X0306 4 2020-10-20 0 0001642081 Allegiance Bancshares, Inc. ABTX 0001754480 Williams Roland L. 8847 W. SAM HOUSTON PKWY. NORTH SUITE 200 HOUSTON TX 77040 1 0 0 0 Common Stock 2020-10-20 4 S 0 2500 26.2309 D 112527 D Common Stock 2020-10-21 4 S 0 2500 26.5016 D 110027 D Common Stock 3492 I By ESOP The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 12, 2020. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.12 to $26.385, inclusive. The reporting person undertakes to provide to Allegiance Bancshares, Inc., any security holder of Allegiance Bancshares, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnotes (2) and (3) hereto. These shares were sold in multiple transactions at prices ranging from $26.20 to $26.715, inclusive. /s/Shanna Kuzdzal, Attorney-in-fact 2020-10-22