X0306 4 2015-03-04 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001383905 Williams David R 220 NW SECOND AVE PORTLAND OR 97209 0 1 0 0 VP Common Stock 2015-03-04 4 F 0 142 46.57 D 4065.0744 D Common Stock 2253.2564 I See Footnote Common Stock 2815.468 I See Footnote Shares were withheld by the issuer to cover withholding taxes on issuance of performance shares. Organization and Executive Compensation Committee certification of the payout of these performance shares was reported on Form 4 filed on February 27, 2015. Shares held in reporting person's account under issuer's Retirement K Savings Plan as of February 28, 2015. Shares have been credited to reporting person's account under the issuer's Deferred Compensation Plan for Directors and Executives. Shawn M. Filippi, Attorney-in-Fact 2015-03-06