TCBK

tcbk-20260122falseTriCo Bancshares000035617100003561712026-01-222026-01-22

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

FORM 8-K

Current report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 22, 2026

(Exact name of registrant as specified in its charter)

California0-1066194-2792841 (State or other jurisdiction of incorporation or organization)(Commission File No.)(I.R.S. Employer Identification No.)

63 Constitution Drive Chico,California95973 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code: (530) 898-0300

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below): ☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act: Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, no par valueTCBKNasdaq

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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 complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02    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.

Item 7.01    Regulation FD Disclosure The executive officers of the Company intend to use the materials filed herewith, in whole or in part, in one or more presentations, discussions or meetings with investors. A copy of the investor presentation is attached hereto as Exhibit 99.2.

Item 8.01    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.

Item 9.01    Financial Statements and Exhibits (d) Exhibits 99.1    Press release dated January 22, 2026 99.2    Investor Presentation 104    Cover Page Interactive Data File (embedded within the Inline XBRL document).

The information furnished under Item 2.02, Item 7.01, Item 8.01 and Item 9.01 of this Current Period on Form 8-K, including the exhibit, shall not be deemed “filed” for purposes of Section 18 of the Securities and Exchange Act of 1934, as amended, or otherwise subject to the liabilities under that Section, nor shall it be deemed incorporated by reference in any registration statement or other filings of TriCo Bancshares under the Securities Act of 1933, as amended, except as shall be set forth by specific reference in such filing.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

TRICO BANCSHARES

Date: January 22, 2026 /s/ Peter G. Wiese Peter G. Wiese, Executive Vice President and Chief Financial Officer (Principal Financial and Accounting Officer)

tcbk-20251023falseTriCo Bancshares000035617100003561712025-10-232025-10-23

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

FORM 8-K

Current report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 23, 2025

(Exact name of registrant as specified in its charter)

California0-1066194-2792841 (State or other jurisdiction of incorporation or organization)(Commission File No.)(I.R.S. Employer Identification No.)

63 Constitution Drive Chico,California95973 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code: (530) 898-0300

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below): ☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act: Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, no par valueTCBKNasdaq

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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 complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02    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.

Item 7.01    Regulation FD Disclosure The executive officers of the Company intend to use the materials filed herewith, in whole or in part, in one or more presentations, discussions or meetings with investors. A copy of the investor presentation is attached hereto as Exhibit 99.2.

Item 9.01    Financial Statements and Exhibits (d) Exhibits 99.1    Press release dated October 23, 2025 99.2    Investor Presentation 104    Cover Page Interactive Data File (embedded within the Inline XBRL document).

The information furnished under Item 2.02, Item 7.01 and Item 9.01 of this Current Period on Form 8-K, including the exhibit, shall not be deemed “filed” for purposes of Section 18 of the Securities and Exchange Act of 1934, as amended, or otherwise subject to the liabilities under that Section, nor shall it be deemed incorporated by reference in any registration statement or other filings of TriCo Bancshares under the Securities Act of 1933, as amended, except as shall be set forth by specific reference in such filing.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

TRICO BANCSHARES

Date: October 23, 2025 /s/ Peter G. Wiese Peter G. Wiese, Executive Vice President and Chief Financial Officer (Principal Financial and Accounting Officer)

tcbk-20250724falseTriCo Bancshares000035617100003561712025-07-242025-07-24

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington D.C. 20549

FORM 8-K

Current report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 24, 2025

(Exact name of registrant as specified in its charter)

California0-1066194-2792841 (State or other jurisdiction of incorporation or organization)(Commission File No.)(I.R.S. Employer Identification No.)

63 Constitution Drive Chico,California95973 (Address of principal executive offices)(Zip Code)

Registrant’s telephone number, including area code: (530) 898-0300

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below): ☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act: Title of each classTrading Symbol(s)Name of each exchange on which registered Common Stock, no par valueTCBKNasdaq

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). 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 complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02    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.

Item 7.01    Regulation FD Disclosure The executive officers of the Company intend to use the materials filed herewith, in whole or in part, in one or more presentations, discussions or meetings with investors. A copy of the investor presentation is attached hereto as Exhibit 99.2.

Item 9.01    Financial Statements and Exhibits (d) Exhibits 99.1    Press release dated July 24, 2025 99.2    Investor Presentation 104    Cover Page Interactive Data File (embedded within the Inline XBRL document).

The information furnished under Item 2.02, Item 7.01 and Item 9.01 of this Current Period on Form 8-K, including the exhibit, shall not be deemed “filed” for purposes of Section 18 of the Securities and Exchange Act of 1934, as amended, or otherwise subject to the liabilities under that Section, nor shall it be deemed incorporated by reference in any registration statement or other filings of TriCo Bancshares under the Securities Act of 1933, as amended, except as shall be set forth by specific reference in such filing.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

TRICO BANCSHARES

Date: July 24, 2025 /s/ Peter G. Wiese Peter G. Wiese, Executive Vice President and Chief Financial Officer (Principal Financial and Accounting Officer)