X0306 4 2018-02-26 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001407314 Peverett Jane L 220 NW SECOND AVENUE PORTLAND OR 97209 1 0 0 0 Common Stock 2018-02-26 4 I 0 28.122 53.70 A 19958.273 I See Footnote Common Stock 2018-02-27 4 S 0 1000 53.375 D 523 D Includes 328 restricted stock units (RSUs) granted in accordance with the Northwest Natural Gas Company Compensation Policy for Non-employee Directors. These RSUs vest on May 23, 2018. Director previously elected that shares received on vesting of RSUs will be deferred under the issuer's Deferred Compensation Plan for Directors and Executives. Shares have been credited to reporting person's account under the issuer's Deferred Compensation Plan for Directors and Executives pursuant to an election made on August 21, 2007. This transaction was executed in multiple trades on reported date with prices ranging from $53.305 - $53.405, resulting in an average price of $53.375. 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. Shawn M. Filippi, Attorney-in-Fact 2018-02-28