联合安全银行 2025年度报告

☒ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THEFISCAL YEAR ENDED DECEMBER31, 2025.☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FORTHE TRANSITION PERIOD FROMTO. Commission file number: 000-32987UNITED SECURITY BANCSHARES (Exact name of registrant as specified in its charter) Registrant’s telephone number, including area code(888) 683-6030 Securities registered pursuant to Section 12(b) of the Act:Common Stock, no par value UBFONasdaq(Title of Class)(Trading Symbol) (Exchange)Securities registered pursuant to Section 12(g) of the Act:NONE Indicate by check mark whether the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes☐No☒ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Securities Act. Yes☐No☒ Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Actof 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has beensubject to such filing for the past 90 days. Yes☒No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted and postedpursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrantwas required to submit such files). Yes☒No☐ Indicate by check mark if disclosure of delinquent filers pursuant to item 405 of Regulation S-K is not contained herein, and will not becontained, to the best of the registrants knowledge, in the definitive proxy or information statements incorporated by reference in Part III of thisform 10-K or any amendment to this Form 10-K.☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a small reportingcompany, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,”and “emerging growth company” in Rule 12b-2 of the Exchange Act. Large accelerated filer☐Accelerated filer☐Non-accelerated filer☒Small reporting company☒Emerging growth company☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complyingwith any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of itsinternal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered publicaccounting firm that prepared or issued its audit report.☐ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrantincluded in the filing reflect the correction of an error to previously issued financial statements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-basedcompensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes☐No☒ Aggregate market value of the Common Stock held by non-affiliates as of the last business day of the registrant’s most recently completedsecond fiscal quarter - June30, 2025: $104,165,322 Shares outstanding as of March24, 2026:17,255,505 UNITED SECURITY BANCSHARESTABLE OF CONTENTS PART I:Item 1 - Business4Item 1A - Risk Factors18Item 1B – Unresolved Staff Comments18Item 1C - Cybersecurity18Item 2 - Properties19Item 3 - Legal Proceedings19Item 4 – Mine Safety Disclosures19PART II:Item 5 - Market for the Registrant’s Common Equity, Related Stockholder Matters, and Issuer Purchases of EquitySecurities20Item 6 - [Reserved]21Item 7 - Management’s Discussion and Analysis of Financial Condition and Results of Operations21Item 7A - Quantitative and Qualitative Disclosures about Market Risk43Item 8 - Financial Statements and Supplementary Data44Item 9 - Changes in and Disagreements with Accountants on Accounting and Financial Disclosure89Item 9A – Controls and Procedures89Item 9B – Other Information90Item 9C – Disclosures Regarding Foreign Jurisdictions that Prevent Inspections90PART III:Item 10 – Directors, Executive Officers, and Corporate Governance90Item 11 - Executive Compensation98Item 12 - Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters109Item 13 - Certain Relationships and Related Transactions, and Director Independence111Item 14 – Pr