FORM 10-Q Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the quarterly period ended: March31, 2026 Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the transition period fromto Commission File Number: 000-10661___________________ (Exact Name of Registrant as Specified in Its Charter)___________________ 94-2792841(I.R.S. EmployerIdentification Number) 63 Constitution DriveChico, California 95973(Address of Principal Executive Offices)(Zip Code) (530) 898-0300(Registrant’s Telephone Number, Including Area Code) Name of each exchangeon which registered The NASDAQ Stock Market Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the SecuritiesExchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports),and (2) has been subject to such filing requirements 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 pursuantto 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 whether the registrant is a large accelerated filer, an accelerated filer, non-accelerated filer, a smaller reportingcompany, or an emerging growth company. See definitions of “accelerated filer”, “large accelerated filer”, “smaller reporting company”and “emerging growth company” in Rule 12b-2 of the Exchange Act. ☐Acceleratedfiler☐Smallerreportingcompany Large accelerated filerNon-accelerated filerEmerginggrowthcompany If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period forcomplying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).☐Yes☒No Indicate the number of shares outstanding for each of the issuer’s classes of common stock, as of the latest practical date:Common stock, no par value: 31,910,590 shares outstanding as of May 1, 2026. TriCo BancsharesFORM 10-QTABLE OF CONTENTS PART I – FINANCIAL INFORMATIONItem 1 – Financial Statements (Unaudited)Item 2 – Management’s Discussion and Analysis of Financial Condition and Results of OperationsItem 3 – Quantitative and Qualitative Disclosures about Market RiskItem 4 – Controls and ProceduresPART II – OTHER INFORMATIONItem 1 – Legal ProceedingsItem 1A – Risk FactorsItem 2 – Unregistered Sales of Equity Securities and Use of ProceedsItem 5 – Other InformationItem 6 – ExhibitsSignatures GLOSSARY OF ACRONYMS AND TERMS The following listing provides a comprehensive reference of common acronyms and terms used throughout the document: ACLAllowance for Credit LossesAFSAvailable-for-SaleAOCIAccumulated Other Comprehensive IncomeASCAccounting Standards CodificationCDsCertificates of DepositCDICore Deposit IntangibleCRECommercial Real EstateCMOCollateralized Mortgage ObligationCODMChief Operating Decision MakerDFPIState Department of Financial Protection and InnovationFASBFinancial Accounting Standards BoardFDICFederal Deposit Insurance CorporationFHLBFederal Home Loan BankFOMCFederal Open Market CommitteeFRBFederal Reserve BoardFTEFully taxable equivalentGAAPGenerally Accepted Accounting Principles (United States of America)HELOCHome equity line of creditHTMHeld-to-MaturityLIBORLondon Interbank Offered RateNIMNet interest marginNPANonperforming assetsOCIOther comprehensive incomePCDPurchase Credit DeterioratedPSUPerformance Restricted Stock UnitROUARight-of-Use AssetRSURestricted Stock UnitSBASmall Business AdministrationSERPSupplemental Executive Retirement PlanSFRSingle Family ResidenceSOFRSecured Overnight Financing RateXBRLeXtensible Business Reporting Language PART I – FINANCIAL INFORMATIONFinancial Statements (unaudited) TRICO BANCSHARESCONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY(In thousands, except share and per share data; unaudited) See accompanying notes to unaudited condensed consolidated financial statements. NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS Note 1 - Summary of Significant Accounting Policies Description of Business and Basis of Presentation TriCo Bancshares (the “Company” or “we”) is a California corporation organized to act as a bank holding company for Tri Counties Bank(the “Bank”). The Company and the Bank are headquartered in Chico, California. The Bank is a California-chartered bank that isengaged in the general commercial banking business in 31 California counties. The consolidated financial statements are prepared inaccordance with accounting policies generally accepted in the United States