X0306 4 2016-05-26 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001192773 DODSON MARK S 220 NW SECOND AVENUE PORTLAND OR 97209 1 0 0 0 Common Stock 2016-05-26 4 A 0 365 0 A 523 D Common Stock 8220 I By Trust Common Stock 7604.883 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. These shares are held in a trust for the benefit of the reporting person's spouse. The filing of this report is not an admission that the reporting person is the beneficial owner of these securities for purposes of Section 16 or for any other purpose. Reflects shares that 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