X0306 4 2016-03-16 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001192779 KANTOR GREGG S 220 NW SECOND AVE PORTLAND OR 97209 1 1 0 0 CEO Common Stock 2016-03-16 4 M 0 7000 44.48 A 52996.8224 D Common Stock 2016-03-16 4 S 0 7000 50.4669 D 45996.8224 D Common Stock 7547.045 I See Footnote Common Stock 200 I See Footnote Common Stock 570 I See Footnote Employee Stock Option to Buy 44.48 2016-03-16 4 M 0 7000 0 D 2017-02-28 Common Stock 7000 0 D This transaction reflects the sale of stock acquired on exercise of a stock option. This transaction was executed in multiple trades on reported date with prices ranging from $50.32 to $50.60, resulting in an average price of $50.4669. 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 have been credited to reporting person's account under the issuer's Deferred Compensation Plan for Directors and Executives. Shares held in reporting person's parent's account, with respect to which the reporting person is Power of Attorney and a potential beneficiary. Shares held in reporting person's parent's IRA account, with respect to which the reporting person is Power of Attorney and a potential beneficiary. The option vested in four equal installments on February 21, 2008, and January 1, 2009, 2010, and 2011. Option was granted as part of compensation for services. The option was exercised in a cashless exercise. Shawn M. Filippi, Attorney-in-Fact 2016-03-17