X0306 4 2016-05-26 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001615914 Wasson Malia H 220 NW SECOND AVENUE PORTLAND OR 97209 1 0 0 0 Common Stock 2016-05-26 4 A 0 365 0 A 3513.645 I See Footnote Common stock pursuant to 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. 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 2016-05-31