X0508 4 2023-11-06 0001733998 Northwest Natural Holding Co NWN 0001069010 MCCURDY DAVID K 250 SW TAYLOR STREET PORTLAND OR 97204 true false Common Stock 2023-11-06 4 I 0 355.041 37.75 A 3770.174 I See Footnote Common Stock 376 D The reporting transaction was effected pursuant to a written election under the NW Natural Deferred Compensation Plan made on or about September 14, 2020. At the time made, the election was intended to satisfy the then-current Rule 10b5-1. The election has not been entered into, modified or terminated since the original election date. Shares have been credited to reporting person's account under the NW Natural Deferred Compensation Plan. Shawn M. Filippi, Attorney in Fact 2023-11-08