Other Events The Board of Directors of TriCo Bancshares (NASDAQ: TCBK), parent company of Tri Counties Bank, declared a quarterly cash dividend of $0.36 (thirty-six cents) per share on its common stock, no par value, on August 20, 2026. The dividend is payable on September 25, 2026 to holders of record on September 11, 2026.

Results of Operations and Financial Condition On July 23, 2026, TriCo Bancshares (the "Company") announced its unaudited financial results as of and for the three and six months ended June 30, 2026. A copy of the press release is attached as Exhibit 99.1 to this to this Form 8-K and is incorporated herein by reference.

Richard P. Smith: Grant of a special one-time transaction bonus in connection with the approval of the Merger Agreement.

Entry into a Material Definitive Agreement Merger Agreement Overview On July 12, 2026, TriCo Bancshares, a California corporation (“TriCo”), entered into an Agreement and Plan of Reorganization and Merger (the “Merger Agreement”) with First Hawaiian, Inc., a Delaware corporation (“FHI”), and Horizon Merger Sub, Inc., a California corporation and a direct, wholly owned subsidiary of FHI (“Merger Sub”). The Merger Agreement provides that, upon the terms and subject to the conditions set forth t…

Other Events The Board of Directors of TriCo Bancshares (NASDAQ: TCBK), parent company of Tri Counties Bank, declared a quarterly cash dividend of $0.36 (thirty-six cents) per share on its common stock, no par value, on May 21, 2026. The dividend is payable on June 26, 2026 to holders of record on June 5, 2026.

Results of Operations and Financial Condition On April 23, 2026, TriCo Bancshares (the "Company") announced its unaudited financial results as of and for the three months ended March 31, 2026. A copy of the press release is attached as Exhibit 99.1 to this to this Form 8-K and is incorporated herein by reference.

Other Events The Board of Directors of TriCo Bancshares (NASDAQ: TCBK), parent company of Tri Counties Bank, declared a quarterly cash dividend of $0.36 (thirty-six cents) per share on its common stock, no par value, on February 19, 2026. The dividend is payable on March 20, 2026 to holders of record on March 6, 2026.

Other Events On January 22, 2026, the Company announced that it had adopted a share repurchase program. A copy of the press release is attached as Exhibit 99.1 to this to this Form 8-K and is incorporated herein by reference.

Results of Operations and Financial Condition On January 22, 2026, TriCo Bancshares (the "Company") announced its unaudited financial results as of and for the twelve months ended months ended December 31, 2025. In addition, the Company announced a new share repurchase program authorizing the repurchase of up to 2,000,000 shares of common stock. A copy of the press release is attached as Exhibit 99.1 to this to this Form 8-K and is incorporated herein by reference.

Executive Vice President & Chief Operating Officer — John S. Fleshood: Mr. Fleshood retired from his position at TriCo Bancshares.

Other Events The Board of Directors of TriCo Bancshares (NASDAQ: TCBK), parent company of Tri Counties Bank, declared a quarterly cash dividend of $0.36 (thirty-six cents) per share on its common stock, no par value, on November 20, 2025. The dividend is payable on December 19, 2025 to holders of record on December 5, 2025.

Results of Operations and Financial Condition On October 23, 2025, TriCo Bancshares (the "Company") announced its unaudited financial results as of and for the three and nine months ended September 30, 2025. A copy of the press release is attached as Exhibit 99.1 to this to this Form 8-K and is incorporated herein by reference.

Other Events The Board of Directors of TriCo Bancshares (NASDAQ: TCBK), parent company of Tri Counties Bank, declared a quarterly cash dividend of $0.36 (thirty-six cents) per share on its common stock, no par value, on August 21, 2025. The dividend is payable on September 19, 2025 to holders of record on September 5, 2025.

Results of Operations and Financial Condition On July 24, 2025, TriCo Bancshares (the "Company") announced its unaudited financial results as of and for the three and six months ended June 30, 2025. A copy of the press release is attached as Exhibit 99.1 to this to this Form 8-K and is incorporated herein by reference.

Changes in Registrant’s Certifying Accountant On June 3, 2025, TriCo Bancshares, (the "Company") was notified that Moss Adams LLP ("Moss Adams"), the Company's independent registered public accounting firm, merged with Baker Tilly US, LLP effective on June 3, 2025. The combined audit practices operate as Baker Tilly US, LLP (“Baker Tilly”). In connection with the notification of the merger, Moss Adams has resigned as the auditors of the Company and the Audit Committee of the Company’s Board o…

Other Events The Board of Directors of TriCo Bancshares (NASDAQ: TCBK), parent company of Tri Counties Bank, declared a quarterly cash dividend of $0.33 (thirty-three cents) per share on its common stock, no par value, on May 22, 2025. The dividend is payable on June 20, 2025 to holders of record on June 6, 2025.

Results of Operations and Financial Condition On April 24, 2025, TriCo Bancshares (the "Company") announced its unaudited financial results as of and for the three months ended March 31, 2025. A copy of the press release is attached as Exhibit 99.1 to this to this Form 8-K and is incorporated herein by reference.

Executive Vice President & Chief Operating Officer — John S. Fleshood: John S. Fleshood is retiring from his position as Executive Vice President & Chief Operating Officer in December 2025.

Other Events The Board of Directors of TriCo Bancshares (NASDAQ: TCBK), parent company of Tri Counties Bank, declared a quarterly cash dividend of $0.33 (thirty-three cents) per share on its common stock, no par value, on February 20, 2025. The dividend is payable on March 21, 2025 to holders of record on March 7, 2025.

Results of Operations and Financial Condition On January 23, 2025, TriCo Bancshares (the "Company") announced its unaudited financial results as of and for the twelve months ended months ended December 31, 2024. A copy of the press release is attached as Exhibit 99.1 to this to this Form 8-K and is incorporated herein by reference.

Other Events The Board of Directors of TriCo Bancshares (NASDAQ: TCBK), parent company of Tri Counties Bank, declared a quarterly cash dividend of $0.33 (thirty-three cents) per share on its common stock, no par value, on November 21, 2024. The dividend is payable on December 20, 2024 to holders of record on December 6, 2024.

Results of Operations and Financial Condition On October 24, 2024, TriCo Bancshares (the "Company") announced its unaudited financial results as of and for the three and nine months ended September 30, 2024. A copy of the press release is attached as Exhibit 99.1 to this to this Form 8-K and is incorporated herein by reference.

Other Events The Board of Directors of TriCo Bancshares (NASDAQ: TCBK), parent company of Tri Counties Bank, declared a quarterly cash dividend of $0.33 (thirty-three cents) per share on its common stock, no par value, on August 22, 2024. The dividend is payable on September 20, 2024 to holders of record on September 6, 2024.

Results of Operations and Financial Condition On July 25, 2024, TriCo Bancshares (the "Company") announced its unaudited financial results as of and for the three and six month periods ended June 30, 2024. A copy of the press release is attached as Exhibit 99.1 to this to this Form 8-K and is incorporated herein by reference.

Other Events The Board of Directors of TriCo Bancshares (NASDAQ: TCBK), parent company of Tri Counties Bank, declared a quarterly cash dividend of $0.33 (thirty-three cents) per share on its common stock, no par value, on May 23, 2024. The dividend is payable on June 21, 2024 to holders of record on June 7, 2024.