COLB

colb-202601220000887343false00008873432026-01-222026-01-22

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 and Exchange Act of 1934

Date of Report: January 22, 2026
(Date of earliest event reported)

Columbia Banking System, Inc.
(Exact Name of Registrant as Specified in Its Charter)

Washington000-2028891-1422237
(State or Other Jurisdiction of Incorporation or Organization)
(Commission File Number)
(I.R.S. Employer Identification Number)

1301 A Street
Tacoma, Washington 98402-4200
(address of Principal Executive Offices)(Zip Code)

(253) 305-1900

(Registrant's Telephone Number, Including Area Code)

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:

[ ☐ ]    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 SYMBOLNAME OF EXCHANGE
Common Stock, No Par ValueCOLBThe Nasdaq Stock Market LLC

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 2.02Results of Operations and Financial Condition.

On January 22, 2026, Columbia Banking System, Inc. issued a press release announcing fourth quarter and full year 2025 financial results. The release is attached hereto as Exhibit 99.1. Columbia Banking System, Inc. will include final financial statements and additional analyses for the year ended December 31, 2025 as part of its annual report on Form 10-K covering that period. The information contained in this paragraph, as well as Exhibit 99.1 referenced herein, shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the “Securities Act”).

Item 7.01Regulation FD Disclosure.

On January 22, 2026, Columbia Banking System, Inc. issued an investor slide presentation that it intends to review in conjunction with its earnings release conference call on January 22, 2026. The slides attached hereto as Exhibit 99.2 to this report and shall not be deemed to be "filed" for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.
(d)EXHIBITS
99.1 Press Release announcing fourth quarter 2025 financial results dated January 22, 2026

99.2 Fourth Quarter 2025 Investor Presentation

104  Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 hereunto duly authorized.

Columbia Banking System, Inc.
(Registrant)

Dated: January 22, 2026
By: /s/ Ivan A. Seda
Ivan A. Seda
Executive Vice President, Chief Financial Officer

colb-202510300000887343false00008873432025-10-302025-10-30

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 and Exchange Act of 1934

Date of Report: October 30, 2025
(Date of earliest event reported)

Columbia Banking System, Inc.
(Exact Name of Registrant as Specified in Its Charter)

Washington000-2028891-1422237
(State or Other Jurisdiction of Incorporation or Organization)
(Commission File Number)
(I.R.S. Employer Identification Number)

1301 A Street
Tacoma, Washington 98402-4200
(address of Principal Executive Offices)(Zip Code)

(253) 305-1900

(Registrant's Telephone Number, Including Area Code)

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:

[ ☐ ]    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 SYMBOLNAME OF EXCHANGE
Common Stock, No Par ValueCOLBThe Nasdaq Stock Market LLC

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 2.02Results of Operations and Financial Condition.

On October 30, 2025, Columbia Banking System, Inc. issued a press release announcing third quarter 2025 financial results. The release is attached hereto as Exhibit 99.1. Columbia Banking System, Inc. will include final financial statements and additional analyses for the quarter ended September 30, 2025 as part of its quarterly report on Form 10-Q covering that period. The information contained in this paragraph, as well as Exhibit 99.1 referenced herein, shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the “Securities Act”).

Item 7.01Regulation FD Disclosure.

On October 30, 2025, Columbia Banking System, Inc. issued an investor slide presentation that it intends to review in conjunction with its earnings release conference call on October 30, 2025. The slides attached hereto as Exhibit 99.2 to this report and shall not be deemed to be "filed" for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.
(d)EXHIBITS
99.1 Press Release announcing third quarter 2025 financial results dated October 30, 2025

99.2 Third Quarter 2025 Investor Presentation

104  Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 hereunto duly authorized.

Columbia Banking System, Inc.
(Registrant)

Dated: October 30, 2025
By: /s/ Ronald L. Farnsworth
Ronald L. Farnsworth
Executive Vice President/Chief Financial Officer

colb-202507240000887343false00008873432025-07-242025-07-24

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 and Exchange Act of 1934

Date of Report: July 24, 2025
(Date of earliest event reported)

Columbia Banking System, Inc.
(Exact Name of Registrant as Specified in Its Charter)

Washington000-2028891-1422237
(State or Other Jurisdiction of Incorporation or Organization)
(Commission File Number)
(I.R.S. Employer Identification Number)

1301 A Street
Tacoma, Washington 98402-4200
(address of Principal Executive Offices)(Zip Code)

(253) 305-1900

(Registrant's Telephone Number, Including Area Code)

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:

[ ☐ ]    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 SYMBOLNAME OF EXCHANGE
Common Stock, No Par ValueCOLBThe NASDAQ Stock Market LLC

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 2.02Results of Operations and Financial Condition.

On July 24, 2025, Columbia Banking System, Inc. issued a press release announcing second quarter 2025 financial results. The release is attached hereto as Exhibit 99.1. The information included in the press release is considered to be "furnished" under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Columbia Banking System, Inc. will include final financial statements and additional analyses for the quarter ended June 30, 2025 as part of its quarterly report on Form 10-Q covering that period.

Item 7.01Regulation FD Disclosure.

Columbia Banking System, Inc. is filing an investor slide presentation that it intends to review in conjunction with its earnings release conference call on July 24, 2025. The slides are included as Exhibit 99.2 to this report and shall not be deemed to be "filed" for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.
(d)EXHIBITS
99.1 Press Release announcing second quarter 2025 financial results dated July 24, 2025

99.2 Second Quarter 2025 Investor Presentation

104  Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 hereunto duly authorized.

Columbia Banking System, Inc.
(Registrant)

Dated: July 24, 2025
By: /s/ Ronald L. Farnsworth
Ronald L. Farnsworth
Executive Vice President/Chief Financial Officer

colb-202504230000887343false00008873432025-04-232025-04-23

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 and Exchange Act of 1934

Date of Report: April 23, 2025
(Date of earliest event reported)

Columbia Banking System, Inc.
(Exact Name of Registrant as Specified in Its Charter)

Washington000-2028891-1422237
(State or Other Jurisdiction of Incorporation or Organization)
(Commission File Number)
(I.R.S. Employer Identification Number)

1301 A Street
Tacoma, Washington 98402-4200
(address of Principal Executive Offices)(Zip Code)

(253) 305-1900

(Registrant's Telephone Number, Including Area Code)

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:

[ ☒ ]    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 SYMBOLNAME OF EXCHANGE
Common Stock, No Par ValueCOLBThe NASDAQ Stock Market LLC

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 2.02Results of Operations and Financial Condition.

On April 23, 2025, Columbia Banking System, Inc. issued a press release announcing first quarter 2025 financial results. The release is attached hereto as Exhibit 99.1. The information included in the press release is considered to be "furnished" under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Columbia Banking System, Inc. will include final financial statements and additional analyses for the quarter ended March 31, 2025 as part of its quarterly report on Form 10-Q covering that period.

Item 7.01Regulation FD Disclosure.

Columbia Banking System, Inc. is filing an investor slide presentation that it intends to review in conjunction with its earnings release conference call on April 23, 2025. The slides are included as Exhibit 99.2 to this report and shall not be deemed to be "filed" for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.
(d)EXHIBITS
99.1 Press Release announcing first quarter 2025 financial results dated April 23, 2025

99.2 First Quarter 2025 Investor Presentation

104  Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 hereunto duly authorized.

Columbia Banking System, Inc.
(Registrant)

Dated: April 23, 2025
By: /s/ Ronald L. Farnsworth
Ronald L. Farnsworth
Executive Vice President/Chief Financial Officer

colb-202501230000887343false00008873432025-01-232025-01-23

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 and Exchange Act of 1934

Date of Report: January 23, 2025
(Date of earliest event reported)

Columbia Banking System, Inc.
(Exact Name of Registrant as Specified in Its Charter)

Washington000-2028891-1422237
(State or Other Jurisdiction of Incorporation or Organization)
(Commission File Number)
(I.R.S. Employer Identification Number)

1301 A Street
Tacoma, Washington 98402-2156
(address of Principal Executive Offices)(Zip Code)

(253) 305-1900

(Registrant's Telephone Number, Including Area Code)

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:

[ ☐ ]    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 SYMBOLNAME OF EXCHANGE
Common Stock, No Par ValueCOLBThe NASDAQ Stock Market LLC

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 2.02Results of Operations and Financial Condition.

On January 23, 2025, Columbia Banking System, Inc. issued a press release announcing fourth quarter and full year 2024 financial results. The release is attached hereto as Exhibit 99.1. The information included in the press release is considered to be "furnished" under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Columbia Banking System, Inc. will include final financial statements and additional analyses for the year ended December 31, 2024 as part of its annual report on Form 10-K covering that period.

Item 7.01Regulation FD Disclosure.

Columbia Banking System, Inc. is filing an investor slide presentation that it intends to review in conjunction with its earnings release conference call on January 23, 2025. The slides are included as Exhibit 99.2 to this report and shall not be deemed to be "filed" for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.
(d)EXHIBITS
99.1 Press Release announcing fourth quarter 2024 and full year financial results dated January 23, 2025

99.2 Fourth Quarter 2024 Investor Presentation

104  Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 hereunto duly authorized.

Columbia Banking System, Inc.
(Registrant)

Dated: January 23, 2025
By: /s/ Ronald L. Farnsworth
Ronald L. Farnsworth
Executive Vice President/Chief Financial Officer

colb-202410240000887343false00008873432024-10-242024-10-24

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 and Exchange Act of 1934

Date of Report: October 24, 2024
(Date of earliest event reported)

Columbia Banking System, Inc.
(Exact Name of Registrant as Specified in Its Charter)

Washington000-2028891-1422237
(State or Other Jurisdiction of Incorporation or Organization)
(Commission File Number)
(I.R.S. Employer Identification Number)

1301 A Street
Tacoma, Washington 98402-2156
(address of Principal Executive Offices)(Zip Code)

(253) 305-1900

(Registrant's Telephone Number, Including Area Code)

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:

[ ☐ ]    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 SYMBOLNAME OF EXCHANGE
Common Stock, No Par ValueCOLBThe NASDAQ Stock Market LLC

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 2.02Results of Operations and Financial Condition.

On October 24, 2024, Columbia Banking System, Inc. issued a press release announcing third quarter 2024 financial results. The release is attached hereto as Exhibit 99.1. The information included in the press release is considered to be "furnished" under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Columbia Banking System, Inc. will include final financial statements and additional analyses for the quarter ended September 30, 2024 as part of its quarterly report on Form 10-Q covering that period.

Item 7.01Regulation FD Disclosure.

Columbia Banking System, Inc. is filing an investor slide presentation that it intends to review in conjunction with its earnings release conference call on October 24, 2024. The slides are included as Exhibit 99.2 to this report and shall not be deemed to be "filed" for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.
(d)EXHIBITS
99.1 Press Release announcing third quarter 2024 financial results dated October 24, 2024

99.2 Third Quarter 2024 Investor Presentation

104  Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 hereunto duly authorized.

Columbia Banking System, Inc.
(Registrant)

Dated: October 24, 2024
By: /s/ Ronald L. Farnsworth
Ronald L. Farnsworth
Executive Vice President/Chief Financial Officer

colb-202407250000887343false00008873432024-07-252024-07-25

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 and Exchange Act of 1934

Date of Report: July 25, 2024
(Date of earliest event reported)

Columbia Banking System, Inc.
(Exact Name of Registrant as Specified in Its Charter)

Washington000-2028891-1422237
(State or Other Jurisdiction of Incorporation or Organization)
(Commission File Number)
(I.R.S. Employer Identification Number)

1301 A Street
Tacoma, Washington 98402-2156
(address of Principal Executive Offices)(Zip Code)

(253) 305-1900

(Registrant's Telephone Number, Including Area Code)

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:

[ ☐ ]    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 SYMBOLNAME OF EXCHANGE
Common Stock, No Par ValueCOLBThe NASDAQ Stock Market LLC

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 2.02Results of Operations and Financial Condition.

On July 25, 2024, Columbia Banking System, Inc. issued a press release announcing second quarter 2024 financial results. The release is attached hereto as Exhibit 99.1. The information included in the press release is considered to be "furnished" under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Columbia Banking System, Inc. will include final financial statements and additional analyses for the quarter ended June 30, 2024 as part of its quarterly report on Form 10-Q covering that period.

Item 7.01Regulation FD Disclosure.

Columbia Banking System, Inc. is filing an investor slide presentation that it intends to review in conjunction with its earnings release conference call on July 25, 2024. The slides are included as Exhibit 99.2 to this report and shall not be deemed to be "filed" for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.
(d)EXHIBITS
99.1 Press Release announcing second quarter 2024 financial results dated July 25, 2024

99.2 Second Quarter 2024 Investor Presentation

104  Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 hereunto duly authorized.

Columbia Banking System, Inc.
(Registrant)

Dated: July 25, 2024
By: /s/ Ronald L. Farnsworth
Ronald L. Farnsworth
Executive Vice President/Chief Financial Officer

colb-202404250000887343false00008873432024-04-252024-04-25

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 and Exchange Act of 1934

Date of Report: April 25, 2024
(Date of earliest event reported)

Columbia Banking System, Inc.
(Exact Name of Registrant as Specified in Its Charter)

Washington000-2028891-1422237
(State or Other Jurisdiction of Incorporation or Organization)
(Commission File Number)
(I.R.S. Employer Identification Number)

1301 A Street
Tacoma, Washington 98402-2156
(address of Principal Executive Offices)(Zip Code)

(253) 305-1900

(Registrant's Telephone Number, Including Area Code)

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:

[ ☐ ]    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 SYMBOLNAME OF EXCHANGE
Common Stock, No Par ValueCOLBThe NASDAQ Stock Market LLC

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 2.02Results of Operations and Financial Condition.

On April 25, 2024, Columbia Banking System, Inc. issued a press release announcing first quarter 2024 financial results. The release is attached hereto as Exhibit 99.1. The information included in the press release is considered to be "furnished" under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Columbia Banking System, Inc. will include final financial statements and additional analyses for the quarter ended March 31, 2024 as part of its quarterly report on Form 10-Q covering that period.

Item 7.01Regulation FD Disclosure.

Columbia Banking System, Inc. is filing an investor slide presentation that it intends to review in conjunction with its earnings release conference call on April 25, 2024. The slides are included as Exhibit 99.2 to this report and shall not be deemed to be "filed" for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.
(d)EXHIBITS
99.1 Press Release announcing first quarter 2024 financial results dated April 25, 2024

99.2 First Quarter 2024 Investor Presentation

104  Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 hereunto duly authorized.

Columbia Banking System, Inc.
(Registrant)

Dated: April 25, 2024
By: /s/ Ronald L. Farnsworth
Ronald L. Farnsworth
Executive Vice President/Chief Financial Officer

colb-202401240000887343false00008873432024-01-242024-01-24

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 and Exchange Act of 1934

Date of Report: January 24, 2024
(Date of earliest event reported)

Columbia Banking System, Inc.
(Exact Name of Registrant as Specified in Its Charter)

Washington000-2028891-1422237
(State or Other Jurisdiction of Incorporation or Organization)
(Commission File Number)
(I.R.S. Employer Identification Number)

1301 A Street
Tacoma, Washington 98402-2156
(address of Principal Executive Offices)(Zip Code)

(253) 305-1900

(Registrant's Telephone Number, Including Area Code)

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:

[ ☐ ]    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 SYMBOLNAME OF EXCHANGE
Common Stock, No Par ValueCOLBThe NASDAQ Stock Market LLC

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 2.02Results of Operations and Financial Condition.

On January 24, 2024, Columbia Banking System, Inc. issued a press release announcing fourth quarter and full year 2023 financial results. The release is attached hereto as Exhibit 99.1. The information included in the press release is considered to be "furnished" under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Columbia Banking System, Inc. will include final financial statements and additional analyses for the year ended December 31, 2023 as part of its annual report on Form 10-K covering that period.

Item 7.01Regulation FD Disclosure.

Columbia Banking System, Inc. is filing an investor slide presentation that it intends to review in conjunction with its earnings release conference call on January 24, 2024. The slides are included as Exhibit 99.2 to this report and shall not be deemed to be "filed" for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.
(d)EXHIBITS
99.1 Press Release announcing fourth quarter and full year 2023 financial results dated January 24, 2024

99.2 Fourth Quarter 2023 Investor Presentation

104  Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 hereunto duly authorized.

Columbia Banking System, Inc.
(Registrant)

Dated: January 24, 2024
By: /s/ Ronald L. Farnsworth
Ronald L. Farnsworth
Executive Vice President/Chief Financial Officer

colb-202310180000887343false00008873432023-10-182023-10-18

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 and Exchange Act of 1934

Date of Report: October 18, 2023
(Date of earliest event reported)

Columbia Banking System, Inc.
(Exact Name of Registrant as Specified in Its Charter)

Washington000-2028891-1422237
(State or Other Jurisdiction of Incorporation or Organization)
(Commission File Number)
(I.R.S. Employer Identification Number)

1301 A Street
Tacoma, Washington 98402-2156
(address of Principal Executive Offices)(Zip Code)

(253) 305-1900

(Registrant's Telephone Number, Including Area Code)

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:

[ ☐ ]    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 SYMBOLNAME OF EXCHANGE
Common Stock, No Par ValueCOLBThe NASDAQ Stock Market LLC

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 2.02Results of Operations and Financial Condition.

On October 18, 2023, Columbia Banking System, Inc. issued a press release announcing third quarter 2023 financial results. The release is attached hereto as Exhibit 99.1. The information included in the press release is considered to be "furnished" under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Columbia Banking System, Inc. will include final financial statements and additional analyses for the quarter ended September 30, 2023 as part of its quarterly report on Form 10-Q covering that period.

Item 7.01Regulation FD Disclosure.

Columbia Banking System, Inc. is filing an investor slide presentation that it intends to review in conjunction with its earnings release conference call on October 18, 2023. The slides are included as Exhibit 99.2 to this report and shall not be deemed to be "filed" for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.
(d)EXHIBITS
99.1 Press Release announcing third quarter 2023 financial results dated October 18, 2023

99.2 Third Quarter 2023 Investor Presentation

104  Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 hereunto duly authorized.

Columbia Banking System, Inc.
(Registrant)

Dated: October 18, 2023
By: /s/ Ronald L. Farnsworth
Ronald L. Farnsworth
Executive Vice President/Chief Financial Officer

colb-202307190000887343false00008873432023-07-192023-07-19

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 and Exchange Act of 1934

Date of Report: July 19, 2023
(Date of earliest event reported)

Columbia Banking System, Inc.
(Exact Name of Registrant as Specified in Its Charter)

Washington000-2028891-1422237
(State or Other Jurisdiction of Incorporation or Organization)
(Commission File Number)
(I.R.S. Employer Identification Number)

1301 A Street
Tacoma, Washington 98402-2156
(address of Principal Executive Offices)(Zip Code)

(253) 305-1900

(Registrant's Telephone Number, Including Area Code)

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:

[ ☐ ]    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 SYMBOLNAME OF EXCHANGE
Common Stock, No Par ValueCOLBThe NASDAQ Stock Market LLC

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 2.02Results of Operations and Financial Condition.

On July 19, 2023, Columbia Banking System, Inc. issued a press release announcing second quarter 2023 financial results. The release is attached hereto as Exhibit 99.1. The information included in the press release is considered to be "furnished" under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Columbia Banking System, Inc. will include final financial statements and additional analyses for the quarter ended June 30, 2023 as part of its quarterly report on Form 10-Q covering that period.

Item 7.01Regulation FD Disclosure.

Columbia Banking System, Inc. is filing an investor slide presentation that it intends to review in conjunction with its earnings release conference call on July 19, 2023. The slides are included as Exhibit 99.2 to this report and shall not be deemed to be "filed" for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.
(d)EXHIBITS
99.1 Press Release announcing second quarter 2023 financial results dated July 19, 2023

99.2 Second Quarter 2023 Investor Presentation

104  Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 hereunto duly authorized.

Columbia Banking System, Inc.
(Registrant)

Dated: July 19, 2023By: /s/ Ronald L. Farnsworth
Ronald L. Farnsworth
Executive Vice President/Chief Financial Officer

colb-202304260000887343false00008873432023-04-262023-04-26

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 and Exchange Act of 1934

Date of Report: April 26, 2023
(Date of earliest event reported)

Columbia Banking System, Inc.
(Exact Name of Registrant as Specified in Its Charter)

Washington000-2028891-1422237
(State or Other Jurisdiction of Incorporation or Organization)
(Commission File Number)
(I.R.S. Employer Identification Number)

1301 A Street
Tacoma, Washington 98402-2156
(address of Principal Executive Offices)(Zip Code)

(253) 305-1900

(Registrant's Telephone Number, Including Area Code)

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:

[ ☐ ]    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 SYMBOLNAME OF EXCHANGE
Common Stock, No Par ValueCOLBThe NASDAQ Stock Market LLC

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 2.02Results of Operations and Financial Condition.

On April 26, 2023, Columbia Banking System, Inc. issued a press release announcing first quarter 2023 financial results. The release is attached hereto as Exhibit 99.1. The information included in the press release is considered to be "furnished" under the Securities Exchange Act of 1934, as amended (the "Exchange Act"). Columbia Banking System, Inc. will include final financial statements and additional analyses for the quarter ended March 31, 2023 as part of its quarterly report on Form 10-Q covering that period.

Item 7.01Regulation FD Disclosure.

Columbia Banking System, Inc. is filing an investor slide presentation that it intends to review in conjunction with its earnings release conference call on April 26, 2023. The slides are included as Exhibit 99.2 to this report and shall not be deemed to be "filed" for the purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

Item 9.01Financial Statements and Exhibits.
(d)EXHIBITS
99.1 Press Release announcing first quarter 2023 financial results dated April 26, 2023

99.2 First Quarter 2023 Investor Presentation

104  Cover Page Interactive Data File (embedded within the Inline XBRL document)

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 hereunto duly authorized.

Columbia Banking System, Inc.
(Registrant)

Dated: April 26, 2023By: /s/ Clint E. Stein
Clint E. Stein
President and Chief Executive Officer

colb-202301240000887343false00008873432023-01-242023-01-24

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):
January 24, 2023

COLUMBIA BANKING SYSTEM, INC.
(Exact name of registrant as specified in its charter)
Washington000-2028891-1422237
(State or other jurisdiction
of incorporation)(Commission
File Number)(IRS Employer
Identification No.)

1301 A Street
Tacoma, WA 98402-2156
(Address of principal executive offices and zip code)
(253) 305-1900
(Registrant’s telephone number, including area code)

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:
☐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 symbolName of each exchange on which registered
Common Stock, No Par ValueCOLBThe Nasdaq Stock Market LLC

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. ☐

Items to be Included in this Report

Item 2.02 Results of Operations and Financial Condition
On January 24, 2023, Columbia Banking System, Inc. (the "Company") issued a press release reporting its financial results for the quarter and full year ended December 31, 2022 and reporting a quarterly cash dividend of $0.30 per share. The dividend will be paid on February 21, 2023 to shareholders of record as of the close of business on February 6, 2023. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference in its entirety.
Item 8.01 Other Events
The information concerning the Company's quarterly dividend included in Item 2.02 is incorporated by reference into this Item 8.01.
Item 9.01 Financial Statements and Exhibits
(d)
99.1 Press release dated January 24, 2023 reporting the financial results of Columbia Banking System, Inc. for the quarter and year ended December 31, 2022 and a quarterly cash dividend for the quarter ended December 31, 2022.

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 hereunto duly authorized.
COLUMBIA BANKING SYSTEM, INC.

Date:January 24, 2023/s/    CLINT E. STEIN
Clint E. Stein
President and
Chief Executive Officer

colb-202210200000887343false00008873432022-10-202022-10-20

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 20, 2022

COLUMBIA BANKING SYSTEM, INC.
(Exact name of registrant as specified in its charter)
Washington000-2028891-1422237
(State or other jurisdiction
of incorporation)(Commission
File Number)(IRS Employer
Identification No.)

1301 A Street
Tacoma, WA 98402-2156
(Address of principal executive offices and zip code)
(253) 305-1900
(Registrant’s telephone number, including area code)

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:
☐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 symbolName of each exchange on which registered
Common Stock, No Par ValueCOLBThe Nasdaq Stock Market LLC

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. ☐

Items to be Included in this Report

Item 2.02 Results of Operations and Financial Condition
On October 20, 2022, Columbia Banking System, Inc. (the "Company") issued a press release reporting its financial results for the quarter ended September 30, 2022. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference in its entirety.
Item 9.01 Financial Statements and Exhibits
(d)
99.1 Press release dated October 20, 2022 reporting the financial results of Columbia Banking System, Inc. for the quarter ended September 30, 2022.

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 hereunto duly authorized.
COLUMBIA BANKING SYSTEM, INC.

Date:October 20, 2022/s/    CLINT E. STEIN
Clint E. Stein
President and
Chief Executive Officer

colb-202207210000887343false00008873432022-07-212022-07-21

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 21, 2022

COLUMBIA BANKING SYSTEM, INC.
(Exact name of registrant as specified in its charter)
Washington000-2028891-1422237
(State or other jurisdiction
of incorporation)(Commission
File Number)(IRS Employer
Identification No.)

1301 A Street
Tacoma, WA 98402-2156
(Address of principal executive offices and zip code)
(253) 305-1900
(Registrant’s telephone number, including area code)

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:
☐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 symbolName of each exchange on which registered
Common Stock, No Par ValueCOLBThe Nasdaq Stock Market LLC

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. ☐

Items to be Included in this Report

Item 2.02 Results of Operations and Financial Condition
On July 21, 2022, Columbia Banking System, Inc. (the "Company") issued a press release reporting its financial results for the quarter ended June 30, 2022 and reporting a quarterly cash dividend of $0.30 per share. The dividend will be paid on August 17, 2022 to shareholders of record at the close of business on August 3, 2022. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference in its entirety.
Item 8.01 Other Events
The information concerning the Company's quarterly dividend included in Item 2.02 is incorporated by reference into this Item 8.01.
Item 9.01 Financial Statements and Exhibits
(d)
99.1 Press release dated July 21, 2022 reporting the financial results of Columbia Banking System, Inc. for the quarter ended June 30, 2022 and a quarterly cash dividend for the quarter ended June 30, 2022.

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 hereunto duly authorized.
COLUMBIA BANKING SYSTEM, INC.

Date:July 21, 2022/s/    CLINT E. STEIN
Clint E. Stein
President and
Chief Executive Officer

colb-202204210000887343false00008873432022-04-212022-04-21

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):
April 21, 2022

COLUMBIA BANKING SYSTEM, INC.
(Exact name of registrant as specified in its charter)
Washington000-2028891-1422237
(State or other jurisdiction
of incorporation)(Commission
File Number)(IRS Employer
Identification No.)

1301 A Street
Tacoma, WA 98402-2156
(Address of principal executive offices and zip code)
(253) 305-1900
(Registrant’s telephone number, including area code)

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:
☐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 symbolName of each exchange on which registered
Common Stock, No Par ValueCOLBThe Nasdaq Stock Market LLC

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. ☐

Items to be Included in this Report

Item 2.02 Results of Operations and Financial Condition
On April 21, 2022, Columbia Banking System, Inc. (the "Company") issued a press release reporting its financial results for the quarter ended March 31, 2022 and reporting a quarterly cash dividend of $0.30 per share. The dividend will be paid on May 18, 2022 to shareholders of record at the close of business on May 4, 2022. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference in its entirety.
Item 8.01 Other Events
The information concerning the Company's quarterly dividend included in Item 2.02 is incorporated by reference into this Item 8.01.
Item 9.01 Financial Statements and Exhibits
(d)
99.1 Press release dated April 21, 2022 reporting the financial results of Columbia Banking System, Inc. for the quarter ended March 31, 2022 and a quarterly cash dividend for the quarter ended March 31, 2022.

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 hereunto duly authorized.
COLUMBIA BANKING SYSTEM, INC.

Date:April 21, 2022/s/    CLINT E. STEIN
Clint E. Stein
President and
Chief Executive Officer

colb-202201190000887343false00008873432022-01-192022-01-19

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 19, 2022

COLUMBIA BANKING SYSTEM, INC.
(Exact name of registrant as specified in its charter)
Washington000-2028891-1422237
(State or other jurisdiction
of incorporation)(Commission
File Number)(IRS Employer
Identification No.)

1301 A Street
Tacoma, WA 98402-2156
(Address of principal executive offices and zip code)
(253) 305-1900
(Registrant’s telephone number, including area code)

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:
☒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 symbolName of each exchange on which registered
Common Stock, No Par ValueCOLBThe Nasdaq Stock Market LLC

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. ☐

Items to be Included in this Report

Item 2.02 Results of Operations and Financial Condition
On January 19, 2022, Columbia Banking System, Inc. (the "Company") issued a press release reporting its financial results for the quarter ended December 31, 2021 and reporting a quarterly cash dividend of $0.30 per share. The dividend will be paid on  February 16, 2022 to shareholders of record at the close of business on February 2, 2022. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference in its entirety.
Item 8.01 Other Events
The information concerning the Company's quarterly dividend included in Item 2.02 is incorporated by reference into this Item 8.01.
Item 9.01 Financial Statements and Exhibits
(d)
99.1 Press release dated January 19, 2022 reporting the financial results of Columbia Banking System, Inc. for the quarter and full year ended December 31, 2021 and a quarterly cash dividend for the quarter ended December 31, 2021.

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 hereunto duly authorized.
COLUMBIA BANKING SYSTEM, INC.

Date:January 20, 2022/s/    CLINT E. STEIN
Clint E. Stein
President and
Chief Executive Officer

colb-202110280000887343false00008873432021-10-282021-10-28

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 28, 2021

COLUMBIA BANKING SYSTEM, INC.
(Exact name of registrant as specified in its charter)
Washington000-2028891-1422237
(State or other jurisdiction
of incorporation)(Commission
File Number)(IRS Employer
Identification No.)

1301 A Street
Tacoma, WA 98402-2156
(Address of principal executive offices and zip code)
(253) 305-1900
(Registrant’s telephone number, including area code)

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:
☒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 symbolName of each exchange on which registered
Common Stock, No Par ValueCOLBThe Nasdaq Stock Market LLC

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. ☐

Items to be Included in this Report

Item 2.02 Results of Operations and Financial Condition
On October 28, 2021, Columbia Banking System, Inc. (the "Company") issued a press release reporting its financial results for the quarter ended September 30, 2021. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference in its entirety.
Item 9.01 Financial Statements and Exhibits
(d)
99.1 Press release dated October 28, 2021 reporting the financial results of Columbia Banking System, Inc. for the quarter ended September 30, 2021.

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 hereunto duly authorized.
COLUMBIA BANKING SYSTEM, INC.

Date:October 28, 2021/s/    CLINT E. STEIN
Clint E. Stein
President and
Chief Executive Officer

colb-202107290000887343false00008873432021-07-292021-07-29

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 29, 2021

COLUMBIA BANKING SYSTEM, INC.
(Exact name of registrant as specified in its charter)
Washington000-2028891-1422237
(State or other jurisdiction
of incorporation)(Commission
File Number)(IRS Employer
Identification No.)

1301 A Street
Tacoma, WA 98402-2156
(Address of principal executive offices and zip code)
(253) 305-1900
(Registrant’s telephone number, including area code)

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:
☒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 symbolName of each exchange on which registered
Common Stock, No Par ValueCOLBThe Nasdaq Stock Market LLC

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. ☐

Items to be Included in this Report

Item 2.02 Results of Operations and Financial Condition
On July 29, 2021, Columbia Banking System, Inc. (the "Company") issued a press release reporting its financial results for the quarter ended June 30, 2021 and reporting a quarterly cash dividend of $0.28 per share. The dividend will be paid on August 25, 2021 to shareholders of record at the close of business on August 11, 2021. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference in its entirety.
Item 8.01 Other Events
The information concerning the Company's quarterly dividend included in Item 2.02 is incorporated by reference into this Item 8.01.
Item 9.01 Financial Statements and Exhibits
(d)
99.1 Press release dated July 29, 2021 reporting the financial results of Columbia Banking System, Inc. for the quarter ended June 30, 2021 and a quarterly cash dividend for the quarter ended June 30, 2021.

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 hereunto duly authorized.
COLUMBIA BANKING SYSTEM, INC.

Date:July 29, 2021/s/    CLINT E. STEIN
Clint E. Stein
President and
Chief Executive Officer

colb-202104290000887343false00008873432021-04-292021-04-29

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):
April 29, 2021

COLUMBIA BANKING SYSTEM, INC.
(Exact name of registrant as specified in its charter)

Washington000-2028891-1422237
(State or other jurisdiction
of incorporation)(Commission
File Number)(IRS Employer
Identification No.)

1301 A Street
Tacoma, WA 98402-2156
(Address of principal executive offices and zip code)
(253) 305-1900
(Registrant’s telephone number, including area code)

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:

☐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 symbolName of each exchange on which registered
Common Stock, No Par ValueCOLBThe Nasdaq Stock Market LLC

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. ☐

Items to be Included in this Report

Item 2.02 Results of Operations and Financial Condition
On April 29, 2021, Columbia Banking System, Inc. (the "Company") issued a press release reporting its financial results for the quarter ended March 31, 2021 and reporting a quarterly cash dividend of $0.28 per share. The dividend will be paid on May 26, 2021 to shareholders of record at the close of business on May 12, 2021. A copy of the press release is attached hereto as Exhibit 99.1 and is incorporated herein by reference in its entirety.
Item 8.01 Other Events
The information concerning the Company's quarterly dividend included in Item 2.02 is incorporated by reference into this Item 8.01.
Item 9.01 Financial Statements and Exhibits
(d)
99.1 Press release dated April 29, 2021 reporting the financial results of Columbia Banking System, Inc. for the quarter ended March 31, 2021 and a quarterly cash dividend for the quarter ended March 31, 2021.

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 hereunto duly authorized.

COLUMBIA BANKING SYSTEM, INC.

Date:April 29, 2021/s/    CLINT E. STEIN
Clint E. Stein
President and
Chief Executive Officer