X0306 4 2021-05-17 0 0001636286 Altabancorp ALTA 0001496892 Olson Mark K 1 EAST MAIN STREET AMERICAN FORK UT 84003 0 1 0 0 EVP/Chief Financial Officer Common Shares 2021-05-17 4 P 0 27.0493 0.00 A 7820.695 D Common Shares 2021-05-17 4 P 0 6.957 0.00 A 1955.957 I Olson Family Trust Common Shares 2021-05-17 4 P 0 2.9342 0.00 A 852.9816 I Altabancorp ESOP Represents shares acquired pursuant to dividend reinvestment. Represents the reinvestment of certain dividends received by the Company's Employee Stock Ownership Plan that were reinvested in common shares of the Company and allocated to the Reporting Person. The allocation to the Reporting Person is exempt from Section 16(b) of the Exchange Act pursuant to Rule 16-3(c) thereunder. /s/ Mark K. Olson, by Adelaide Maudsley, Attorney In Fact 2021-05-19