COLUMBIA BANKING SYSTEM, INC.
For the period ended Dec 31, 2025. Filed Feb 26, 2026.
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FY2025 · Filed Feb 26, 2026
COLB$30.85-0.5%Stored close · as of Nov 10, 2026
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EXHIBIT INDEX
| Exhibit# | Description | Location |
| 2.1 | Agreement and Plan of Merger, dated as of April 23, 2025, by and among the Company, Pacific Premier, and Balboa Merger Sub, Inc. | Incorporated by reference to Exhibit 2.1 of the Company's Current Report on Form 8-K filed on April 25, 2025 |
| 3.1 | Restated Articles of Incorporation | Incorporated by reference to Exhibit 3.1 of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 |
| 3.2 | Amended and Restated Bylaws of Columbia Banking System, Inc. | Filed herewith |
| 4.1 | Specimen Common Stock Certificate | Incorporated by reference to Exhibit 4.3 of the Company’s Registration Statement on Form S-3 filed on December 19, 2008 |
| 4.2 | Pursuant to Item 601(b) (4) (iii) (A) of Regulation S-K, copies of instruments defining the rights of holders of long-term debt and preferred securities are not filed. The Company agrees to furnish a copy thereof to the Securities and Exchange Commission upon request. | |
| 4.3 | Description of Capital Stock (securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934) | Incorporated by reference to Exhibit 4.3 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2019 |
| 10.1** | 2018 Equity Incentive Plan (as amended through May 22, 2019) | Incorporated by reference to Exhibit 10.1 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 |
| 10.2** | Form of Restricted Stock Agreement | Incorporated by reference to Exhibit 10.2 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 |
| 10.3** | Form of Restricted Stock Unit Agreement | Incorporated by reference to Exhibit 10.3 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 |
| 10.4** | Form of Performance Stock Unit Agreement | Incorporated by reference to Exhibit 10.4 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 |
| 10.5** | Change in Control Agreement between the Bank and Lisa Dow dated as of November 25, 2020 | Incorporated by reference to Exhibit 10.22 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 |
| 10.6** | Supplemental Compensation Agreement between the Bank and Clint E. Stein | Incorporated by reference to Exhibit 10.16 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2007 |
| 10.7** | Form of Indemnification Agreement between the Company and its directors | Incorporated by reference to Exhibit 10.4 of the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2009 |
| 10.8** | Amended and Restated Columbia Banking System, Inc. 2005 401 Plus Plan (Deferred Compensation Plan), dated October 26, 2016 for directors and key employees | Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed October 28, 2016 |
| Exhibit# | Description | Location |
|---|---|---|
| 10.9** | Amendment to Amended and Restated Columbia Banking System, Inc. 2005 401 Plus Plan (Deferred Compensation plan), dated November 14, 2022 | Incorporated by reference to Exhibit 10.18 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 |
| 10.10** | Columbia Banking System, Inc. 2016 401 Plus Plan (Deferred Compensation Plan), dated October 26, 2016 for directors and key employees | Incorporated by reference to Exhibit 10.2 of the Company’s Current Report on Form 8-K filed October 28, 2016 |
| 10.11** | Amendment to Columbia Banking System, Inc. 2016 401 Plus Plan (deferred Compensation Plan), dated November 14, 2022 | Incorporated by reference to Exhibit 10.20 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 |
| 10.12** | Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Kumi Baruffi, effective February 27, 2015 | Incorporated by reference to Exhibit 10.8 of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2015 |
| 10.13** | First Amendment to the Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Kumi Baruffi, effective November 15, 2017 | Incorporated by reference to Exhibit 10.47 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 |
| 10.14** | First Amended and Restated Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Clint E. Stein, effective February 24, 2015 | Incorporated by reference to Exhibit 10.3 of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2015 |
| 10.15** | First Amendment to the First Amended and Restated Columbia State Bank Supplemental Executive Retirement Plan Agreement, by and between the Bank and Clinton E. Stein, effective November 15, 2017 | Incorporated by reference to Exhibit 10.51 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2017 |
| 10.16** | Employment Offer (Lisa Dow), dated January 3, 2018 | Incorporated by reference to Exhibit 10.4 of the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2018 |
| 10.17** | Amended and Restated Employment Agreement, dated as of October 11, 2021, by and between Columbia Banking System, Inc. and Clint E. Stein | Incorporated by reference to Exhibit 10.32 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 |
| 10.18** | First Amendment to the Employment Agreement and the A&R Employment Agreement, dated as of December 31, 2022, by and between Columbia Banking System, Inc. and Clint E. Stein | Incorporated by reference to Exhibit 10.33 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 |
| 10.19** | Amended and Restated Employee Stock Purchase Plan | Incorporated by reference to Exhibit 10.7 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2010 |
| 10.20** | First Amendment to Amended and Restated Employee Stock Purchase Plan | Incorporated by reference to Exhibit 10.4 of the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2018 |
| 10.21** | Second Amendment to the Columbia State Bank Endorsement Method Split Dollar Agreement, by and between the Bank and Kumi Baruffi, effective May 31, 2019 | Incorporated by reference to Exhibit 10.3 of the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2019 |
| 10.22** | Third Amendment to the Columbia State Bank Endorsement Method Split Dollar Agreement, by and between the Bank and Clinton E. Stein, effective May 31, 2019 | Incorporated by reference to Exhibit 10.4 of the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2019 |
| Exhibit# | Description | Location |
|---|---|---|
| 10.23** | Columbia State Bank Endorsement Method Split Dollar Agreement, effective January 15, 2013, by and between Columbia State Bank and Christopher Merrywell | Incorporated by reference to Exhibit 10.58 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 |
| 10.24** | First Amendment to the Columbia State Bank Endorsement Method Split Dollar Agreement, dated November 23, 2020, by and between Columbia State Bank and Christopher Merrywell | Incorporated by reference to Exhibit 10.59 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 |
| 10.25** | Columbia State Bank Endorsement Method Split Dollar Agreement, dated November 25, 2020 by and between Columbia State Bank and Aaron Deer | Incorporated by reference to Exhibit 10.60 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 |
| 10.26** | Executive Supplemental Compensation Agreement dated as of March 25, 2015 between Columbia State Bank and Christopher M. Merrywell | Incorporated by reference to Exhibit 10.65 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 |
| 10.27** | Executive Supplemental Compensation Agreement dated as of February 1, 2018 between Columbia State Bank and Christopher Merrywell | Incorporated by reference to Exhibit 10.66 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2020 |
| 10.28** | Form of Columbia State Bank Executive Supplemental Compensation Agreement | Filed herewith |
| 10.29** | Letter Agreement, dated as of March 1, 2023, by and between Columbia Banking System, Inc. and Ronald Farnsworth | Incorporated by reference to Exhibit 10.2 of the Company’s Current Report on Form 8-K filed March 1, 2023 |
| 10.30** | Letter Agreement, dated as of March 1, 2023, by and between Columbia Banking System, Inc. and Lisa White | Incorporated by reference to Exhibit 10.3 of the Company’s Current Report on Form 8-K filed March 1, 2023 |
| 10.31** | Letter Agreement, dated as of March 1, 2023, by and between Columbia Banking System, Inc. and Aaron Deer | Incorporated by reference to Exhibit 10.4 of the Company’s Current Report on Form 8-K filed March 1, 2023 |
| 10.32** | Letter Agreement, dated as of March 1, 2023, by and between Columbia Banking System, Inc. and Eric Eid | Incorporated by reference to Exhibit 10.5 of the Company’s Current Report on Form 8-K filed March 1, 2023 |
| 10.33** | Letter Agreement, dated as of March 1, 2023, by and between Columbia Banking System, Inc. and Christopher Merrywell | Incorporated by reference to Exhibit 10.6 of the Company’s Current Report on Form 8-K filed March 1, 2023 |
| 10.34** | Letter Agreement, dated as of March 1, 2023, by and between Columbia Banking System, Inc. and Drew Anderson | Incorporated by reference to Exhibit 10.6 of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 |
| 10.35** | Letter Agreement, dated as of March 1, 2023, by and between Columbia Banking System, Inc. and Sheri Burns | Incorporated by reference to Exhibit 10.7 of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 |
| 10.36** | Letter Agreement, dated as of March 1, 2023, by and between Columbia Banking System, Inc. and Frank Namdar | Incorporated by reference to Exhibit 10.8 of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 |
| Exhibit# | Description | Location |
|---|---|---|
| 10.37** | Letter Agreement, dated as of March 1, 2023, by and between Columbia Banking System, Inc. and Tory Nixon | Incorporated by reference to Exhibit 10.9 of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 |
| 10.38** | Letter Agreement, dated as of March 1, 2023, by and between Columbia Banking System, Inc. and Andrew Ognall | Incorporated by reference to Exhibit 10.10 of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 |
| 10.39** | Letter Agreement, dated as of March 1, 2023, by and between Columbia Banking System, Inc. and Kumi Baruffi | Incorporated by reference to Exhibit 10.11 of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 |
| 10.40** | Letter Agreement, dated as of March 1, 2023, by and between Columbia Banking System, Inc. and Lisa Dow | Incorporated by reference to Exhibit 10.12 of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 |
| 10.41** | Letter Agreement, dated as of March 1, 2023, by and between Columbia Banking System, Inc. and David Moore Devine | Incorporated by reference to Exhibit 10.13 of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 |
| 10.42** | Second Amendment to the Columbia State Bank Supplemental Executive Retirement Plan Agreement, dated as of February 28, 2023, by and between Columbia State Bank and Kumi Baruffi | Incorporated by reference to Exhibit 10.14 of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 |
| 10.43** | Columbia Banking System, Inc. 2023 Deferred Compensation Plan | Incorporated by reference to Exhibit 10.7 of the Company’s Current Report on Form 8-K filed March 1, 2023 |
| 10.44** | First Amendment to Columbia Banking System, Inc. 2023 Deferred Compensation Plan, dated as of April 18, 2023 | Incorporated by reference to Exhibit 10.16 of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2023 |
| 10.45** | Umpqua Bank Nonqualified Deferred Compensation Plan, Revised and Restated January 1, 2024 | Incorporated by reference to Exhibit 10.71 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2023 |
| 10.46** | Form of Umpqua Bank Endorsement Method Split Dollar Agreement | Incorporated by reference to Exhibit 10.2 of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2024 |
| 10.47** | Columbia Banking System, Inc. 2024 Equity Incentive Plan | Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed May 9, 2024 |
| 10.48** | Columbia Banking System, Inc. Form of Restricted Stock Agreement | Incorporated by reference to Exhibit 10.2 of the Company’s Current Report on Form 8-K filed May 9, 2024 |
| 10.49** | Columbia Banking System, Inc. Form of Restricted Stock Unit Agreement | Incorporated by reference to Exhibit 10.3 of the Company’s Current Report on Form 8-K filed May 9, 2024 |
| 10.50** | Columbia Banking System, Inc. Form of Performance Stock Unit Agreement (ROTCE) | Incorporated by reference to Exhibit 10.4 of the Company’s Current Report on Form 8-K filed May 9, 2024 |
| Exhibit# | Description | Location |
|---|---|---|
| 10.51** | Columbia Banking System, Inc. Form of Performance Stock Unit Agreement (TSR) | Incorporated by reference to Exhibit 10.5 of the Company’s Current Report on Form 8-K filed May 9, 2024 |
| 10.52** | Second Amendment to Amended and Restated Employee Stock Purchase Plan of Columbia Banking System, Inc. | Incorporated by reference to Exhibit 10.6 of the Company’s Current Report on Form 8-K filed May 9, 2024 |
| 10.53** | Columbia Banking System, Inc. Executive Change in Control and Severance Plan | Incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2024 |
| 10.54** | Columbia Banking System, Inc. Form of Participation Agreement | Incorporated by reference to Exhibit 10.2 of the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2024 |
| 10.55** | Columbia Banking System, Inc. Form of Participation Agreement | Incorporated by reference to Exhibit 10.81 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 |
| 10.56** | Form of First Amendment to the Umpqua Bank Endorsement Method Split Dollar Agreement | Incorporated by reference to Exhibit 10.82 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 |
| 10.57** | First Amendment to the First Amended and Restated Umpqua Bank Endorsement Method Split Dollar Agreement, dated October 18, 2024, by and between Umpqua Bank and Aaron Deer | Incorporated by reference to Exhibit 10.83 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 |
| 10.58** | First Amendment to the First Amended and Restated Umpqua Bank Endorsement Method Split Dollar Agreement, dated October 28, 2024, by and between Umpqua Bank and Christopher Merrywell | Incorporated by reference to Exhibit 10.84 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 |
| 10.59** | First Amendment to the First Amended and Restated Umpqua Bank Joint Beneficiary Agreement, dated November 12, 2024, by and between Umpqua Bank and David Moore Devine | Incorporated by reference to Exhibit 10.85 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 |
| 10.60** | First Amendment to the Umpqua Bank Endorsement Method Split Dollar Agreement, dated December 31, 2024, by and between Umpqua Bank and Kumi Baruffi | Incorporated by reference to Exhibit 10.86 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 |
| 10.61** | Third Amendment to the Umpqua Bank Endorsement Method Split Dollar Agreement, dated December 31, 2024, by and between Umpqua Bank and Kumi Baruffi | Incorporated by reference to Exhibit 10.87 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 |
| 10.62** | Third Amendment to the Umpqua Bank Endorsement Method Split Dollar Agreement, dated November 12, 2024, by and between Umpqua Bank and Lisa Dow | Incorporated by reference to Exhibit 10.88 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 |
| 10.63** | First Amendment to the Umpqua Bank Endorsement Method Split Dollar Agreement, dated November 12, 2024, by and between Umpqua Bank and Lisa Dow | Incorporated by reference to Exhibit 10.89 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 |
| Exhibit# | Description | Location |
| 10.64** | First Amendment to the First Amended and Restated Umpqua Bank Endorsement Method Split Dollar Agreement, dated October 30, 2024, by and between Umpqua Bank and Clinton Stein | Incorporated by reference to Exhibit 10.91 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 |
| 10.65** | Umpqua Bank Endorsement Method Split Dollar Agreement, dated November 27, 2024, by and between Umpqua Bank and Ronald L. Farnsworth | Incorporated by reference to Exhibit 10.92 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 |
| 10.66** | Offer Letter, dated as of July 10, 2025, by and between Columbia Bank and Ivan Seda | Filed herewith |
| 10.67** | Consulting Agreement, dated as of September 2, 2025, by and among Columbia, Columbia Bank and Steven R. Gardner | Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed on September 2, 2025 |
| 10.68** | Leadership Transition Letter Agreement, dated as of October 31, 2025, by and among Columbia, Columbia Bank and Ronald L. Farnsworth | Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed on November 4, 2025 |
| 10.69** | Leadership Transition Letter Agreement, dated as of November 19, 2025, by and among Columbia, Columbia Bank and Lisa White | Filed herewith |
| 19.1 | Columbia Banking System, Inc. Insider Trading Policy and Procedures | Filed herewith |
| 21.1 | Subsidiaries of the Company | Filed herewith |
| 23.1 | Consent of Deloitte & Touche LLP | Filed herewith |
| 31.1 | Certification of Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 | Filed herewith |
| 31.2 | Certification of Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 | Filed herewith |
| 31.3 | Certification of Principal Accounting Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 | Filed herewith |
| 32 | Certification of Chief Executive Officer, Principal Financial Officer and Principal Accounting Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 | Filed herewith |
| Exhibit# | Description | Location |
| 97.1 | Columbia Banking System, Inc. Policy for the Recovery of Erroneously Awarded Incentive-based Compensation, dated October 22, 2024 | Incorporated by reference to Exhibit 97.1 of the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 |
| 101 | The following financial information from Columbia Banking System, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2025 is formatted in XBRL: (i) Audited Consolidated Balance Sheets, (ii) Audited Consolidated Statements of Income, (iii) Audited Consolidated Statements of Comprehensive Income, (iv) Audited Consolidated Statements of Changes in Shareholders’ Equity, (v) Audited Consolidated | Filed herewith |
| 104 | Cover Page Interactive Data File (the cover page XBRL tags are embedded within the Inline XBRL) | Filed herewith |
** Management contract or compensatory plan or arrangement
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