X0306 4 2022-06-01 0 0001137547 UNITED SECURITY BANCSHARES UBFO 0001697577 MACKOVAK BENJAMIN 2126 INYO STREET FRESNO CA 93721 1 0 0 0 Common Stock 2022-06-01 4 M 0 602 A 3183 D Common Stock 2022-06-01 4 J 0 0 A 932491 I By: Strategic Value Investors LP Restricted Stock Units 0 2022-06-01 4 A 0 602 A 2022-06-01 2022-06-01 Common Stock 602 15602 D Restricted Stock Units 7.70 2022-06-01 4 M 0 602 D 2022-06-01 2022-06-01 Common Stock 602 15000 D Represents common stock issued pursuant to the vesting and settlement of 100% of the restricted stock units that were granted on June 1, 2022. Represents a grant of restricted stock units on June 1, 2022, in consideration for service as a member of the Company's Board of Directors. 100% of the restricted stock units were vested on the grant date. Represents the complete vesting of all restricted stock units granted on June 1, 2022. Represents common stock closing price on June 1, 2022. Shares owned directly by Strategic Value Investors LP. Mr. Mackovak, solely by virtue of his position as a managing member of Strategic Value Bank Partners LLC, which serves as the general partner of Strategic Value Investors LP, may be deemed to beneficially own the shares owned directly by Strategic Value Investors LP for purposes of Section 16. Mr. Mackovak expressly disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein. For disclosure purposes only. /s/ Benjamin Mackovak 2022-06-03