X0306 4 2017-03-01 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001671699 Russell Lori L 220 SECOND AVENUE PORTLAND OR 97209 0 1 0 0 VP, Utility Services Common Stock 2017-03-01 4 F 0 96 60.10 D 1489.4341 D Common Stock 394.669 I See Footnote Common Stock 3480.6959 I See Footnote Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of restricted stock units. Organization and Executive Compensation Committee certification of satisfaction of the performance threshold and vesting for these restricted stock units was reported on Form 4 filed on February 24, 2017. Shares have been credited to the reporting person's account under issuer's Deferred Compensation Plan for Directors and Executives. Shares held in reporting person's account under issuer's Retirement K Savings Plan as of February 28, 2017. Shawn M. Filippi, Attorney-in-Fact 2017-03-03