X0306 4 2020-05-14 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 2020-05-14 4 P 0 20000 9.76 A 142106 D Common Stock 102832 I By trust Represents the volume-weighted average price. These shares were purchased in multiple transactions at prices ranging from $9.50 to $10.14. 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 annual installments beginning on 05/23/2020. /s/ By Michael L. Durham as Attorney-in-Fact for Robert S Beall 2020-05-15