NORTHWEST NATURAL GAS CO
For the period ended Dec 31, 2025. Filed Feb 27, 2026.
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FY2025 · Filed Feb 27, 2026
NWN$52.02+0.5%Stored close · as of Nov 9, 2026
Extracted filing text, with the paragraph anchors used by the comparison.
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EXHIBIT INDEX
Exhibit Index to Annual Report on Form 10-K
For the Fiscal Year Ended December 31, 2025
Exhibit Number Document
| *3a. | Amended and Restated Articles of Incorporation of Northwest Natural Holding Company (incorporated by reference to Exhibit 3.1 to the Form 8-K dated October 1, 2018, File No. 1-38681). |
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| *3b. | Amended and Restated Articles of Incorporation of Northwest Natural Gas Company (incorporated by reference to Exhibit 3b to Form 10-K for the year ended December 31, 2020, File No. 1-15973). |
| *3c. | Amended and Restated Bylaws of Northwest Natural Holding Company (incorporated by reference to Exhibit 3.1 to the Form 8-K dated July 25, 2025, File No. 1-38681). |
| *3d. | Amended and Restated Bylaws of Northwest Natural Gas Company (incorporated by reference to Exhibit 3.2 to the Form 10-Q for the quarter ended June 30, 2025, File No. 1-15973). |
| *4a. | Copy of Mortgage and Deed of Trust of Northwest Natural Gas Company, dated as of July 1, 1946 (Mortgage and Deed of Trust), to Bankers Trust (to whom Deutsche Bank Trust Company Americas is the successor), Trustee (incorporated by reference to Exhibit 7(j) in File No. 2-6494); and copies of Supplemental Indentures Nos. 1 through 14 to the Mortgage and Deed of Trust, dated respectively, as of June 1, 1949, March 1, 1954, April 1, 1956, February 1, 1959, July 1, 1961, January 1, 1964, March 1, 1966, December 1, 1969, April 1, 1971, January 1, 1975, December 1, 1975, July 1, 1981, June 1, 1985 and November 1, 1985 (incorporated by reference to Exhibit 4(d) in File No. 33-1929); Supplemental Indenture No. 15 to the Mortgage and Deed of Trust, dated as of July 1, 1986 (filed as Exhibit 4(c) in File No. 33-24168); Supplemental Indentures Nos. 16, 17 and 18 to the Mortgage and Deed of Trust, dated, respectively, as of November 1, 1988, October 1, 1989 and July 1, 1990 (incorporated by reference to Exhibit 4(c) in File No. 33-40482); Supplemental Indenture No. 19 to the Mortgage and Deed of Trust, dated as of June 1, 1991 (incorporated by reference to Exhibit 4(c) in File No. 33-64014). |
| *4b. | Supplemental Indenture No. 20 to the Mortgage and Deed of Trust, dated as of June 1, 1993 (incorporated by reference to Exhibit 4a.(1) to Form 10-K for year ended December 31, 1993, File No. 0-00994). |
| *4c. | Supplemental Indenture No. 21 to the Mortgage and Deed of Trust, dated as of October 15, 2012 (incorporated by reference to Exhibit 4.1 to Form 8-K dated October 26, 2012, File No. 1-15973). |
| *4d. | Supplemental Indenture No. 22 to the Mortgage and Deed of Trust, dated as of November 1, 2016 (incorporated by reference to Exhibit 4.1 to Form 10-Q for the quarter ended September 30, 2016, File No. 1-15973). |
| *4e. | Supplemental Indenture No. 23 to the Mortgage and Deed of Trust, dated as of September 1, 2018 (incorporated by reference to Exhibit 4(a) to Form 8-K dated September 10, 2018, File No. 1-15973). |
| *4f. | Twenty-fourth Supplemental Indenture, providing for, among other things, First Mortgage Bonds, 4.78% Series due 2052, dated as of September 1, 2022, by and between Northwest Natural Gas Company and Deutsche Bank Trust Company Americas (incorporated by reference to Exhibit 4.1 to the Form 8-K filed September 30, 2022, file No. 1-15973). |
| *4g. | Twenty-fifth Supplemental Indenture, providing for, among other things, First Mortgage Bonds, 5.43% Series due 2053, dated as of December 1, 2022, by and between Northwest Natural Gas Company and Deutsche Bank Trust Company Americas (incorporated by reference to Exhibit 4.1 to Form 8-K dated December 1, 2022, File No. 1-15973). |
| *4h. | Twenty-sixth Supplemental Indenture, providing for, among other things, First Mortgage Bonds, 5.18% Series due 2034 and 5.23% Series due 2038, dated as of July 1, 2023, by and between Northwest Natural Gas Company and Deutsche Bank Trust Company Americas (incorporated by reference to Exhibit 4.1 to the Form 8-K filed August 7, 2023, file No. 1-15973). |
| *4i. | Supplemental Indenture No. 27 to the Mortgage and Deed of Trust, dated as of July 1, 2024 (incorporated by reference to Exhibit 4 to the Form 10-Q for the quarter ended June 30, 2024, File No. 1-15973). |
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| *4j. | Twenty-eighth Supplemental Indenture to the Mortgage and Deed of Trust, providing for, among other things, First Mortgage Bonds, 5.13% Series due 2036 and 5.90% Series due 2055, dated as of December 1, 2025, by and between Northwest Natural Gas Company and Deutsche Bank Trust Company Americas (incorporated by reference to Exhibit 4.1 to Form 8-K dated December 16, 2025, File No. 1-15973). |
| *4k. | Copy of Indenture, dated as of June 1, 1991, between Northwest Natural Gas Company and Bankers Trust Company (to whom Deutsche Bank Trust Company Americas is successor), Trustee, relating to Northwest Natural Gas Company's Unsecured Debt Securities (incorporated by reference to Exhibit 4(e) in File No. 33-64014). |
| *4l. | Indenture (For Unsecured Subordinated Debt Securities) dated as of March 1, 2025 (incorporated by reference to Exhibit 4(a) to the Form 8-K filed March 18, 2025, File No. 1-38681). |
| *4m | Officer’s Certificate dated as of March 12, 2025, establishing the terms of the Junior Subordinated Debentures Supplemental to the Indenture (incorporated by reference Exhibit 4(b) to the Form 8-K filed March 18, 2025. |
| *4n. | Description of Northwest Natural Holding Company’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 (incorporated by reference to Exhibit 4(c) to the Form 8-K filed March 18, 2025, File No. 1-38681). |
| *4o. | Note Purchase Agreement dated December 14, 2023, between Northwest Natural Holding Company and the institutional investors named as purchasers therein (incorporated by reference to Exhibit 4q to Form 10-K for the year ended December 31, 2023). |
| *4p. | Note Purchase Agreement dated December 19, 2024, between Northwest Natural Holding Company and the institutional investors named as purchasers therein (incorporated by reference to Exhibit 4s to Form 10-K for the year ended December 31, 2024). |
| *10a. | Credit Agreement, dated as of June 10, 2021, among NW Natural Water Company, LLC, Northwest Natural Holding Company, the lenders party thereto, and Bank of America, N.A., as administrative agent (incorporated by reference to Exhibit 4.2 to the Form 8-K filed June 14, 2021, File No. 1-38681). |
| *10b. | Uncommitted Letter of Credit and Reimbursement Agreement dated January 5, 2024, among Northwest Natural Gas Company, the lenders party thereto, and Canadian Imperial Bank of Commerce, New York Branch, as administrative agent (incorporated by reference to Exhibit 4r to Form 10-K for the year ended December 31, 2023, File No. 1-15973). |
| *10c. | Term Loan Credit Agreement, dated as of January 6, 2025 among Northwest Natural Holding Company, the lenders party thereto, with U.S. Bank National Association, as administrative agent and sole bookrunner and lead arranger (incorporated by reference to Exhibit 4t to Form 10-K for the year ended December 31, 2024, File No. 1-38681) |
| *10d. | Amendment No. 1 to Term Loan Agreement, dated as of November 3, 2025, among Northwest Natural Holding Company, the lenders party thereto, with U.S. Bank National Association, as administrative agent and sole bookrunner and lead arranger (incorporated by reference to Exhibit 10.5 to Form 10-Q for the quarter ended September 30, 2025, File No. 1-38681). |
| *10e. | Amended and Restated Credit Agreement, dated as of November 3, 2025, among Northwest Natural Holding Company and the lenders party thereto, with JPMorgan Chase Bank, N.A. as administrative agent and Bank of America, N.A., U.S. Bank National Association, and Wells Fargo Bank, National Association, as co-syndication agents (incorporated by reference to Exhibit 10.2 to Form 10-Q for the quarter ended September 30, 2025, File No. 1-38681). |
| *10f. | Amended and Restated Credit Agreement, dated as of November 3, 2025, among Northwest Natural Gas Company and the lenders party thereto, with JPMorgan Chase Bank, N.A. as administrative agent and Bank of America, N.A., U.S. Bank National Association, and Wells Fargo Bank, National Association, as co-syndication agents (incorporated by reference to Exhibit 10.3 to Form 10-Q for the quarter ended September 30, 2025, File No. 1-15973). |
| *10g. | Credit Agreement, dated as of November 3, 2025, among SiEnergy Holding, LLC and the lenders party thereto, with JPMorgan Chase Bank, N.A. as administrative agent and Bank of America, N.A., U.S. Bank National Association, and Wells Fargo Bank, National Association, as co-syndication agents (incorporated by reference to Exhibit 10.4 to Form 10-Q for the quarter ended September 30, 2025, File No. 1-38681). |
| 19 | Northwest Natural Holding Company Inside Information and Trading Policies and Procedures. |
| 21 | Subsidiaries of Northwest Natural Holding Company. |
| 23a. | Consent of PricewaterhouseCoopers LLP - NW Holdings. |
| 23b. | Consent of PricewaterhouseCoopers LLP - NW Natural. |
| 31.1 | Certification of Principal Executive Officer of Northwest Natural Gas Company Pursuant to Rule 13a-14(a)/15d-14(a), Section 302 of the Sarbanes-Oxley Act of 2002. |
| 31.2 | Certification of Principal Financial Officer of Northwest Natural Gas Company Pursuant to Rule 13a-14(a)/15d-14(a), Section 302 of the Sarbanes-Oxley Act of 2002. |
| 31.3 | Certification of Principal Executive Officer of Northwest Natural Holding Company Pursuant to Rule 13a-14(a)/15d-14(a), Section 302 of the Sarbanes-Oxley Act of 2002. |
| 31.4 | Certification of Principal Financial Officer of Northwest Natural Holding Company Pursuant to Rule 13a-14(a)/15d-14(a), Section 302 of the Sarbanes-Oxley Act of 2002. |
| **32.1 | Certification of Principal Executive Officer and Principal Financial Officer of Northwest Natural Gas Company Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. |
| **32.2 | Certification of Principal Executive Officer and Principal Financial Officer of Northwest Natural Holding Company Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. |
| *97 | Northwest Natural Holding Company Compensation Recovery Policy, effective as of December 1, 2023 (incorporated by reference to Exhibit 97 to Form 10-K for the year ended December 31, 2023, File No. 1-38681). |
| 101 | The following materials formatted in Inline Extensible Business Reporting Language (Inline XBRL):(i) Consolidated Statements of Income;(ii) Consolidated Balance Sheets;(iii) Consolidated Statements of Cash Flows; and(iv) Related notes. |
| 104 | The cover page from the Company's Annual Report on Form 10-K for the year ended December 31, 2025, formatted in Inline XBRL and contained in Exhibit 101. |
| Executive Compensation Plans and Arrangements: | |
|---|---|
| *10h. | Executive Supplemental Retirement Income Plan, 2018 Restatement (incorporated herein by reference to Exhibit 10.6 to the Form 8-K dated October 1, 2018, File No. 1-38681). |
| *10i. | Supplemental Executive Retirement Plan of Northwest Natural Gas Company, 2018 Restatement, as amended July 25, 2019 (incorporated by reference to Exhibit 10.1 to the Form 10-Q for the quarter ended June 30, 2019, File No. 1-15973). |
| *10j. | Northwest Natural Gas Company Supplemental Trust, effective January 1, 2005, restated as of October 1, 2018 (incorporated by reference to Exhibit 10.9 to the Form 8-K dated October 1, 2018, File No. 1-38681). |
| *10k. | Northwest Natural Gas Company Umbrella Trust for Directors, effective January 1, 1991, restated as of October 1, 2018 (incorporated by reference to Exhibit 10.11 to the Form 8-K dated October 1, 2018, File No. 1-38681). |
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| *10l. | Northwest Natural Gas Company Umbrella Trust for Executives, effective January 1, 1988, restated as of October 1, 2018 (incorporated by reference to Exhibit 10.10 to the Form 8-K dated October 1, 2018, File No. 1-38681). |
| *10m. | Executive Deferred Compensation Plan, effective as of January 1, 1987, restated as of October 1, 2018 (incorporated by reference to Exhibit 10.4 to the Form 8-K dated October 1, 2018, File No. 1-38681). |
| *10n. | Directors Deferred Compensation Plan, effective June 1, 1981, restated as of October 1, 2018 (incorporated by reference to Exhibit 10.5 to the Form 8-K dated October 1, 2018, File No. 1-38681). |
| *10o. | Deferred Compensation Plan for Directors and Executives, effective January 1, 2005, restated as of August 1, 2025 (incorporated by reference to Exhibit 10.1 to the Form 10-Q for the quarter ended June 30, 2025, File No. 1-38681). |
| *10p. | Form of Indemnity Agreement as entered into between Northwest Natural Gas Company and each director and certain executive officers (incorporated by reference to Exhibit 10.1 to Form 10-Q the quarter ended September 30, 2023, File No. 1-15973). |
| *10q. | Form of Indemnity Agreement as entered into between Northwest Natural Holding Company and each director and certain executive officers (incorporated by reference to Exhibit 10.2 to Form 10-Q for the quarter ended September 30, 2023, File No. 1-38681). |
| *10r. | Executive Annual Incentive Plan, effective February 22, 2024 (incorporated by reference to Exhibit 10m to Form 10-K for the fiscal year ended December 31, 2023, File No. 1-15973). |
| *10s. | 2025 Executive Annual Incentive Plan, effective January 1, 2025 (incorporated by reference to Exhibit 10m to Form 10-K for the fiscal year ended December 31, 2024, File No. 1-15973). |
| 10t. | 2026 Executive Annual Incentive Plan, effective January 1, 2026. |
| *10u. | Form of Change in Control Severance Agreement between Northwest Natural Gas Company and David Anderson, as amended and restated as of February 23, 2023 (incorporated by reference to Exhibit 10o to Form 10-K for 2022, File No. 1-15973). |
| *10v. | Form of Change in Control Severance Agreement between Northwest Natural Gas Company and Justin B. Palfreyman, as amended and restated as of February 27, 2025 (incorporated by reference to Exhibit 10o to Form 10-K for 2024, File No. 1-15973). |
| *10w. | Form of Change in Control Severance Agreement between Northwest Natural Gas Company and each executive officer (other than David Anderson and Justin Palfreyman), as amended and restated as of February 23, 2023 (incorporated by reference to Exhibit 10p to Form 10-K for 2022, File No. 1-15973). |
| *10x. | Northwest Natural Holding Company Long Term Incentive Plan, as amended and restated as of October 1, 2018 (incorporated by reference to Exhibit 10.1 to Form 8-K dated October 1, 2018, File No. 1-38681). |
| *10y. | Northwest Natural Holding Company Long Term Incentive Plan, as amended and restated as of February 23, 2023 (incorporated by reference to Exhibit 10s to Form 10-K for 2022, File No. 1-38681). |
| *10z. | Northwest Natural Holding Company Long Term Incentive Plan, as amended and restated as of February 22, 2024 (incorporated by reference to Exhibit 10s to Form 10-K for 2023, File No. 1-38681). |
| *10aa. | Northwest Natural Holding Company Long Term Incentive Plan, as amended and restated as of May 22, 2025 (incorporated by reference to Exhibit 10.1 to the Form 8-K filed May 27, 2025, File No. 1-38681). |
| *10bb. | Form of Performance Share Long Term Incentive Agreement under Long Term Incentive Plan (2023-2025) (incorporated by reference to Exhibit 10x to Form 10-K for 2022, File No. 1-38681). |
| *10cc. | Form of Performance Share Long Term Incentive Agreement under Long Term Incentive Plan (2024-2026) (incorporated by reference to Exhibit 10x to the Form 10-K for 2023, File No. 1-38681). |
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| *10dd. | Form of Performance Share Long Term Incentive Agreement under Long Term Incentive Plan (2025-2027) (incorporated by reference to Exhibit 10x to the Form 10-K for 2024, File No. 1-38681). |
| 10ee. | Form of Performance Share Long Term Incentive Agreement under Long Term Incentive Plan (2026-2028). |
| *10ff. | Form of Consent dated December 14, 2006 entered into by each executive officer with respect to amendments to the Executive Supplemental Retirement Income Plan, the Supplemental Executive Retirement Plan and certain change in control severance agreements (incorporated by reference to Exhibit 10.1 to Form 8-K dated December 19, 2006, File No. 1-15973). |
| *10gg. | Consent to Amendment of Deferred Compensation Plan for Directors and Executives, dated February 28, 2008 entered into by each executive officer (incorporated by reference to Exhibit 10bb to Form 10-K for 2007, File No. 1-15973). |
| 10hh. | Form of Restricted Stock Unit Award Agreement under Long Term Incentive Plan (2026) |
| *10ii. | Form of Restricted Stock Unit Award Agreement under Long Term Incentive Plan (2025) (incorporated by reference to Exhibit 10aa to the Form 10-K for 2024, File No. 1-38681). |
| *10jj. | Form of Restricted Stock Unit Award Agreement under Long Term Incentive Plan (2024) (incorporated by reference to Exhibit 10bb to Form 10-K for 2023, File No. 1-38681). |
| *10kk. | Form of Restricted Stock Unit Award Agreement under Long Term Incentive Plan (2023) (incorporated by reference to Exhibit 10bb to Form 10-K for 2022, File No. 1-38681). |
| *10ll. | Form of Restricted Stock Unit Award Agreement under Long Term Incentive Plan (2022) (incorporated by reference to Exhibit 10z to Form 10-K for 2021, File No. 1-38681). |
| *10mm. | Form of Amendment of Award Agreements, dated February 22, 2024, entered into by each executive officer (incorporated by reference to Exhibit 10gg to Form 10-K for 2023, File No. File No. 1-38681). |
| *10nn. | Special Restricted Stock Unit Award Agreement between Northwest Natural Holding Company and an executive officer, dated September 1, 2024 (incorporated by reference to Exhibit 10b to the Form 10-Q for the quarter ended September 30, 2024, File No. 1-38681). |
| *10oo. | Special Restricted Stock Unit Award Agreement between Northwest Natural Holding Company and an executive officer, dated March 1, 2025. |
*Incorporated by reference as indicated
**Pursuant to Item 601(b)(32)(ii) of Regulation S-K, this certificate is not being "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.
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