X0306 4 2018-01-11 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001192754 GIBSON C SCOTT 220 NW SECOND AVENUE PORTLAND OR 97209 1 0 0 0 Common Stock 2018-01-11 4 J 0 1416 0 D 15031.016 I See Footnote Common Stock 2018-01-11 4 J 0 1416 0 A 1744 D Common Stock 2018-01-11 4 J 0 277 0 D 2215.969 I See Footnote Common Stock 2018-01-11 4 J 0 277 0 A 2021 D Shares were distributed from Deferred Compensation Plan for Directors and Executives (DCP) account to reporting person's brokerage account pursuant to reporting person's election on May 7, 2008 with regard to his election to participate in the DCP. Reflects shares that have been credited to reporting person's account under the issuer's DCP. 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. Shares were distributed from Directors Deferred Compensation Plan (DDCP) account to reporting person's brokerage account pursuant to reporting person's election on May 7, 2008 with regard to his election to participate in the DDCP. Shares have been credited to reporting person's account under the issuer's Directors Deferred Compensation Plan. Shawn M. Filippi, Attorney-in-Fact 2018-01-16