X0306 4 2015-11-09 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001538965 Weber David A. 220 NW SECOND AVENUE PORTLAND OR 97209 0 1 0 0 Pres. & CEO of Issuer's Sub. Common Stock 2015-11-09 4 M 0 625 34.29 A 773.042 D Common Stock 2015-11-09 4 S 0 625 45.9098 D 148.042 D Common Stock 8435.9741 I See Footnote Common Stock 1447.166 I See Footnote Employee Stock Option to Buy 34.29 2015-11-09 4 M 0 625 0 A 2016-02-29 Common Stock 625 0 D The sale of Northwest Natural Gas Company stock occurred in 4 separate broker transactions on November 9, 2015. The sale prices of these shares ranged from $45.90 to $45.925, resulting in a weighted average price of $45.9098. Northwest Natural Gas Company 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. Shares held in reporting person's account under issuer's Retirement K Savings Plan as of October 31, 2015. Shares have been credited to reporting person's account under the issuer's Deferred Compensation Plan for Directors and Executives. The option vested in four equal installments on 2/22/2007, and January 1st in 2008, 2009 and 2010. Shawn M. Filippi, Attorney-in-Fact 2015-11-10