NW Natural Holdings Schedules Earnings Release and Conference Call for Friday, Feb. 27

PORTLAND, Ore.–(BUSINESS WIRE)–Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings) announced today it will issue its fourth quarter and full year 2025 earnings release and conduct an analyst conference call and webcast to review results at 8 a.m. Pacific Time (11 a.m. Eastern Time) on Friday, Feb. 27, 2026.

To hear the conference by webcast, log on to NW Natural Holdings’ corporate website at ir.nwnaturalholdings.com. To hear the conference call by phone, please dial 1-833-470-1428 within the United States and enter the conference access code 245591.

To access the conference replay, please call 1-866-813-9403 within the United States and enter the conference identification access code 398089.

About NW Natural Holdings

Northwest Natural Holding Company (NYSE: NWN) (NW Natural Holdings) is headquartered in Portland, Oregon and has been doing business for over 167 years. It owns Northwest Natural Gas Company (NW Natural), SiEnergy Operating (SiEnergy Gas Utility), NW Natural Water Company (NWN Water Utility), NW Natural Renewables Holdings (NWN Renewables), and other business interests.

NW Natural Holdings through its subsidiaries provides critical energy and delivers essential water and wastewater services to over one million meters across seven states. We have a longstanding commitment to safety, environmental stewardship, and taking care of our employees and communities. NW Natural Holdings was recognized by Ethisphere® for four years running as one of the World’s Most Ethical Companies®. NW Natural consistently leads the industry with high J.D. Power & Associates customer satisfaction scores.

NWN Gas Utility is a local distribution company that currently provides natural gas service to approximately 2 million people in more than 140 communities through approximately 806,000 meters in Oregon and Southwest Washington with one of the most modern pipeline systems in the nation. NW Natural owns and operates 21.6 Bcf of underground gas storage capacity in Oregon.

SiEnergy Gas Utility is one of the fastest growing natural gas distribution utilities in the nation, serving approximately 87,000 meters in the greater metropolitan areas of Houston, Dallas, and Austin, Texas.

NWN Water Utility provides water distribution and wastewater services to communities throughout the Pacific Northwest, Texas, Arizona, and California. Today NW Natural Water serves an estimated 197,000 people through approximately 79,000 meters and provides operation and maintenance services to an additional 38,000 connections. Learn more about our water business at nwnaturalwater.com.

NWN Renewables is committed to leading in the energy transition by providing renewable fuels. Learn more at nwnaturalrenewables.com.

Additional information is available at nwnaturalholdings.com.

“World’s Most Ethical Companies” and “Ethisphere” names and marks are registered trademarks of Ethisphere LLC

Contacts

Investor Contact:

Nikki Sparley

Phone: 503-721-2530

Email: nikki.sparley@nwnatural.com

Media Contact:

David Roy

Phone: 503-610-7157

Email: david.roy@nwnatural.com