NWN / Northwest Natural Holding Company - Zgłoszenia SEC, Raport roczny, o pełnomocnictwie

Northwest Natural Holding Company
US ˙ NYSE ˙ US66765N1054

Podstawowe statystyki
LEI 254900PSJL6ZEC8FR782
CIK 1733998
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Northwest Natural Holding Company
SEC Filings (Chronological Order)
Na tej stronie znajduje się pełna, chronologiczna lista zgłoszeń SEC, z wyłączeniem zgłoszeń własności, które udostępniamy gdzie indziej.
June 5, 2026 EX-4.1

Northwest Natural Holding Company $50,000,000 5.35% Senior Notes, Series E, due June 4, 2031 $10,000,000 5.35% Senior Notes, Series F, due August 5, 2031 $60,000,000 5.83% Senior Notes, Series G, due August 5, 2036 Note Purchase Agreement Dated June

Exhibit 4.1 Execution Version Northwest Natural Holding Company $50,000,000 5.35% Senior Notes, Series E, due June 4, 2031 $10,000,000 5.35% Senior Notes, Series F, due August 5, 2031 $60,000,000 5.83% Senior Notes, Series G, due August 5, 2036 Note Purchase Agreement Dated June 4, 2026 Table of Contents Section Heading Page Section 2. Sale and Purchase of Notes 1 Section 3. Execution; Closing 2 S

June 5, 2026 8-K

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): June 4, 2026 NORTHWEST NATURAL HO

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): June 4, 2026 NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction of

June 1, 2026 8-K

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 May 28, 2026 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOL

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 May 28, 2026 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction of i

May 6, 2026 EX-99.1

2026 – 20302

Exhibit 99.1 For Immediate Release May 6, 2026 NW Natural Holdings Reports Strong First Quarter 2026 Results PORTLAND, ORE. — Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings or the Company) reported financial results and highlights including: First Quarter 2026 Highlights •Reported earnings per share (EPS) of $2.33 for the first quarter of 2026, compared to EPS of $2.18 and adju

May 6, 2026 8-K

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 May 6, 2026 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLD

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 May 6, 2026 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its charter

May 6, 2026 8-K

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 May 6, 2026 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLD

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 May 6, 2026 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its charter

May 6, 2026 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2026 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GA

May 6, 2026 EX-99.1

2026 – 20302

Exhibit 99.1 For Immediate Release May 6, 2026 NW Natural Holdings Reports Strong First Quarter 2026 Results PORTLAND, ORE. — Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings or the Company) reported financial results and highlights including: First Quarter 2026 Highlights •Reported earnings per share (EPS) of $2.33 for the first quarter of 2026, compared to EPS of $2.18 and adju

May 6, 2026 EX-10.1

REIMBURSEMENT AGREEMENT AND CONTINUING INDEMNITY RELATING TO STANDBY LETTERS OF CREDIT/LETTERS OF GUARANTEE Dated May 1, 2026

Exhibit 10.1 REIMBURSEMENT AGREEMENT AND CONTINUING INDEMNITY RELATING TO STANDBY LETTERS OF CREDIT/LETTERS OF GUARANTEE Dated May 1, 2026 IN CONSIDERATION of The Toronto-Dominion Bank, New York Branch (“Bank”) issuing or amending, in its sole discretion from time to time, its Irrevocable Standby Letter of Credit or Irrevocable Letter of Guarantee in an aggregate undrawn face amount not to exceed

May 6, 2026 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2026 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GA

May 6, 2026 EX-10.1

REIMBURSEMENT AGREEMENT AND CONTINUING INDEMNITY RELATING TO STANDBY LETTERS OF CREDIT/LETTERS OF GUARANTEE Dated May 1, 2026

Exhibit 10.1 REIMBURSEMENT AGREEMENT AND CONTINUING INDEMNITY RELATING TO STANDBY LETTERS OF CREDIT/LETTERS OF GUARANTEE Dated May 1, 2026 IN CONSIDERATION of The Toronto-Dominion Bank, New York Branch (“Bank”) issuing or amending, in its sole discretion from time to time, its Irrevocable Standby Letter of Credit or Irrevocable Letter of Guarantee in an aggregate undrawn face amount not to exceed

April 17, 2026 ARS

ARS

2025 ANNUAL REPORTOur Core Values Integrity Safety Caring Service Ethic Environmental Stewardship Our Vision Lead in service excellence, innovation and environmental stewardship by harnessing our passion for customers.

April 17, 2026 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant  ☑        Filed by a Party other than the Registrant  ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as

April 17, 2026 ARS

ARS

2025 ANNUAL REPORTOur Core Values Integrity Safety Caring Service Ethic Environmental Stewardship Our Vision Lead in service excellence, innovation and environmental stewardship by harnessing our passion for customers.

March 24, 2026 8-K

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) March 23, 2026 NORTHWEST NATURAL H

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) March 23, 2026 NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its char

March 24, 2026 8-K

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) March 23, 2026 NORTHWEST NATURAL H

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) March 23, 2026 NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its char

February 27, 2026 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-38681 Commission file number 1-159

February 27, 2026 EX-23.B

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

EXHIBIT 23b CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statement on Form S-3 (No.

February 27, 2026 EX-23.B

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

EXHIBIT 23b CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statement on Form S-3 (No.

February 27, 2026 EX-23.A

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

EXHIBIT 23a CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No.

February 27, 2026 EX-FILING FEES

Security Type

Exhibit 107 CALCULATION OF REGISTRATION FEE FORM S-8 (Form Type) REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 NORTHWEST NATURAL HOLDING COMPANY (Exact Name of Registrant as Specified in Its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered(1) Proposed Maximum Offering Price Per Unit(2) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Common Stock Other 1,150,000(3) $49.

February 27, 2026 EX-10.T

As amended effective February 22, 2024 NORTHWEST NATURAL GAS COMPANY EXECUTIVE ANNUAL INCENTIVE PLAN This amended Executive Annual Incentive Plan (the “Plan”) is executed by Northwest Natural Gas Company, an Oregon corporation (the “Company”), effect

exhibit10t-executiveannu As amended effective February 22, 2024 NORTHWEST NATURAL GAS COMPANY EXECUTIVE ANNUAL INCENTIVE PLAN This amended Executive Annual Incentive Plan (the “Plan”) is executed by Northwest Natural Gas Company, an Oregon corporation (the “Company”), effective February 22, 2024.

February 27, 2026 S-8

As filed with the Securities and Exchange Commission on February 27, 2026

As filed with the Securities and Exchange Commission on February 27, 2026 Registration No.

February 27, 2026 EX-19

Northwest Natural Holding Company Inside Information and Trading Policy Index No. 74 Effective Date: February 27, 2023 Last Approved by Board: February 24, 2023

EXHIBIT 19 Northwest Natural Holding Company Inside Information and Trading Policy Index No.

February 27, 2026 EX-10.EE

PERFORMANCE SHARE LONG TERM INCENTIVE AGREEMENT

EXHIBIT 10ee PERFORMANCE SHARE LONG TERM INCENTIVE AGREEMENT This Agreement is entered into as of February , 2026, between Northwest Natural Holding Company, an Oregon corporation (the “Company”), and (“Recipient”).

February 27, 2026 EX-10.OO

SPECIAL RESTRICTED STOCK UNIT AWARD AGREEMENT

EXHIBIT 10oo SPECIAL RESTRICTED STOCK UNIT AWARD AGREEMENT This Agreement is entered into as of March 1, 2025, between Northwest Natural Holding Company, an Oregon corporation (the “Company”), and (“Recipient”).

February 27, 2026 EX-19

Northwest Natural Holding Company Inside Information and Trading Policy Index No. 74 Effective Date: February 27, 2023 Last Approved by Board: February 24, 2023

EXHIBIT 19 Northwest Natural Holding Company Inside Information and Trading Policy Index No.

February 27, 2026 EX-23.A

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

EXHIBIT 23a CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No.

February 27, 2026 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-38681 Commission file number 1-159

February 27, 2026 EX-21

SUBSIDIARIES OF NORTHWEST NATURAL HOLDING COMPANY an Oregon Corporation Name of Subsidiary Jurisdiction Organized Northwest Natural Gas Company (dba NW Natural) Oregon Northwest Energy Corporation(1) Oregon NWN Gas Reserves LLC(1) Oregon NW Natural R

EXHIBIT 21 SUBSIDIARIES OF NORTHWEST NATURAL HOLDING COMPANY an Oregon Corporation Name of Subsidiary Jurisdiction Organized Northwest Natural Gas Company (dba NW Natural) Oregon Northwest Energy Corporation(1) Oregon NWN Gas Reserves LLC(1) Oregon NW Natural RNG Holding Company, LLC(1) Oregon Lexington Renewable Energy LLC(1) Delaware Dakota City Renewable Energy LLC(1) Delaware SiEnergy Operating, LLC Delaware SiEnergy Holding, LLC (fka Si Investment Co, LLC) Delaware SiEnergy Gas, LLC (fka SiEnergy, LP) Texas SiEnergy Power Solutions, LLC Texas Pines Holdings, Inc.

February 27, 2026 EX-10.T

As amended effective February 22, 2024 NORTHWEST NATURAL GAS COMPANY EXECUTIVE ANNUAL INCENTIVE PLAN This amended Executive Annual Incentive Plan (the “Plan”) is executed by Northwest Natural Gas Company, an Oregon corporation (the “Company”), effect

exhibit10t-executiveannu As amended effective February 22, 2024 NORTHWEST NATURAL GAS COMPANY EXECUTIVE ANNUAL INCENTIVE PLAN This amended Executive Annual Incentive Plan (the “Plan”) is executed by Northwest Natural Gas Company, an Oregon corporation (the “Company”), effective February 22, 2024.

February 27, 2026 EX-10.HH

RESTRICTED STOCK UNIT AWARD AGREEMENT

EXHIBIT 10hh RESTRICTED STOCK UNIT AWARD AGREEMENT This Agreement is entered into as of February , 2026, between Northwest Natural Holding Company, an Oregon corporation (the “Company”), and (“Recipient”).

February 27, 2026 8-K

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 February 27, 2026 Date of Report (Date of earliest event reported) NORTHWEST NATURA

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 February 27, 2026 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its c

February 27, 2026 EX-10.HH

RESTRICTED STOCK UNIT AWARD AGREEMENT

EXHIBIT 10hh RESTRICTED STOCK UNIT AWARD AGREEMENT This Agreement is entered into as of February , 2026, between Northwest Natural Holding Company, an Oregon corporation (the “Company”), and (“Recipient”).

February 27, 2026 EX-10.EE

PERFORMANCE SHARE LONG TERM INCENTIVE AGREEMENT

EXHIBIT 10ee PERFORMANCE SHARE LONG TERM INCENTIVE AGREEMENT This Agreement is entered into as of February , 2026, between Northwest Natural Holding Company, an Oregon corporation (the “Company”), and (“Recipient”).

February 27, 2026 EX-10.OO

SPECIAL RESTRICTED STOCK UNIT AWARD AGREEMENT

EXHIBIT 10oo SPECIAL RESTRICTED STOCK UNIT AWARD AGREEMENT This Agreement is entered into as of March 1, 2025, between Northwest Natural Holding Company, an Oregon corporation (the “Company”), and (“Recipient”).

February 27, 2026 EX-21

SUBSIDIARIES OF NORTHWEST NATURAL HOLDING COMPANY an Oregon Corporation Name of Subsidiary Jurisdiction Organized Northwest Natural Gas Company (dba NW Natural) Oregon Northwest Energy Corporation(1) Oregon NWN Gas Reserves LLC(1) Oregon NW Natural R

EXHIBIT 21 SUBSIDIARIES OF NORTHWEST NATURAL HOLDING COMPANY an Oregon Corporation Name of Subsidiary Jurisdiction Organized Northwest Natural Gas Company (dba NW Natural) Oregon Northwest Energy Corporation(1) Oregon NWN Gas Reserves LLC(1) Oregon NW Natural RNG Holding Company, LLC(1) Oregon Lexington Renewable Energy LLC(1) Delaware Dakota City Renewable Energy LLC(1) Delaware SiEnergy Operating, LLC Delaware SiEnergy Holding, LLC (fka Si Investment Co, LLC) Delaware SiEnergy Gas, LLC (fka SiEnergy, LP) Texas SiEnergy Power Solutions, LLC Texas Pines Holdings, Inc.

February 27, 2026 EX-99.1

$2.6–2.9 billion

Exhibit 99.1 For Immediate Release Feb. 27, 2026 NW Natural Holdings Delivers Record 2025 Results Across All Businesses PORTLAND, ORE. — Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings) reported financial results and highlights including: 2025 Highlights •Reported earnings per share (EPS) of $2.77 and record adjusted EPS1 of $2.93 for 2025, compared to EPS of $2.03 and adjusted

February 27, 2026 EX-99.1

$2.6–2.9 billion

Exhibit 99.1 For Immediate Release Feb. 27, 2026 NW Natural Holdings Delivers Record 2025 Results Across All Businesses PORTLAND, ORE. — Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings) reported financial results and highlights including: 2025 Highlights •Reported earnings per share (EPS) of $2.77 and record adjusted EPS1 of $2.93 for 2025, compared to EPS of $2.03 and adjusted

February 27, 2026 8-K

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 February 27, 2026 Date of Report (Date of earliest event reported) NORTHWEST NATURA

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 February 27, 2026 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its c

December 16, 2025 8-K

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) December 16, 2025 NORTHWEST NATURA

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) December 16, 2025 NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its c

December 16, 2025 EX-4.1

===================================================================== NORTHWEST NATURAL GAS COMPANY DEUTSCHE BANK TRUST COMPANY AMERICAS (FORMERLY KNOWN AS BANKERS TRUST COMPANY),

Exhibit 4.1 ===================================================================== NORTHWEST NATURAL GAS COMPANY TO DEUTSCHE BANK TRUST COMPANY AMERICAS (FORMERLY KNOWN AS BANKERS TRUST COMPANY), As Corporate Trustee under the Mortgage and Deed of Trust, dated as of July 1, 1946, of Portland Gas & Coke Company (now Northwest Natural Gas Company) TWENTY-EIGHTH SUPPLEMENTAL INDENTURE PROVIDING, AMONG

December 15, 2025 8-K

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) December 11, 2025 NORTHWEST NATURA

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) December 11, 2025 NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its c

December 15, 2025 EX-99.1

NW Natural Holdings General Counsel Announces Retirement

Exhibit 99.1 NW Natural Holdings General Counsel Announces Retirement PORTLAND, Ore. – MardiLyn Saathoff, General Counsel for NW Natural Holding Company (NYSE: NWN) (NW Natural Holdings) announced her intent to retire on April 1, 2026, after nearly 18 years of outstanding service to the company. The Board of Directors has appointed Megan H. Berge to succeed Saathoff as SVP and General Counsel, as

November 5, 2025 EX-10.4

CREDIT AGREEMENT dated as of November 3, 2025 SIENERGY HOLDING, LLC, The Lenders Party Hereto JPMORGAN CHASE BANK, N.A., as Administrative Agent BANK OF AMERICA, N.A., U.S. BANK NATIONAL ASSOCIATION and WELLS FARGO BANK, NATIONAL ASSOCIATION, as Co-S

Exhibit 10.4 CREDIT AGREEMENT dated as of November 3, 2025 among SIENERGY HOLDING, LLC, The Lenders Party Hereto JPMORGAN CHASE BANK, N.A., as Administrative Agent BANK OF AMERICA, N.A., U.S. BANK NATIONAL ASSOCIATION and WELLS FARGO BANK, NATIONAL ASSOCIATION, as Co-Syndication Agents JPMORGAN CHASE BANK, N.A., BOFA SECURITIES, INC., U.S. BANK NATIONAL ASSOCIATION and WELLS FARGO SECURITIES, LLC,

November 5, 2025 8-K

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 November 5, 2025 Date of Report (Date of earliest event reported) NORTHWEST NATURAL

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 November 5, 2025 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its ch

November 5, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURA

November 5, 2025 EX-10.5

AMENDMENT NO. 1 TERM LOAN CREDIT AGREEMENT

EXHIBIT 10.5 AMENDMENT NO. 1 TO TERM LOAN CREDIT AGREEMENT THIS AMENDMENT NO. 1 TO TERM LOAN CREDIT AGREEMENT (this “Amendment”), dated as of November 3, 2025, is entered into by and among NORTHWEST NATURAL HOLDING COMPANY, an Oregon corporation (the “Borrower”), the lending institutions party hereto (each a “Lender” and, collectively, the “Lenders”) and U.S. BANK NATIONAL ASSOCIATION, as Administ

November 5, 2025 EX-10.3

SECOND AMENDED AND RESTATED CREDIT AGREEMENT dated as of November 3, 2025 NORTHWEST NATURAL GAS COMPANY, The Lenders Party Hereto JPMORGAN CHASE BANK, N.A., as Administrative Agent BANK OF AMERICA, N.A., U.S. BANK NATIONAL ASSOCIATION and WELLS FARGO

Exhibit 10.3 SECOND AMENDED AND RESTATED CREDIT AGREEMENT dated as of November 3, 2025 among NORTHWEST NATURAL GAS COMPANY, The Lenders Party Hereto JPMORGAN CHASE BANK, N.A., as Administrative Agent BANK OF AMERICA, N.A., U.S. BANK NATIONAL ASSOCIATION and WELLS FARGO BANK, NATIONAL ASSOCIATION, as Co-Syndication Agents JPMORGAN CHASE BANK, N.A., BOFA SECURITIES, INC., U.S. BANK NATIONAL ASSOCIAT

November 5, 2025 EX-99.1

Per Share1

Exhibit 99.1 For Immediate Release Nov. 5, 2025 NW Natural Holdings Reports Third Quarter 2025 Results Based on Strong Performance, Expect to be Above Midpoint of 2025 Guidance Range PORTLAND, ORE. — Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings) reported financial results and highlights including: •Reported a net loss of $0.73 per share for the third quarter of 2025, compared

November 5, 2025 EX-10.2

SECOND AMENDED AND RESTATED CREDIT AGREEMENT dated as of November 3, 2025 NORTHWEST NATURAL HOLDING COMPANY, The Lenders Party Hereto JPMORGAN CHASE BANK, N.A., as Administrative Agent BANK OF AMERICA, N.A., U.S. BANK NATIONAL ASSOCIATION and WELLS F

Exhibit 10.2 SECOND AMENDED AND RESTATED CREDIT AGREEMENT dated as of November 3, 2025 among NORTHWEST NATURAL HOLDING COMPANY, The Lenders Party Hereto JPMORGAN CHASE BANK, N.A., as Administrative Agent BANK OF AMERICA, N.A., U.S. BANK NATIONAL ASSOCIATION and WELLS FARGO BANK, NATIONAL ASSOCIATION, as Co-Syndication Agents JPMORGAN CHASE BANK, N.A., BOFA SECURITIES, INC., U.S. BANK NATIONAL ASSO

October 28, 2025 8-K

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 24, 2025 NORTHWEST NATURAL

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 24, 2025 NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its ch

September 2, 2025 8-K

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) August 29, 2025 NORTHWEST NATURAL

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) August 29, 2025 NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its cha

August 26, 2025 8-K

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): August 25, 2025 NORTHWEST NATURAL

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): August 25, 2025 NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction

August 5, 2025 EX-3.2

Amended and Restated Bylaws of Northwest Natural Gas Company

EXHIBIT 3.2 AMENDED AND RESTATED BYLAWS OF NORTHWEST NATURAL GAS COMPANY ARTICLE I. OFFICES Section 1. Office. The principal office of the company shall be located in the City of Portland, Oregon. The company also may have offices at such other places both within and without the State of Oregon as the board of directors from time to time may determine. Section 2. Registered Office. The registered

August 5, 2025 EX-99.1

Per Share1

Exhibit 99.1 For Immediate Release Aug. 5, 2025 NW Natural Holdings Reports Second Quarter 2025 Results Reaffirmed 2025 Adjusted EPS Guidance PORTLAND, ORE. — Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings) reported financial results and highlights including: •Reported a net loss of $0.06 per share and adjusted net income of $0.01 per share1 for the second quarter of 2025, comp

August 5, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS

August 5, 2025 EX-10.1

Deferred Compensation Plan for Directors and Executives, effective January 1, 2005, restated as of August 1, 2025.

EXHIBIT 10.1 NORTHWEST NATURAL GAS COMPANY DEFERRED COMPENSATION PLAN FOR DIRECTORS AND EXECUTIVES EFFECTIVE JANUARY 1, 2005 RESTATED EFFECTIVE AUGUST 1, 2025 TABLE OF CONTENTS Page 1 Purpose; Effective Date 1 2 Eligibility 1 3 Deferral Elections 1 4 Company Contributions for Executives 3 5 FICA Withholding on Executives 4 6 Accounts 4 7 Payment of Benefits 6 8 Supplemental Retirement Benefit 9 9

August 5, 2025 8-K

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 August 5, 2025 Date of Report (Date of earliest event reported) NORTHWEST NATURAL H

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 August 5, 2025 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its char

July 25, 2025 8-K

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 July 23, 2025 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HO

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 July 23, 2025 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction of

July 25, 2025 EX-3.1

Amended and Restated Bylaws of Northwest Natural Holding Company.

EXHIBIT 3.1 AMENDED AND RESTATED BYLAWS OF NORTHWEST NATURAL HOLDING COMPANY ARTICLE I. OFFICES Section 1. Office. The principal office of the company shall be located in the City of Portland, Oregon. The company also may have offices at such other places both within and without the State of Oregon as the board of directors from time to time may determine. Section 2. Registered Office. The registe

July 3, 2025 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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 June 30, 2025 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction of

July 3, 2025 EX-99.1

NW Natural Holdings and NW Natural Announce New Board Members

EXHIBIT 99.1 NW Natural Holdings and NW Natural Announce New Board Members New Directors Bring Extensive Leadership Experience from Industry-Leading Companies July 3, 2025 PORTLAND, Ore.-(BUSINESS WIRE)- NW Natural Holding Company’s (NYSE: NWN) board of directors has appointed Peter Bragdon as a new independent director effective July 12, 2025. Bragdon has also been appointed to the board of direc

June 26, 2025 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K (Mark One) [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 [ ] TRANSITION REPORT PURSUANT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K (Mark One) [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-38681 A. Full title of the plan

June 24, 2025 8-K

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) June 23, 2025 NORTHWEST NATURAL HO

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) June 23, 2025 NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its chart

May 27, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

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 May 22, 2025 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction of i

May 27, 2025 EX-10.1

Northwest Natural Holding Company Long Term Incentive Plan (as amended as of October 1, 2018, February 23, 2023 and February 22, 2024, and May 22, 2025).

10.1 NORTHWEST NATURAL HOLDING COMPANY LONG TERM INCENTIVE PLAN (as amended as of October 1, 2018, February 23, 2023 and February 22, 2024, and May 22, 2025) 1. Purpose. The purpose of this Long Term Incentive Plan (the “Plan”) is to enable Northwest Natural Holding Company (the “Company”) to attract and retain the services of selected employees, officers and directors of the Company or of any sub

May 6, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GA

May 6, 2025 EX-99.2

NW Natural Holdings Q1 2025 Earnings Call May 6, 2025 Investor Information Company Information NW Natural Holdings 250 SW Taylor Street Portland, OR 97204 nwnaturalholdings.com Nikki Sparley Director, Investor Relations and Treasury (503) 721-2530 ni

q12025earningsreleasepre NW Natural Holdings Q1 2025 Earnings Call May 6, 2025 Investor Information Company Information NW Natural Holdings 250 SW Taylor Street Portland, OR 97204 nwnaturalholdings.

May 6, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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 May 6, 2025 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its charter

May 6, 2025 EX-99.1

Per Share1

Exhibit 99.1 For Immediate Release May 6, 2025 NW Natural Holdings Reports Solid First Quarter 2025 Results Signed Agreement to Acquire Another Texas Gas Utility; Reaffirmed 2025 Adjusted EPS Guidance PORTLAND, ORE. — Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings) reported financial results and highlights, including: •Reported earnings per share (EPS) of $2.18 and achieved adj

April 10, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒       Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as pe

April 10, 2025 ARS

ARS

2024 ANNUAL REPORT MOMENTUM FOR GROWTH GROWTH LEGACY OF STRENGTHTo Our Shareholders I was excited in 2004 to join NW Natural, a company known in our industry for operating a premier gas utility in the Pacific Northwest with a legacy of ingenuity, safety, and superior service ethic.

March 18, 2025 EX-5.(B)

The consent of Morgan, Lewis & Bockius LLP is included in its opinion filed as Exhibit 5(b).

Exhibit 5(b) March 18, 2025 Northwest Natural Holding Company 250 S.W. Taylor Street Portland, Oregon 97204 Ladies and Gentlemen: We have acted as counsel for Northwest Natural Holding Company (the “Company”) in connection with the Registration Statement on Form S-3, as amended (Registration Statement No. 333-281437) (the “Registration Statement”), relating to $325,000,000 in aggregate principal a

March 18, 2025 8-K

Financial Statements and Exhibits, Other Events

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 March 18, 2025 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction of

March 18, 2025 EX-5.(A)

The consent of MardiLyn Saathoff, Esquire is included in her opinion filed as Exhibit 5(a).

Exhibit 5(a) March 18, 2025 Northwest Natural Holding Company 250 S.W. Taylor Street Portland, Oregon 97204 Ladies and Gentlemen: I am General Counsel, Chief Compliance Officer and Senior Vice President Regulatory of Northwest Natural Holding Company, an Oregon corporation (the “Company”), and in such capacity have acted as counsel for the Company in connection with the Registration Statement on F

March 18, 2025 EX-4.(A)

Indenture (For Unsecured Subordinated Debt Securities) dated as of March 1, 2025.

DB1/ 154080392.9 NORTHWEST NATURAL HOLDING COMPANY TO U.S. BANK TRUST COMPANY, NATIONAL ASSOCIATION Trustee Indenture (For Unsecured Subordinated Debt Securities) Dated as of March 1, 2025 DB1/ 154080392.9 TABLE OF CONTENTS RECITAL OF THE COMPANY............................................................................................................... 1 ARTICLE ONE Definitions and Other Provis

March 18, 2025 EX-4.(B)

Officer’s Certificate dated as of March 12, 2025, establishing the terms of the Junior Subordinated Debentures supplemental to the Indenture.

Exhibit 4(b) NORTHWEST NATURAL HOLDING COMPANY OFFICER’S CERTIFICATE Brody J. Wilson, the Vice President, Chief Accounting Officer, Treasurer and Controller of Northwest Natural Holding Company, an Oregon corporation (the “Company”), pursuant to the authority granted in the Board Resolutions of the Company dated February 27, 2025, and Sections 102, 201 and 301 of the Subordinated Indenture defined

March 18, 2025 EX-1

Underwriting Agreement dated March 12, 2025, by and among the Company and the Underwriters named therein, relating to the Junior Subordinated Debentures.

Execution Version NORTHWEST NATURAL HOLDING COMPANY $325,000,000 7.0% Junior Subordinated Debentures due 2055 UNDERWRITING AGREEMENT Dated: March 12, 2025 i TABLE OF CONTENTS Page SECTION 1. Representations and Warranties .................................................................................2 SECTION 2. Sale and Delivery to Underwriters; Closing .........................................

March 18, 2025 EX-4.(C)

Description of Northwest Natural Holding Company’s Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934.

Exhibit 4(c) DESCRIPTION OF NORTHWEST NATURAL HOLDING COMPANY’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 General The following is a summary of certain rights and privileges of the common stock of Northwest Natural Holding Company (NW Holdings), which is registered under Section 12(b) of the Securities Exchange Act of 1934, as amended, and is traded on the New York Stock Exchange under the symbol “NWN”.

March 14, 2025 EX-FILING FEES

Calculation of Filing Fee Table (Form Type) Northwest Natural Holding Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Table S-3 (Form Type) Northwest Natural Holding Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee  Calculation  or Carry Forward Rule Amount Registered Proposed  Maximum  Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry  Forward  Form  Type  Carry  Forward  File  Number  Carry  Forward  Initial  effective  date Filing Fee  Previously  Paid In  Connection  with Unsold  Securities to  be Carried  Forward Newly Registered Securities Fees to Be Paid 1  Debt Junior Subordinated Debentures due September 15, 2055 457(r) $325,000,000 100.

March 14, 2025 424B5

NORTHWEST NATURAL HOLDING COMPANY Junior Subordinated Debentures due September 15, 2055

Filed Pursuant to Rule 424(b)(5) Registration No. 333-281437 PROSPECTUS SUPPLEMENT (to Prospectus Dated August 9, 2024) NORTHWEST NATURAL HOLDING COMPANY $325,000,000 Junior Subordinated Debentures due September 15, 2055 Northwest Natural Holding Company (NW Holdings) is offering our Junior Subordinated Debentures due September 15, 2055 (Junior Subordinated Debentures). We will pay interest on the

March 12, 2025 FWP

Northwest Natural Holding Company Junior Subordinated Debentures due September 15, 2055 (the “Junior Subordinated Debentures”) Final Terms and Conditions March 12, 2025

Filed Pursuant to Rule 433 Registration Statement No. 333-281437 Pricing Term Sheet Northwest Natural Holding Company $325,000,000 Junior Subordinated Debentures due September 15, 2055 (the “Junior Subordinated Debentures”) Final Terms and Conditions March 12, 2025 These final terms and conditions relate only to the Junior Subordinated Debentures and should be read together with Northwest Natural

March 12, 2025 424B3

SUBJECT TO COMPLETION, DATED MARCH 12, 2025

424B3 Table of Contents This preliminary prospectus supplement and the accompanying prospectus relate to an effective registration statement under the Securities Act of 1933, as amended, but are not complete and may be changed.

February 28, 2025 EX-23.B

Consent of PricewaterhouseCoopers LLP - NW Natural.

EXHIBIT 23b CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos.

February 28, 2025 EX-23.A

Consent of PricewaterhouseCoopers LLP - NW Holdings.

EXHIBIT 23a CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos.

February 28, 2025 EX-4.T

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.

ex4tusbanknorthwestnatur Exhibit 4t EXECUTION VERSION TERM LOAN CREDIT AGREEMENT dated as of January 6, 2025 among NORTHWEST NATURAL HOLDING COMPANY, as Borrower The Lenders Party Hereto, and U.

February 28, 2025 8-K

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 February 28, 2025 Date of Report (Date of earliest event reported) NORTHWEST NATURA

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 February 28, 2025 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its c

February 28, 2025 EX-19

Northwest Natural Holding Company Inside Information and Trading Policies and Procedure

EXHIBIT 19 Northwest Natural Holding Company Inside Information and Trading Policy Index No.

February 28, 2025 EX-10.X

Form of Performance Share Long Term Incentive Agreement under Long Term Incentive Plan (2025-2027).

EXHIBIT 10x PERFORMANCE SHARE LONG TERM INCENTIVE AGREEMENT This Agreement is entered into as of February , 2025, between Northwest Natural Holding Company, an Oregon corporation (the “Company”), and (“Recipient”).

February 28, 2025 EX-10.O

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.

EXHIBIT 10o April 1, 2025 Justin B. Palfreyman *** *** Re: Amended and Restated Change in Control Severance Agreement Dear Justin: Northwest Natural Gas Company, an Oregon corporation (the “Company”), a wholly-owned subsidiary of Northwest Natural Holding Company, an Oregon corporation (“Parent”), considers the establishment and maintenance of a sound and vital management to be essential to protec

February 28, 2025 EX-21

Subsidiaries of Northwest Natural Holding Company.

EXHIBIT 21 SUBSIDIARIES OF NORTHWEST NATURAL HOLDING COMPANY an Oregon Corporation Name of Subsidiary Jurisdiction Organized Northwest Natural Gas Company (dba NW Natural) Oregon Northwest Energy Corporation(1) Oregon NWN Gas Reserves LLC(1) Oregon NW Natural RNG Holding Company, LLC(1) Oregon Lexington Renewable Energy LLC(1) Delaware Dakota City Renewable Energy LLC(1) Delaware SiEnergy Operatin

February 28, 2025 EX-10.M

Executive Annual Incentive Plan, effective January 1, 2025.

ex10mexecutiveannualince EXHIBIT 10m As amended effective February 22, 2024 NORTHWEST NATURAL GAS COMPANY EXECUTIVE ANNUAL INCENTIVE PLAN This amended Executive Annual Incentive Plan (the “Plan”) is executed by Northwest Natural Gas Company, an Oregon corporation (the “Company”), effective February 22, 2024.

February 28, 2025 EX-4.V

Credit Agreement, dated as of December 22, 2020, among SiEnergy Operating, LLC, SiEnergy, L.P., Terra Transmission, LLC, SiEnergy Power Solutions, LLC, and SiEnergy GP, L.L.C., the lenders party thereto, with ING Capital LLC as administrative agent and L/C Issuer, as amended by Amendment No. 1 to the Credit Agreement, dated as of March 23, 2021, Amendment No. 2 to the Credit Agreement, dated as of July 13, 2021, Amendment No. 3 to the Credit Agreement, dated as of July 11, 2022, and Amendment No. 4 to the Credit Agreement dated as of December 22, 2023.

Exhibit 4v EXHIBIT A CONFORMED THROUGH AMENDMENT NO. 4 DATED DECEMBER 22, 2023 CREDIT AGREEMENT DATED AS OF DECEMBER 22, 2020 as amended by that certain Amendment No. 1 on March 23, 2021, as further amended by that certain Amendment No. 2 on July 13, 2021, as further amended by that certain Amendment No. 3 on July 11, 2022 and as further amended by that certain Amendment No. 4 on December 22, 2023

February 28, 2025 EX-4.U

364-Day Term Loan Credit Agreement, dated as of January 7, 2025, among Northwest Natural Holding Company, 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-documentation agents.

ex4ujpmorgantermloancred Exhibit 4u EXECUTION VERSION 364-DAY TERM LOAN CREDIT AGREEMENT dated as of January 7, 2025 among NORTHWEST NATURAL HOLDING COMPANY, The Lenders Party Hereto JPMORGAN CHASE BANK, N.

February 28, 2025 EX-99.2

NW Natural Holdings Q4 2024 Earnings Call February 28, 2025 Investor Information Company Information NW Natural Holdings 250 SW Taylor Street Portland, OR 97204 nwnaturalholdings.com Nikki Sparley Director, Investor Relations and Treasury (503) 721-2

NW Natural Holdings Q4 2024 Earnings Call February 28, 2025 Investor Information Company Information NW Natural Holdings 250 SW Taylor Street Portland, OR 97204 nwnaturalholdings.

February 28, 2025 EX-4.S

Note Purchase Agreement dated December 19, 2024, between Northwest Natural Holding Company and the institutional investors named as purchasers therein.

ex4s2024notepurchaseagre Exhibit 4s EXECUTION VERSION NORTHWEST NATURAL HOLDING COMPANY $90,000,000 5.

February 28, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-38681 Commission file number 1-159

February 28, 2025 EX-10.AA

Form of Restricted Stock Unit Award Agreement under Long Term Incentive Plan (2025).

EXHIBIT 10aa RESTRICTED STOCK UNIT AWARD AGREEMENT This Agreement is entered into as of February , 2025, between Northwest Natural Holding Company, an Oregon corporation (the “Company”), and (“Recipient”).

February 28, 2025 EX-99.1

2024 2023 Change In thousands, except per share data Amount Per Share Amount Per Share Amount Per Share Net income: Natural gas distribution segment $ 77,126 $ 1.98 $ 94,042 $ 2.59 $ (16,916) $ (0.61) Regulatory disallowance, net 10,070 0.26 — — 10,0

Exhibit 99.1 For Immediate Release Feb. 28, 2025 NW Natural Holdings Reports Fourth Quarter and Full Year 2024 Results Initiated 2025 earnings guidance and reaffirmed long-term EPS growth rate target of 4-6% PORTLAND, ORE. — Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings) reported financial results and highlights including: •Reported net income of $2.03 per share and achieved a

January 10, 2025 EX-99.1

Kim Rush named next president of NW Natural Gas Company

EXHIBIT 99.1 Kim Rush named next president of NW Natural Gas Company Highly respected, longtime executive has served in multiple leadership roles during her 26 years with the company January 9, 2025 PORTLAND, Ore. - (Business Wire) - The Board of Directors of Northwest Natural Gas Company (NW Natural) has named longtime company executive Kim Rush to serve as president, effective April 1, 2025. NW

January 10, 2025 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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) 01/09/2025 NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its charter)

January 8, 2025 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Other Events

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 January 7, 2025 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction o

January 8, 2025 EX-99.1

NW Natural Holdings Completes Acquisition of SiEnergy

EXHIBIT 99.1 FOR IMMEDIATE RELEASE: Jan. 8, 2025 NW Natural Holdings Completes Acquisition of SiEnergy Expands NWN’s presence in Texas with a rapidly growing gas utility PORTLAND, Ore. – Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings) today announced the closing of its acquisition of SiEnergy Operating, LLC (SiEnergy or the Company) from SiEnergy Capital Partners, LLC (an affil

January 6, 2025 8-K

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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 January 6, 2025 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction o

December 30, 2024 8-K

Other Events

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) December 30, 2024 NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its c

December 19, 2024 8-K

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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): December 19, 2024 NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdictio

November 18, 2024 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

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 November 17, 2024 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction

November 18, 2024 EX-99.2

NW Natural Holdings SiEnergy Acquisition November 19, 2024 Investor Information Company Information NW Natural Holdings 250 SW Taylor Street Portland, OR 97204 nwnaturalholdings.com Nikki Sparley Director, Investor Relations and Treasury (503) 721-25

NW Natural Holdings SiEnergy Acquisition November 19, 2024 Investor Information Company Information NW Natural Holdings 250 SW Taylor Street Portland, OR 97204 nwnaturalholdings.

November 18, 2024 EX-99.1

NW Natural Holdings to Acquire Rapidly Growing Gas Utility

EXHIBIT 99.1 FOR IMMEDIATE RELEASE: Nov. 18, 2024 NW Natural Holdings to Acquire Rapidly Growing Gas Utility Acquisition expands NWN’s presence in Texas PORTLAND, Ore. – Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings) today announced it entered into an agreement to acquire SiEnergy Operating, LLC (SiEnergy or the Company) from SiEnergy Capital Partners, LLC (an affiliate of Rid

November 12, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURA

November 12, 2024 EX-99.1

Nine Months Ended September 30, 2024 2023 Change In thousands, except per share data Amount Per Share Amount Per Share Amount Per Share Net income (loss): Natural Gas Distribution segment $ 32,324 $ 0.84 $ 47,520 $ 1.32 $ (15,196) $ (0.48) Other 1,54

Exhibit 99.1 For Immediate Release Nov. 12, 2024 NW Natural Holdings Reports Strong Third Quarter 2024 Results Reaffirmed 2024 guidance and long-term EPS growth rate target of 4-6% PORTLAND, ORE. — Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings) reported financial results and highlights including: •Reported a net loss of $27.2 million ($0.71 per share) for the third quarter of

November 12, 2024 EX-10.C

Special Restricted Stock Unit Award Agreement between Northwest Natural Holding Company and an executive officer, dated September 1, 2024.

EXHIBIT 10c SPECIAL RESTRICTED STOCK UNIT AWARD AGREEMENT This Agreement is entered into as of September 1, 2024, between Northwest Natural Holding Company, an Oregon corporation (the “Company”), and (“Recipient”).

November 12, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 November 12, 2024 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its c

November 12, 2024 EX-10.A

Offer Letter of Employment between Northwest Natural Gas Company and an executive officer, dated July 22, 2024 (incorporated by reference to Exhibit 10a to the Form 10-Q for the quarter ended September 30, 2024, File No. 1-15973).

EXHIBIT 10a July 22, 2024 Dear , This letter is to confirm our offer of employment for the position of Senior Vice President and Chief Financial Officer, with a starting salary of $525,000 annually and a start date to be mutually agreed upon, pursuant to NW Natural Board approval.

November 12, 2024 EX-10.B

Special Restricted Stock Unit Award Agreement between Northwest Natural Holding Company and an executive officer, dated September 1, 2024.

EXHIBIT 10b SPECIAL RESTRICTED STOCK UNIT AWARD AGREEMENT This Agreement is entered into as of September 1, 2024, between Northwest Natural Holding Company, an Oregon corporation (the “Company”), and (“Recipient”).

October 29, 2024 8-K

Regulation FD Disclosure, Other Events

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 25, 2024 NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its ch

August 22, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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 August 19, 2024 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction o

August 9, 2024 EX-5.(A)

The consent of MardiLyn Saathoff, Esquire is included in her opinion filed as Exhibit 5(a).

EX-5.(a) Exhibit 5(a) August 9, 2024 Northwest Natural Holding Company Northwest Natural Gas Company 250 SW Taylor Street Portland, Oregon 97204 Ladies and Gentlemen: I am Senior Vice President, Regulation and General Counsel of Northwest Natural Holding Company, an Oregon corporation (“NW Holdings”), and Northwest Natural Gas Company, an Oregon corporation (“NW Natural” and, together with NW Hold

August 9, 2024 EX-25.(B)

Statement of Eligibility of the Indenture Trustee on Form T-1 related to the unsecured debt securities of Northwest Natural Gas Company.

Exhibit 25(b) UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) DEUTSCHE BANK TRUST COMPANY AMERICAS (formerly BANKERS TRUST COMPANY) (Exact name of trustee as specif

August 9, 2024 EX-25.(A)

Statement of Eligibility of the Mortgage Trustee on Form T-1 related to the first mortgage bonds of Northwest Natural Gas Company.

Exhibit 25(a) UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM T-1 STATEMENT OF ELIGIBILITY UNDER THE TRUST INDENTURE ACT OF 1939 OF A CORPORATION DESIGNATED TO ACT AS TRUSTEE ☐ CHECK IF AN APPLICATION TO DETERMINE ELIGIBILITY OF A TRUSTEE PURSUANT TO SECTION 305(b)(2) DEUTSCHE BANK TRUST COMPANY AMERICAS (formerly BANKERS TRUST COMPANY) (Exact name of trustee as specif

August 9, 2024 424B5

$200,000,000 NORTHWEST NATURAL HOLDING COMPANY Common Stock

Filed Pursuant to Rule 424(b)(5) Registration No. 333-281437 PROSPECTUS SUPPLEMENT (to Prospectus Dated August 9, 2024) $200,000,000 NORTHWEST NATURAL HOLDING COMPANY Common Stock We may issue, offer and sell shares of our common stock, having an aggregate sales price of up to $200,000,000 over a period of time and from time to time through Wells Fargo Securities, LLC, or “Wells Fargo,” J.P. Morga

August 9, 2024 S-3ASR

AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 9, 2024

Table of Contents AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 9, 2024 Registration Nos.

August 9, 2024 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Table FORM S-3 (Form Type) Northwest Natural Holding Company Northwest Natural Gas Company (Exact Name of Registrants as Specified in their Charters) Table 1: Newly Registered Securities and Carry Forward Securities     Security  Type Security Class Title Fee Calculation or Carry  Forward Rule  Amount Registered Proposed Maximum Offering Price Per Unit Maximum

August 9, 2024 8-K

Regulation FD Disclosure

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) August 9, 2024 NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its char

August 9, 2024 EX-5.(B)

The consent of Morgan, Lewis & Bockius LLP is included in its opinion filed as Exhibit 5(b).

EX-5.(b) Exhibit 5(b) August 9, 2024 Northwest Natural Holding Company 250 SW Taylor Street Portland, Oregon 97204 Ladies and Gentlemen: With respect to the Registration Statement No. 333-281437 (the “Registration Statement”) filed with the Securities and Exchange Commission (the “Commission”) on August 9, 2024, by Northwest Natural Holding Company (the “Company”), relating to the offer and sale o

August 9, 2024 EX-5.(B)

The consent of Morgan, Lewis & Bockius LLP is included in its opinion filed as Exhibit 5(b).

EX-5.(b) Exhibit 5(b) August 9, 2024 Northwest Natural Holding Company Northwest Natural Gas Company 250 SW Taylor Street Portland, Oregon 97204 Ladies and Gentlemen: With respect to the joint Registration Statement on Form S-3 (the “Registration Statement”) to be filed with the Securities and Exchange Commission (the “Commission”) on or about the date hereof by Northwest Natural Holding Company (

August 9, 2024 EX-FILING FEES

Calculation of Filing Fee Table Form S-3 (Form Type) Northwest Natural Holding Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities

Exhibit 107 Calculation of Filing Fee Table Form S-3 (Form Type) Northwest Natural Holding Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered and Carry Forward Securities Security Type Security Class Title Fee Calculation or Carry Forward Rules Amount  Registered  Proposed  Maximum  Offering  Price Per  Unit  Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Carry  Forward  Form  Type  Carry  Forward  File  Number  Carry  Forward  Initial  effective  date  Filing Fee  Previously  Paid In  Connection  with  Unsold  Securities  to be  Carried  Forward  Newly Registered Securities Fees to Be Paid 1  Equity Common Stock, no par value Rule 457(o) and Rule 457(r) $200,000,000 0.

August 9, 2024 EX-23.(A)

Consent of PricewaterhouseCoopers LLP—Northwest Natural Holding Company.

EX-23.(a) Exhibit 23(a) CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of Northwest Natural Holding Company of our report dated February 23, 2024 relating to the financial statements, financial statement schedules and the effectiveness of internal control over financial reporting, which appears

August 9, 2024 EX-5.(A)

The consent of MardiLyn Saathoff, Esquire is included in her opinion filed as Exhibit 5(a).

EX-5.(a) Exhibit 5(a) August 9, 2024 Northwest Natural Holding Company 250 SW Taylor Street Portland, Oregon 97204 Ladies and Gentlemen: With respect to the Registration Statement No. 333-281437 (the “Registration Statement”) filed with the Securities and Exchange Commission (the “Commission”) on August 9, 2024, by Northwest Natural Holding Company (the “Company”), relating to the offer and sale o

August 9, 2024 EX-23.(B)

Consent of PricewaterhouseCoopers LLP—Northwest Natural Gas Company.

EX-23.(b) Exhibit 23(b) CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of Northwest Natural Gas Company of our report dated February 23, 2024 relating to the financial statements, and financial statement schedule, which appears in Northwest Natural Gas Company’s Annual Report on Form 10-K for t

August 9, 2024 8-K

Current Report

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 August 9, 2024 Date of Report (Date of earliest event reported) August 9, 2024 NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission File No. 1-38681 Oregon 82-4710680 (State or other jur

August 9, 2024 EX-99.1

NW Natural Holdings Names Raymond Kaszuba Chief Financial Officer

Exhibit 99.1 NW Natural Holdings Names Raymond Kaszuba Chief Financial Officer PORTLAND, Ore., August 9, 2024 – Northwest Natural Holding Company, (NYSE:NWN) (NW Natural Holdings), has hired Raymond (Ray) Kaszuba to serve as the company’s senior vice president and chief financial officer effective August 31, 2024. Ray comes to NW Natural Holdings from AmeriGas, the United States’ largest propane d

August 2, 2024 EX-99.1

Three Months Ended June 30, 2024 2023 Change In thousands, except per share data Amount Per Share Amount Per Share Amount Per Share Net income (loss): Natural Gas Distribution segment $ (2,987) $ (0.08) $ (271) $ (0.01) $ (2,716) $ (0.07) Other 200 0

Exhibit 99.1 For Immediate Release August 2, 2024 NW Natural Holdings Reports Second Quarter 2024 Results PORTLAND, ORE. — Northwest Natural Holding Company, (NYSE: NWN) (NW Natural Holdings), reported financial results and highlights including: •Reported a net loss of $2.8 million ($0.07 per share) for the second quarter of 2024, compared to net income of $1.2 million ($0.03 per share) for the sa

August 2, 2024 EX-4

Supplemental Indenture No. 27 to the Mortgage and Deed of Trust, dated as of July 1, 2024.

Exhibit 4 ===================================================================== NORTHWEST NATURAL GAS COMPANY TO DEUTSCHE BANK TRUST COMPANY AMERICAS (FORMERLY KNOWN AS BANKERS TRUST COMPANY), As Corporate Trustee under the Mortgage and Deed of Trust, dated as of July 1, 1946, of Portland Gas & Coke Company (now Northwest Natural Gas Company) TWENTY-SEVENTH SUPPLEMENTAL INDENTURE PROVIDING, AMONG

August 2, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 August 2, 2024 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its char

August 2, 2024 EX-3.1

Amended and Restated Bylaws of Northwest Natural Gas Company.

Exhibit 3.1 AMENDED AND RESTATED BYLAWS OF NORTHWEST NATURAL GAS COMPANY ARTICLE I. OFFICES Section 1. Office. The principal office of the company shall be located in the City of Portland, Oregon. The company also may have offices at such other places both within and without the State of Oregon as the board of directors from time to time may determine. Section 2. Registered Office. The registered

August 2, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS

July 25, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) July 24, 2024 NORTHWEST NATURAL HO

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) July 24, 2024 NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its chart

June 14, 2024 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K (Mark One) [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 [ ] TRANSITION REPORT PURSUANT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K (Mark One) [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-38681 A. Full title of the plan

May 29, 2024 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Other Events, Submission of Matters to a Vote of Security Holders

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 May 23, 2024 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction of i

May 29, 2024 EX-3.1

Amended and Restated Bylaws of Northwest Natural Holding Company.

EXHIBIT 3.1 AMENDED AND RESTATED BYLAWS OF NORTHWEST NATURAL HOLDING COMPANY ARTICLE I. OFFICES Section 1. Office. The principal office of the company shall be located in the City of Portland, Oregon. The company also may have offices at such other places both within and without the State of Oregon as the board of directors from time to time may determine. Section 2. Registered Office. The registe

May 23, 2024 EX-99.1

NW Natural Holdings and NW Natural CEO David H. Anderson Announces Retirement

EXHIBIT 99.1 NW Natural Holdings and NW Natural CEO David H. Anderson Announces Retirement Board of Directors Announces CEO Succession Plan PORTLAND, OR - (Business Wire) - 05/23/24 - NW Natural Holding Company (NYSE: NWN) (NW Natural Holdings) and NW Natural Gas Company (NW Natural) chief executive officer (CEO) David H. Anderson announced today his intent to retire on April 1, 2025. The Board of

May 23, 2024 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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) May 23, 2024 NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its charte

May 6, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 May 6, 2024 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its charter

May 6, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GA

May 6, 2024 EX-99.1

Three Months Ended March 31, 2024 2023 Change In thousands, except per share data Amount Per Share Amount Per Share Amount Per Share Net income: Natural Gas Distribution segment $ 65,715 $ 1.74 $ 71,951 $ 2.02 $ (6,236) $ (0.28) Other (1,892) (0.05)

Exhibit 99.1 For Immediate Release May 6, 2024 NW Natural Holdings Reports First Quarter 2024 Results PORTLAND, ORE. — Northwest Natural Holding Company, (NYSE: NWN) (NW Natural Holdings), reported financial results and highlights including: •Reported net income of $63.8 million ($1.69 per share) for the first quarter of 2024, compared to net income of $71.7 million ($2.01 per share) for the same

April 11, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒       Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as pe

April 11, 2024 ARS

ARS

LEGACY AND Leadership 2023 ANNUAL REPORTTo Our Shareholders You’re reading our 2023 Annual Report just a few months after we celebrated our 165th anniversary.

February 23, 2024 EX-10.S

Northwest Natural Holding Company Long Term Incentive Plan, as amended and restated as of February 22, 2024.

Exhibit 10s NORTHWEST NATURAL HOLDING COMPANY LONG TERM INCENTIVE PLAN (as amended as of October 1, 2018, February 23, 2023 and February 22, 2024) 1.

February 23, 2024 EX-4.R

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.

EXECUTION VERSION UNCOMMITTED LETTER OF CREDIT AND REIMBURSEMENT AGREEMENT dated as of January 5, 2024 among NORTHWEST NATURAL GAS COMPANY, The Lenders Party Hereto CANADIAN IMPERIAL BANK OF COMMERCE, NEW YORK BRANCH as Administrative Agent TABLE OF CONTENTS Page i 120852864.

February 23, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 February 23, 2024 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its c

February 23, 2024 EX-10.X

Form of Performance Share Long Term Incentive Agreement under Long Term Incentive Plan (2024-2026).

Exhibit 10x PERFORMANCE SHARE LONG TERM INCENTIVE AGREEMENT This Agreement is entered into as of February , 2024, between Northwest Natural Holding Company, an Oregon corporation (the “Company”), and (“Recipient”).

February 23, 2024 EX-97

Northwest Natural Holding Company Compensation Recovery Policy, effective as of December 1, 2023.

Exhibit 97 NORTHWEST NATURAL HOLDING COMPANY COMPENSATION RECOVERY POLICY Adopted as of December 1, 2023 Northwest Natural Holding Company, an Oregon corporation, and each of its subsidiaries listed on Exhibit A, collectively (the “Company”), has adopted a Compensation Recovery Policy (this “Policy”) as described below.

February 23, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-38681 Commission file number 1-159

February 23, 2024 EX-99.1

2023 2022 Change In thousands, except per share data Amount Per Share Amount Per Share Amount Per Share Net income: Natural Gas Distribution segment $ 94,042 $ 2.59 $ 79,690 $ 2.34 $ 14,352 $ 0.25 Other (174) — 6,613 0.20 (6,787) (0.20) Consolidated

Exhibit 99.1 For Immediate Release Feb. 23, 2024 NW Natural Holdings Reports Fourth Quarter and Full Year 2023 Results Initiated 2024 earnings guidance and reaffirmed long-term EPS growth rate target of 4-6% PORTLAND, ORE. — Northwest Natural Holding Company, (NYSE: NWN) (NW Natural Holdings), reported financial results and highlights including: •Reported net income of $93.9 million (or $2.59 per

February 23, 2024 EX-21

Subsidiaries of Northwest Natural Holding Company.

EXHIBIT 21 SUBSIDIARIES OF NORTHWEST NATURAL HOLDING COMPANY an Oregon Corporation Name of Subsidiary Jurisdiction Organized Northwest Natural Gas Company (dba NW Natural) Oregon Northwest Energy Corporation(1) Oregon NWN Gas Reserves LLC(1) Oregon NW Natural RNG Holding Company, LLC(1) Oregon Lexington Renewable Energy LLC(1) Delaware Dakota City Renewable Energy LLC(1) Delaware NW Natural Energy

February 23, 2024 EX-23.A

Consent of PricewaterhouseCoopers LLP - NW Holdings.

EXHIBIT 23a CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos.

February 23, 2024 EX-10.BB

Form of Restricted Stock Unit Award Agreement under Long Term Incentive Plan (2024).

Exhibit 10bb RESTRICTED STOCK UNIT AWARD AGREEMENT This Agreement is entered into as of February , 2024, between Northwest Natural Holding Company, an Oregon corporation (the “Company”), and (“Recipient”).

February 23, 2024 EX-4.Q

Note Purchase Agreement dated December 14, 2023, between Northwest Natural Holding Company and the institutional investors named as purchasers therein.

Exhibit 4q Execution Version Northwest Natural Holding Company $100,000,000 5.78% Senior Notes, Series A, due March 7, 2028 $50,000,000 5.84% Senior Notes, Series B, due March 7, 2029 Note Purchase Agreement Dated December 14, 2023 Table of Contents SECTION HEADING PAGE Section 1. Authorization of Notes 1 Section 2. Sale and Purchase of Notes 1 Section 3. Closing 2 Section 4. Conditions to Closing

February 23, 2024 EX-23.B

Consent of PricewaterhouseCoopers LLP - NW Natural.

EXHIBIT 23b CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos.

February 23, 2024 EX-10.M

Executive Annual Incentive Plan, effective February 22, 2024.

Exhibit 10m As amended effective February 22, 2024 NORTHWEST NATURAL GAS COMPANY EXECUTIVE ANNUAL INCENTIVE PLAN This amended Executive Annual Incentive Plan (the “Plan”) is executed by Northwest Natural Gas Company, an Oregon corporation (the “Company”), effective February 22, 2024.

February 23, 2024 EX-10.GG

Form of Amendment of Award Agreements, dated February 22, 2024, entered into by each executive officer.

Exhibit 10gg AMENDMENT OF AWARD AGREEMENTS February 22, 2024 The undersigned is party to one or more Restricted Stock Award Agreements (each, an “RSU Agreement”) and/or Performance Share Long Term Incentive Agreements (each, a “Performance Share Agreement”) with Northwest Natural Holding Company (the “Company”) with unvested awards thereunder (collectively, the “Agreements”).

February 13, 2024 SC 13G/A

TCF Financial Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv01569-northwestnaturalhold.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 6)* Name of issuer: Northwest Natural Holding Co Title of Class of Securities: Common Stock CUSIP Number: 66765N105 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate b

January 19, 2024 SC 13G/A

TCF Financial Corporation / BlackRock Inc. Passive Investment

SC 13G/A 1 us66765n1054011924.txt us66765n1054011924.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 4) NORTHWEST NATURAL HOLDING CO - (Name of Issuer) Common Stock - (Title of Class of Securities) 66765N105 - (CUSIP Number) December 31, 2023 - (Date of Event Which Requires Filing of this Statement) Check the appro

January 11, 2024 8-K

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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 5, 2024 NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its cha

December 29, 2023 8-K

Other Events

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) December 29, 2023 NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its c

December 15, 2023 8-K

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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): December 14, 2023 NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdictio

November 6, 2023 S-8

As filed with the Securities and Exchange Commission on November 6, 2023

As filed with the Securities and Exchange Commission on November 6, 2023 Registration No.

November 6, 2023 EX-FILING FEES

Filing Fee Table

Exhibit 107.1 CALCULATION OF REGISTRATION FEE FORM S-8 (Form Type) REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 NORTHWEST NATURAL HOLDING COMPANY (Exact Name of Registrant as Specified in Its Charter) Table 1: Newly Registered Securities Security Type Security Class Title (1) Fee Calculation Rule Amount Registered (1) Proposed Maximum Offering Price Per Unit (2) Maximum Aggregate Offeri

November 6, 2023 EX-FILING FEES

Filing Fee Table

Exhibit 107.1 CALCULATION OF REGISTRATION FEE FORM S-8 (Form Type) REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 NORTHWEST NATURAL HOLDING COMPANY (Exact Name of Registrant as Specified in Its Charter) Table 1: Newly Registered Securities Security Type Security Class Title (1) Fee Calculation Rule Amount Registered (1) Proposed Maximum Offering Price Per Unit (2) Maximum Aggregate Offeri

November 6, 2023 S-8

As filed with the Securities and Exchange Commission on November 6, 2023

As filed with the Securities and Exchange Commission on November 6, 2023 Registration No.

November 3, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 November 3, 2023 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its ch

November 3, 2023 EX-99.1

Three Months Ended September 30, 2023 2022 Change In thousands, except per share data Amount Per Share Amount Per Share Amount Per Share Net income (loss): Natural Gas Distribution segment $ (24,160) $ (0.66) $ (23,016) $ (0.66) $ (1,144) $ — Other 4

Exhibit 99.1 For Immediate Release November 3, 2023 NW Natural Holdings Reports Third Quarter 2023 Results PORTLAND, ORE. — Northwest Natural Holding Company, (NYSE: NWN) (NW Natural Holdings), reported financial results and highlights including: •Reported a net loss of $23.7 million ($0.65 per share) for the third quarter of 2023, compared to a net loss of $19.6 million ($0.56 per share) for the

November 3, 2023 EX-10.1

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).

EXHIBIT 10.1 AMENDED AND RESTATED INDEMNITY AGREEMENT THIS AGREEMENT is made as of , by and between Northwest Natural Gas Company, an Oregon corporation (the “Company”) and a wholly-owned subsidiary of Northwest Natural Holding Company (“Parent”), and (“Indemnitee”), a director or officer of the Company. RECITALS A. It is essential to the Company to retain and attract as directors and officers the

November 3, 2023 EX-10.2

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).

EXHIBIT 10.2 AMENDED AND RESTATED INDEMNITY AGREEMENT THIS AGREEMENT is made as of , by and between Northwest Natural Holding Company, an Oregon corporation (the “Company”), as successor in interest to Northwest Natural Gas Company, and (“Indemnitee”), a director or officer of the Company. RECITALS A. It is essential to the Company to retain and attract as directors and officers the most capable p

November 3, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURA

October 18, 2023 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K (Mark One) [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 [ ] TRANSITION REPORT PURSUANT

Explanatory Note This Annual Report on Form 11-K for the fiscal year ended December 31, 2022, with respect to the Northwest Natural Gas Company Retirement K Savings Plan was inadvertently filed under the Commission file number for Northwest Natural Holding Company’s subsidiary Northwest Natural Gas Company on June 29, 2023, and is being refiled under the Commission file number for Northwest Natural Holding Company.

August 7, 2023 8-K

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 August 4, 2023 Date of Report (Date of earliest event reported) NORTHWEST NATURAL H

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 August 4, 2023 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its char

August 7, 2023 EX-4.1

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).

Exhibit 4.1 ===================================================================== NORTHWEST NATURAL GAS COMPANY TO DEUTSCHE BANK TRUST COMPANY AMERICAS (FORMERLY KNOWN AS BANKERS TRUST COMPANY), As Corporate Trustee under the Mortgage and Deed of Trust, dated as of July 1, 1946, of Portland Gas & Coke Company (now Northwest Natural Gas Company) TWENTY-SIXTH SUPPLEMENTAL INDENTURE PROVIDING, AMONG

August 3, 2023 EX-99.1

Three Months Ended June 30, 2023 2022 Change In thousands, except per share data Amount Per Share Amount Per Share Amount Per Share Net income (loss): Natural Gas Distribution segment $ (271) $ (0.01) $ 157 $ — $ (428) $ (0.01) Other 1,515 0.04 1,558

Exhibit 99.1 For Immediate Release August 3, 2023 NW Natural Holdings Reports Second Quarter 2023 Results PORTLAND, ORE. — Northwest Natural Holding Company, (NYSE: NWN) (NW Natural Holdings), reported financial results and highlights including: •Reported net income of $1.2 million ($0.03 per share) for the second quarter of 2023, compared to earnings of $1.7 million ($0.05 per share) for the same

August 3, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 August 3, 2023 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its char

August 3, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS

July 28, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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 July 24, 2023 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its chart

June 1, 2023 8-K

Submission of Matters to a Vote of Security Holders

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 May 25, 2023 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction of i

May 26, 2023 EX-99.1

NW Natural Holdings and NW Natural Directors Name Justin B. Palfreyman President and

EXHIBIT 99.1 NW Natural Holdings and NW Natural Directors Name Justin B. Palfreyman President and Approve Senior Management Promotions PORTLAND, OR - (Business Wire) - 05/26/23 - The Boards of Directors of NW Natural Holding Company (NYSE: NWN) (NW Natural Holdings) and NW Natural Gas Company (NW Natural), announced they have approved a number of senior management promotions effective May 25, 2023

May 26, 2023 8-K

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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 May 25, 2023 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its charte

May 4, 2023 8-K

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 May 4, 2023 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLD

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 May 4, 2023 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its charter

May 4, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GA

May 4, 2023 EX-99.1

Three Months Ended March 31, 2023 2022 Change In thousands, except per share data Amount Per Share Amount Per Share Amount Per Share Net income: Natural Gas Distribution segment $ 71,951 $ 2.02 $ 55,390 $ 1.77 $ 16,561 $ 0.25 Other (280) (0.01) 849 0

Exhibit 99.1 For Immediate Release May 4, 2023 NW Natural Holdings Reports First Quarter 2023 Results PORTLAND, ORE. — Northwest Natural Holding Company, (NYSE: NWN) (NW Natural Holdings), reported financial results and highlights including: •Reported net income of $71.7 million ($2.01 per share) for the first three months of 2023, compared to earnings of $56.2 million ($1.80 per share) for the sa

April 13, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropr iate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitt

February 24, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 February 24, 2023 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its c

February 24, 2023 EX-23.A

Consent of PricewaterhouseCoopers LLP - NW Holdings.

EXHIBIT 23a CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos.

February 24, 2023 EX-10.S

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).

Exhibit 10s NORTHWEST NATURAL HOLDING COMPANY LONG TERM INCENTIVE PLAN (as amended as of October 1, 2018 and February 23, 2023) 1.

February 24, 2023 EX-21.1

Subsidiaries of Northwest Natural Holding Company.

EXHIBIT 21 SUBSIDIARIES OF NORTHWEST NATURAL HOLDING COMPANY an Oregon Corporation Name of Subsidiary Jurisdiction Organized Northwest Natural Gas Company (dba NW Natural) Oregon Northwest Energy Corporation(1) Oregon NWN Gas Reserves LLC(1) Oregon NW Natural RNG Holding Company, LLC(1) Oregon Lexington Renewable Energy LLC(1) Delaware Dakota City Renewable Energy LLC(1) Delaware NW Natural Energy

February 24, 2023 EX-10.W

Form of Amendment to Performance Share Long Term Incentive Agreement under Long Term Incentive Plan (2021-2023) and Long Term Incentive Plan (2022-2024)

Exhibit 10w AMENDMENT TO PERFORMANCE SHARE LONG TERM INCENTIVE AGREEMENT The Performance Share Long Term Incentive Agreement between Northwest Natural Holding Company, an Oregon corporation (the “Company”), and (“Recipient”) dated February , 202 (the “Agreement”) is hereby amended by this amendment (the “Amendment”) as follows: 1.

February 24, 2023 EX-4.J

Amended and Restated Credit Agreement, dated as of November 3, 2021, 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, as amended by Amendment No. 1, dated as of January 20, 2023 (incorporated by reference to Exhibit 4j to Form 10-K for 2022, File No. 1-38681).

Exhibit 4j EXHIBIT A CONFORMED THROUGH AMENDMENT NO. 1 DATED JANUARY 20, 2023 EXECUTION VERSION AMENDED AND RESTATED CREDIT AGREEMENT dated as of November 3, 2021 among NORTHWEST NATURAL GAS COMPANY, The Lenders Party Hereto JPMORGAN CHASE BANK, N.A. as Administrative Agent BANK OF AMERICA, N.A., U.S. BANK NATIONAL ASSOCIATION and WELLS FARGO BANK, NATIONAL ASSOCIATION, as Co-Syndication Agents J.

February 24, 2023 EX-10.P

Form of Change in Control Severance Agreement between Northwest Natural Gas Company and each executive officer

Exhibit 10p February 23, 2023 [Name] [Address] [City, State Zip] Re: Amended and Restated Change in Control Severance Agreement Dear [Name]: Northwest Natural Gas Company, an Oregon corporation (the “Company”), a wholly-owned subsidiary of Northwest Natural Holding Company, an Oregon corporation (“Parent”), considers the establishment and maintenance of a sound and vital management to be essential to protecting and enhancing the best interests of the Company.

February 24, 2023 EX-99.1

2022 2021 Change In thousands, except per share data Amount Per Share Amount Per Share Amount Per Share Net income: Natural Gas Distribution segment $ 79,690 $ 2.34 $ 68,988 $ 2.24 $ 10,702 $ 0.10 Other 6,613 0.20 9,678 0.32 (3,065) (0.12) Consolidat

Exhibit 99.1 For Immediate Release Feb. 24, 2023 NW Natural Holdings Reports Fourth Quarter and Full Year 2022 Results Initiated 2023 earnings guidance and reaffirmed long-term EPS growth rate target PORTLAND, ORE. — Northwest Natural Holding Company, (NYSE: NWN) (NW Natural Holdings), reported financial results and highlights including: •Reported net income of $86.3 million (or $2.54 per share) f

February 24, 2023 EX-10.BB

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).

Exhibit 10bb RESTRICTED STOCK UNIT AWARD AGREEMENT This Agreement is entered into as of February , 2023, between Northwest Natural Holding Company, an Oregon corporation (the “Company”), and (“Recipient”).

February 24, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-38681 Commission file number 1-159

February 24, 2023 EX-10.X

Form of Performance Share Long Term Incentive Agreement under Long Term Incentive Plan (2023-2025).

Exhibit 10x PERFORMANCE SHARE LONG TERM INCENTIVE AGREEMENT This Agreement is entered into as of February , 2023, between Northwest Natural Holding Company, an Oregon corporation (the “Company”), and (“Recipient”).

February 24, 2023 EX-10.0

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).

Exhibit 10o February 23, 2023 [Name] [Address] [City, State Zip] Re: Amended and Restated Change in Control Severance Agreement Dear [Name]: Northwest Natural Gas Company, an Oregon corporation (the “Company”), a wholly-owned subsidiary of Northwest Natural Holding Company, an Oregon corporation (“Parent”), considers the establishment and maintenance of a sound and vital management to be essential to protecting and enhancing the best interests of the Company.

February 24, 2023 EX-23.B

Consent of PricewaterhouseCoopers LLP - NW Natural.

EXHIBIT 23b CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (No.

February 24, 2023 EX-4.I

Amended and Restated Credit Agreement, dated as of November 3, 2021, 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, as amended by Amendment No.1, dated as of January 20, 2023 (incorporated by reference to Exhibit 4i to Form 10-K for 2022, File No. 1-15973).

Exhibit 4i EXHIBIT A CONFORMED THROUGH AMENDMENT NO. 1 DATED JANUARY 1, 2023 EXECUTION VERSION AMENDED AND RESTATED CREDIT AGREEMENT dated as of November 3, 2021 among NORTHWEST NATURAL HOLDING COMPANY, The Lenders Party Hereto JPMORGAN CHASE BANK, N.A. as Administrative Agent BANK OF AMERICA, N.A., U.S. BANK NATIONAL ASSOCIATION and WELLS FARGO BANK, NATIONAL ASSOCIATION, as Co-Syndication Agents

February 24, 2023 EX-10.M

Executive Annual Incentive Plan, effective

Exhibit 10m As amended effective February 23, 2023 NORTHWEST NATURAL GAS COMPANY EXECUTIVE ANNUAL INCENTIVE PLAN This amended Executive Annual Incentive Plan (the “Plan”) is executed by Northwest Natural Gas Company, an Oregon corporation (the “Company”), effective February 23, 2023.

February 9, 2023 SC 13G/A

TCF Financial Corporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 5)* Name of issuer: Northwest Natural Holding Co. Title of Class of Securities: Common Stock CUSIP Number: 66765N105 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to designate the rule pursuant to which this Schedule i

January 23, 2023 SC 13G/A

TCF Financial Corporation / BlackRock Inc. Passive Investment

SC 13G/A 1 us66765n1054012323.txt us66765n1054012323.txt SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No: 3) NORTHWEST NATURAL HOLDING CO - (Name of Issuer) Common Stock - (Title of Class of Securities) 66765N105 - (CUSIP Number) December 31, 2022 - (Date of Event Which Requires Filing of this Statement) Check the appro

January 6, 2023 8-K

Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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 January 6, 2023 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its cha

January 6, 2023 EX-4.1

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).

Exhibit 4.1 ===================================================================== NORTHWEST NATURAL GAS COMPANY TO DEUTSCHE BANK TRUST COMPANY AMERICAS (FORMERLY KNOWN AS BANKERS TRUST COMPANY), As Corporate Trustee under the Mortgage and Deed of Trust, dated as of July 1, 1946, of Portland Gas & Coke Company (now Northwest Natural Gas Company) TWENTY-FIFTH SUPPLEMENTAL INDENTURE PROVIDING, AMONG

December 14, 2022 8-K

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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 December 13, 2022 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its c

November 8, 2022 EX-99.1

Three Months Ended September 30, 2022 2021 Change In thousands, except per share data Amount Per Share Amount Per Share Amount Per Share Net income (loss): Natural Gas Distribution segment $ (23,016) $ (0.66) $ (23,297) $ (0.76) $ 281 $ 0.10 Other 3,

Exhibit 99.1 For Immediate Release Nov. 8, 2022 NW Natural Holdings Reports Third Quarter 2022 Results PORTLAND, ORE. ? Northwest Natural Holding Company, (NYSE: NWN) (NW Natural Holdings), reported financial results and highlights including: ?Reported a net loss of $19.6 million ($0.56 per share) for the third quarter of 2022, compared to a net loss of $20.7 million ($0.67 per share) for the same

November 8, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURA

November 8, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 November 8, 2022 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its ch

October 27, 2022 8-K

Other Events

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 October 24, 2022 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its ch

October 6, 2022 EX-99.1

###

EXHIBIT 99.1 For Immediate Release October 5, 2022 NW Natural Water Closes Acquisition of Far West?s Water and Wastewater Utilities PORTLAND, Ore., Oct. 5, 2022 ? NW Natural Water Company, LLC (NW Natural Water), a wholly-owned subsidiary of Northwest Natural Holding Company (NYSE:NWN) (NW Natural Holdings), has completed the acquisition of the water and wastewater utilities of Far West Water & Se

October 6, 2022 8-K

Regulation FD Disclosure, Financial Statements and Exhibits, Other Events

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 October 5, 2022 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction o

September 30, 2022 EX-4.1

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).

EXHIBIT 4.1 ===================================================================== NORTHWEST NATURAL GAS COMPANY TO DEUTSCHE BANK TRUST COMPANY AMERICAS (FORMERLY KNOWN AS BANKERS TRUST COMPANY), As Corporate Trustee under the Mortgage and Deed of Trust, dated as of July 1, 1946, of Portland Gas & Coke Company (now Northwest Natural Gas Company) TWENTY-FOURTH SUPPLEMENTAL INDENTURE PROVIDING, AMONG

September 30, 2022 8-K

Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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 September 30, 2022 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its

September 21, 2022 EX-4.2

Credit Agreement, dated as of September 15, 2022, among NW Natural Water Company, LLC, Northwest Natural Holding Company and the lenders party thereto, with U.S. Bank National Association as administrative agent (incorporated by reference to Exhibit 4.2 to the Form 8-K filed September 21, 2022, file No. 1-38681).

EXHIBIT 4.2 EXECUTION VERSION Deal CUSIP 62974LAA3 Facility CUSIP 62974LAB1 CREDIT AGREEMENT dated as of September 15, 2022 among NW NATURAL WATER COMPANY, LLC, as Borrower NORTHWEST NATURAL HOLDING COMPANY, as Guarantor The Lenders Party Hereto U.S. BANK NATIONAL ASSOCIATION, as Administrative Agent U.S. BANK NATIONAL ASSOCIATION, as Bookrunner and Lead Arranger TABLE OF CONTENTS Page ARTICLE I D

September 21, 2022 8-K

Financial Statements and Exhibits, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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 September 15, 2022 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdictio

September 21, 2022 EX-4.1

Credit Agreement, dated as of September 15, 2022, among Northwest Natural Holding Company and the lenders party thereto, with U.S. Bank National Association as administrative agent (incorporated by reference to Exhibit 4.1 to the Form 8-K filed September 21, 2022, file No. 1-38681).

EXHIBIT 4.1 EXECUTION VERSION Deal CUSIP 66765PAC4 Facility CUSIP 66765PAD2 CREDIT AGREEMENT dated as of September 15, 2022 among NORTHWEST NATURAL HOLDING COMPANY, as Borrower The Lenders Party Hereto U.S. BANK NATIONAL ASSOCIATION, as Administrative Agent U.S. BANK NATIONAL ASSOCIATION, as Bookrunner and Lead Arranger TABLE OF CONTENTS Page ARTICLE I Definitions 1 SECTION 1.01 Defined Terms 1 SE

August 4, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 August 4, 2022 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its char

August 4, 2022 S-8

As filed with the Securities and Exchange Commission on August 4, 2022

As filed with the Securities and Exchange Commission on August 4, 2022 Registration No.

August 4, 2022 EX-3.1

Amended and Restated Bylaws of Northwest Natural Holding Company (incorporated by reference to Exhibit 3.1 to the Form 10-Q for the quarter ended June 30, 2022, File No. 1-38681).

EXHIBIT 3.1 AMENDED AND RESTATED BYLAWS OF NORTHWEST NATURAL HOLDING COMPANY ARTICLE I. OFFICES Section 1. Office. The principal office of the company shall be located in the City of Portland, Oregon. The company also may have offices at such other places both within and without the State of Oregon as the board of directors from time to time may determine. Section 2. Registered Office. The registe

August 4, 2022 EX-3.2

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, 2022, File No. 1-38681).

EXHIBIT 3.2 AMENDED AND RESTATED BYLAWS OF NORTHWEST NATURAL GAS COMPANY ARTICLE I. OFFICES Section 1. Office. The principal office of the company shall be located in the City of Portland, Oregon. The company also may have offices at such other places both within and without the State of Oregon as the board of directors from time to time may determine. Section 2. Registered Office. The registered

August 4, 2022 EX-99.1

Three Months Ended June 30, 2022 2021 Change In thousands, except per share data Amount Per Share Amount Per Share Amount Per Share Net income (loss): Natural Gas Distribution segment $ 157 $ — $ (1,381) $ (0.05) $ 1,538 $ 0.05 Other 1,558 0.05 657 0

Exhibit 99.1 For Immediate Release August 4, 2022 NW Natural Holdings Reports Second Quarter 2022 Results PORTLAND, ORE. ? Northwest Natural Holding Company, (NYSE: NWN) (NW Natural Holdings), reported financial results and highlights including: ?Reported net income of $1.7 million ($0.05 per share) for the second quarter of 2022, compared to a net loss of $0.7 million ($0.02 per share) for the sa

August 4, 2022 EX-FILING FEES

Filing Fee Table

Exhibit 107 Calculation of Filing Fee Tables Form S-8 (Form Type) Northwest Natural Holding Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered(1) Proposed Maximum Offering Price Per Unit(2) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Equity Common Stock(3) 457(a) 200,000 $53.

August 4, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS

July 15, 2022 8-K

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

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 July 15, 2022 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its chart

June 24, 2022 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K (Mark One) [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 [ ] TRANSITION REPORT PURSUANT

11-K 1 form11-k2021.htm 11-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K (Mark One) [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file numbe

June 1, 2022 8-K

Other Events

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 May 31, 2022 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its charte

May 26, 2022 8-K

Submission of Matters to a Vote of Security Holders

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 May 23, 2022 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction of i

May 4, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GA

May 4, 2022 EX-99.1

Three Months Ended March 31, 2022 2021 Change In thousands, except per share data Amount Per Share Amount Per Share Amount Per Share Net income: Natural Gas Distribution segment $ 55,390 $ 1.77 $ 53,925 $ 1.76 $ 1,465 $ 0.01 Other 849 0.03 5,592 0.18

Exhibit 99.1 For Immediate Release May 4, 2022 NW Natural Holdings Reports First Quarter 2022 Results PORTLAND, ORE. ? Northwest Natural Holding Company, (NYSE: NWN) (NW Natural Holdings), reported financial results and highlights including: ?Earned net income of $1.80 per share for the first quarter of 2022, compared to net income of $1.94 per share for the same period in 2021. The first quarter

May 4, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 May 4, 2022 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its charter

April 14, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

DEF 14A 1 d233943ddef14a.htm DEF 14A Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Us

April 1, 2022 8-K

Financial Statements and Exhibits, Other Events

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 April 1, 2022 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY (Exact name of registrant as specified in its charter) Commission file number 1-38681 Oregon 82-4710680 (State or other jurisdiction of

April 1, 2022 EX-5.(A)

The consent of MardiLyn Saathoff, Esquire is included in her opinion filed as Exhibit 5(a).

Exhibit 5(a) April 1, 2022 Northwest Natural Holding Company 250 S.W. Taylor Street Portland, Oregon 97204 Ladies and Gentlemen: With respect to the Registration Statement No. 333-258792 (the ?Registration Statement?) filed with the Securities and Exchange Commission (the ?Commission?) on August 13, 2021 by Northwest Natural Holding Company (the ?Company?), I have reviewed such documents and recor

April 1, 2022 EX-5.(B)

The consent of Morgan, Lewis & Bockius LLP is included in its opinion filed as Exhibit 5(b).

Exhibit 5(b) April 1, 2022 Northwest Natural Holding Company 250 S.W. Taylor Street Portland, Oregon 97204 Ladies and Gentlemen: With respect to the Registration Statement No. 333-258792 (the ?Registration Statement?) filed with the Securities and Exchange Commission (the ?Commission?) on August 13, 2021 by Northwest Natural Holding Company (the ?Company?), we have reviewed such documents and reco

April 1, 2022 EX-1.1

Underwriting Agreement, dated March 29, 2022, by and between NW Holdings and Wells Fargo Securities, LLC, J.P. Morgan Securities LLC and RBC Capital Markets, LLC, as representatives of the several underwriters named therein.

EX-1.1 2 exhibit11.htm EX-1.1 Exhibit 1.1 Execution Version NORTHWEST NATURAL HOLDING COMPANY 2,500,000 Shares of Common Stock UNDERWRITING AGREEMENT Dated: March 29, 2022 TABLE OF CONTENTS Page SECTION 1. Representations and Warranties 2 SECTION 2. Sale and Delivery to Underwriters; Closing 16 SECTION 3. Covenants of the Company 17 SECTION 4. Payment of Expenses 21 SECTION 5. Conditions of Underw

March 30, 2022 EX-FILING FEES

Calculation of Filing Fee Table (Form Type) Northwest Natural Holding Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount

Exhibit 107 EX-FILING FEES Calculation of Filing Fee Table 424(b)(2) (Form Type) Northwest Natural Holding Company (Exact Name of Registrant as Specified in its Charter) Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee Newly Registered Securities Fees to Be Paid Equity Common Stock, no par value Rule 457(r) 2,875,000(1) $50.

March 30, 2022 424B2

2,500,000 Shares NORTHWEST NATURAL HOLDING COMPANY Common Stock

Table of Contents Filed pursuant to Rule 424(b)(2) Registration No. 333-258792 PROSPECTUS SUPPLEMENT (to Prospectus Dated August 13, 2021) 2,500,000 Shares NORTHWEST NATURAL HOLDING COMPANY Common Stock Northwest Natural Holding Company (NW Holdings) is offering 2,500,000 shares of its common stock. Our common stock is listed and trades on the New York Stock Exchange, or the ?NYSE,? under the symb

March 29, 2022 424B5

SUBJECT TO COMPLETION, DATED MARCH 29, 2022

424B5 1 d337747d424b5.htm 424B5 Table of Contents Filed pursuant to Rule 424(b)(5) Registration No. 333-258792 This preliminary prospectus supplement and the accompanying prospectus relate to an effective registration statement under the Securities Act of 1933, as amended, but are not complete and may be changed. SUBJECT TO COMPLETION, DATED MARCH 29, 2022 PRELIMINARY PROSPECTUS SUPPLEMENT (to Pro

February 25, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-38681 Commission file number 1-159

February 25, 2022 EX-3.D

Amended and Restated Bylaws of Northwest Natural Gas Company.

Exhibit 3d AMENDED AND RESTATED BYLAWS OF NORTHWEST NATURAL GAS COMPANY ARTICLE I.

February 25, 2022 EX-3.C

Amended and Restated Bylaws of Northwest Natural Holding Company.

Exhibit 3c AMENDED AND RESTATED BYLAWS OF NORTHWEST NATURAL HOLDING COMPANY ARTICLE I.

February 25, 2022 EX-10.LL

Annual Incentive Plan for NW Natural Gas Storage, LLC, as amended effective January 1, 2022

Exhibit 10II ANNUAL INCENTIVE PLAN NW Natural Gas Storage LLC (?company?, or ?the company?) PURPOSE The purpose of the Annual Incentive Plan (AIP) is to recognize and reward Non-Bargaining Unit (NBU) employees who have performed well and contributed to successful company performance as measured by key performance indicators.

February 25, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

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 February 25, 2022 Date of Report (Date of earliest event reported) NORTHWEST NATURAL HOLDING COMPANY NORTHWEST NATURAL GAS COMPANY (Exact name of registrant as specified in its charter) (Exact name of registrant as specified in its c

February 25, 2022 EX-23.A

Consent of PricewaterhouseCoopers LLP - NW Holdings.

EXHIBIT 23a CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos.

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