT Financial, Inc.” in the subject line. Include your full name and address, plus the number located in the shaded bar on the reverse side, and state that you want a paper copy of the meeting materials. To facilitate timely delivery, all requests for a paper copy of proxy materials must be received by May 6, 2022. Stockholder Meeting Notice