X0306 4 2021-01-01 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 2021-01-01 4 M 0 1550 A 6231.8108 D Common Shares 2021-01-01 4 M 0 829 A 7060.8108 D Common Shares 2021-01-01 4 M 0 680 A 7740.8108 D Restricted Stock Units 2021-01-01 4 M 0 680 D Common Shares 680 0 D Restricted Stock Units 2021-01-01 4 M 0 829 D Common Shares 829 829 D Restricted Stock Units 2021-01-01 4 M 0 1550 D Common Shares 1550 3100 D Restricted Stock Units 2021-01-01 4 A 0 5372 A Common Shares 5372 5372 D Represents common shares issued upon vesting of an equal number of restricted stock units. Each restricted stock unit represents a contingent right to receive one of the Issuer's common shares. On March 1, 2018, the reporting person was granted 2040 restricted stock units, vesting in three equal installments beginning January 1, 2019. On January 1, 2019, the reporting person was granted 2488 restricted stock units, vesting in three equal annual installments beginning January 1, 2020. On January 1, 2020, the reporting person was granted 4648 restricted stock units, vesting in three equal annual installments beginning January 1, 2021. On January 1, 2021, the reporting person was granted 5372 restricted stock units, vesting in three equal annual installments beginning January 1, 2022. /s/ Mark K. Olson, by Adelaide Maudsley, Attorney In Fact 2021-01-04