Business Description

Overview TriCo Bancshares is a registered bank holding company under the Bank Holding Company Act of 1956, as amended (the “BHC Act”). TriCo's principal business is to serve as the holding company for our wholly-owned subsidiary, Tri Counties Bank, a California-chartered commercial bank (the “Bank”). TriCo is a California corporation and was incorporated in 1981. Our common stock is traded on the Nasdaq Global Select Market under the trading symbol "TCBK". The Company and the Bank are headquartered in Chico, California. As a bank holding company, TriCo is subject to the supervision of the Board of Governors of the Federal Reserve System (the “FRB”) under the BHC Act. The Bank is subject to the supervision of the California Department of Financial Protection & Innovation (the “DFPI”) and the Federal Deposit Insurance Corporation (the "FDIC"). See “Regulation and Supervision.” The Company maintains two capital subsidiary business trusts (collectively, the Trusts), both organized by the Company. For financial reporting purposes, the Company’s remaining investments in the Trusts of $1.2 million are accounted for under the equity method and, accordingly, are not consolidated and are included in other assets on the consolidated balance sheet. For more information regarding the trust preferred securities please refer to “Note 14 – Junior Subordinated Debt” to the consolidated financial statements within Part II, Item 8 of this report. Additional Information Our executive offices are located at 63 Constitution Drive, Chico, California 95973, and our telephone number is (530) 898-0300. Additional information concerning the Company can be found on our website at www.tcbk.com. Copies of our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to these reports are available free of charge through the investor relations page of our website, www.tcbk.com/about/investor-relations , as soon as reasonably practicable after the Company files these reports with the U.S. Securities and Exchange Commission (“SEC”). The information on our website is not part of this annual report. Tri Counties Bank The Bank was organized in 1975 and had total assets of approximately $9.8 billion at December 31, 2025. Based in Chico, California, the Bank offers an extensive and competitive breadth of consumer, small business and commercial banking services through its network of stand-alone and in-store branches in communities throughout California. In addition to its California community bank network, the Bank provides advanced online and mobile banking, a shared nationwide network of over 40,000 surcharge-free ATMs, and bankers available by phone 7 days per week. The Bank provides a breadth of personal, small business and commercial financial services including accepting demand, savings and time deposits and making small business, commercial, real estate, and consumer loans, as well as a range of treasury management services and other customary banking services including safe deposit boxes at some branches. Brokerage and wealth management services are provided at the Bank’s offices by Tri Counties Advisors through the Bank’s arrangement with Raymond James Financial Services, Inc., an independent financial services provider and broker-dealer. The Bank offers a variety of banking and financial services to both personal, small business and commercial customers. In many instances the owners or stakeholders of the business and commercial customers are also personal customers. The industries that we serve are diverse in both number and type and include, but are not limited to, manufacturing, real estate development, retail, wholesale, transportation, agriculture, commerce, oil & gas, and professional services. The majority of the Bank’s loans are direct loans made to individuals and businesses in California where its branches or business lending centers are located. At December 31, 2025, the Bank’s consumer loans net of deferred fees outstanding were $1.3 billion (18.5%), commercial and industrial loans outstanding were $464.4 million (6.5%), real estate construction loans of $301.0 million (4.2%), and commercial real estate loans were $4.9 billion (68.3%) of total loans. The Bank takes real estate, listed and unlisted securities, savings and time deposits, automobiles, machinery, equipment, inventory, accounts receivable and notes receivable secured by property as collateral for loans.…