X0306 4 2019-03-26 0 0001499453 Spirit of Texas Bancshares, Inc. STXB 0001107072 BEALL ROBERT S 1836 SPIRIT OF TEXAS WAY CONROE TX 77301 1 0 0 0 Common Stock 2019-03-26 4 W 0 1403 0 A 102832 I By trust Common Stock 2020-03-13 4 P 0 11019 12.4 A 97106 D Common Stock 2020-03-16 4 P 0 15000 11.77 A 112106 D Shares inherited by the Reporting Person on 3/26/2019 are being reported late. The Reporting Person's Form 4s filed since 3/26/2019 underreported his ownership by 1,403 shares. Represents the volume-weighted average price. These shares were purchased in multiple transactions at prices ranging from $12.14 to $12.50. Upon request by the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer, the Reporting Person undertakes to provide full information regarding the number of shares purchased at each separate price. Includes 1,000 restricted stock units, which will vest in five equal installments beginning on May 23, 2020. Represents the volume-weighted average price. These shares were purchased in multiple transactions at prices ranging from $11.59 to $11.78. Upon request by the staff of the Securities and Exchange Commission, the Issuer or any security holder of the Issuer, the Reporting Person undertakes to provide full information regarding the number of shares purchased at each separate price. The Reporting Person's Form 4 filed on 03/16/2020 incorrectly understated by 11,019 shares the Reporting Person's direct holdings, which shares were purchased by the Reporting Person on 3/13/2020 and are being reported herein on this Form 4. /s/ By Michael L. Durham as Attorney-in-Fact for Robert S Beall 2020-04-09