X0306 4 2016-03-02 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001571275 WILSON BRODY J 220 NW SECOND AVENUE PORTLAND OR 97209 0 1 0 0 CAO, Controller & Asst. Treas. Common Stock 2016-03-02 4 F 0 278 49.44 D 1204 D Common Stock 143.9995 I See Footnote Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of restricted stock units (RSUs). Organization and Executive Compensation Committee certification of satisfaction of the performance threshold and vesting for 575 RSUs was reported on Form 4 filed on February 26, 2016, and 183 RSUs without performance threshold had been previously reported on Form 3/A filed on November 24, 2014. Shares held in the reporting person's account under issuer's Retirement K Savings Plan as of February 29, 2016. Shawn M. Filippi, Attorney-in-Fact 2016-03-04