144 0001241405 XXXXXXXX LIVE 0001733998 Northwest Natural Holding Co 001-38681 250 SW TAYLOR STREET PORTLAND OR 97204 503-226-4211 ANDERSON DAVID HUGO Officer Director COMMON THE CHARLES SCHWAB CORPORATION

3000 Schwab Way Westlake TX 76262

50091 2001935.00 40238495 03/24/2025 NYSE COMMON 08/15/2005 VAROUS METHODS & DATES ISSUER N 50091 08/15/2005 NA N DAVID H ANDERSON

250 S.W. Taylor Street Portland OR 97204

COMMON 01/21/2025 7500 309967.00 DAVID H ANDERSON

250 S.W. Taylor Street Portland OR 97204

COMMON 02/20/2025 7500 307283.00 DAVID H ANDERSON

250 S.W. Taylor Street Portland OR 97204

COMMON 02/24/2025 509 21379.00 DAVID H ANDERSON

250 S.W. Taylor Street Portland OR 97204

COMMON 02/25/2025 1451 60942.00 DAVID H ANDERSON

250 S.W. Taylor Street Portland OR 97204

COMMON 02/26/2025 2588 108696.00 DAVID H ANDERSON

250 S.W. Taylor Street Portland OR 97204

COMMON 03/03/2025 15452 649061.00 FULL ACCOUNT TITLE: DAVID ANDERSON TR & SUSAN SANDS ANDERSON TR HELD AS TIC, D ANDERSON & S ANDERSON TTEE. Shares acquired various methods and dates. 03/24/2025 09/16/2024 DAVID H ANDERSON