X0306 4 2016-01-14 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 2015-12-11 5 G 0 103 0 D 40109.7893 D Common Stock 2015-12-11 5 G 0 62 0 D 40047.7893 D Common Stock 2016-01-14 4 J 0 445 0 D 5362.421 I See Footnote Common Stock 2016-01-14 4 J 0 445 0 A 40492.7893 D Common Stock 2016-01-14 4 S 0 233 50.4725 D 5129.421 I See Footnote Common Stock 4093.2831 I See Footnote Common Stock 200 I See Footnote Common Stock 570 I See Footnote Shares were distributed from Deferred Compensation Plan for Directors and Executives (DCP) account to reporting person's registered account pursuant to reporting person's election on December 5, 2008 (for shares acquired in 2008) and on December 8, 2008 (for shares acquired in 2009) 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. These shares were issued in connection with the reporting person's election on December 5, 2008 (for shares acquired in 2008) and on December 8, 2008 (for shares acquired in 2009) to participate in the issuer's DCP, which specifies that taxes shall be withheld from distribution. Pursuant to the DCP and the reporting person's elections on the dates stated hereinabove, these shares were sold to pay taxes on the DCP distribution made on January 14, 2016. Held in reporting person's account under issuer's Retirement K Savings Plan as of December 31, 2015. Shares held in reporting person's parent's account, with respect to which the reporting person is Power of Attorney and a potential beneficiary. Held in reporting person's parent's IRA account, with respect to which the reporting person is Power of Attorney and a potential beneficiary. Shawn M. Filippi, Attorney-in-Fact 2016-01-19