X0306 4 2017-02-28 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001192754 GIBSON C SCOTT 220 NW SECOND AVENUE PORTLAND OR 97209 1 0 0 0 Common Stock 2017-02-28 4 S 0 1643 59.8567 D 0 D Common Stock 16090.867 I See Footnote Common Stock 2438.554 I See Footnote This transaction was executed in multiple trades on reported date with prices ranging from $59.855 - $59.875, resulting in an average price of $59.8567. Northwest Natural Gas Company ("Issuer") will provide upon request by the Commission staff or a security holder of the Issuer full information regarding the number of shares purchased or sold at each separate price. Includes 365 restricted stock units (RSUs) granted in accordance with the Northwest Natural Gas Company Compensation Policy for Non-employee Directors. These RSUs vest on May 24, 2017. Director previously elected that shares received on vesting of RSUs will be deferred under the issuer's Deferred Compensation Plan for Directors and Executives. Reflects shares that have been credited to reporting person's account under the issuer's Deferred Compensation Plan for Directors and Executives. Shares have been credited to reporting person's account under the issuer's Directors Deferred Compensation Plan. Shawn M. Filippi, Attorney-in-Fact 2017-03-01