X0306 4 2013-03-04 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001241405 ANDERSON DAVID HUGO 220 NW SECOND AVENUE PORTLAND OR 97209 0 1 0 0 Executive VP Common Stock 2013-03-04 4 I 0 283.112 43.74 A 283.112 I See Footnote Common Stock 2013-03-06 4 F 0 428 44.01 D 43758.8273 D Common Stock 2013-03-06 4 F 0 181 44.01 D 43577.8273 D Common Stock 627.2731 I See Footnote Employee Stock Option to Buy 32.02 2014-09-27 Common Stock 16000 16000 D Employee Stock Option to Buy 34.29 2016-02-29 Common Stock 8000 8000 D Employee Stock Option to Buy 44.48 2017-02-28 Common Stock 7000 7000 D Employee Stock Option to Buy 43.29 2018-03-06 Common Stock 8000 8000 D Employee Stock Option to Buy 41.15 2019-03-04 Common Stock 8000 8000 D Employee Stock Option to Buy 44.25 2020-03-02 Common Stock 8000 8000 D Employee Stock Option to Buy 45.74 2021-03-02 Common Stock 11000 11000 D Shares have been credited to reporting person's account under the issuer's Deferred Compensation Plan for Directors and Executives. Shares were withheld by the issuer to cover withholding taxes on issuance of performance shares. Organization and Executive Compensation Committee certification of the payout of these performance shares was reported on Form 4 filed March 1, 2013. Shares were withheld by the issuer to cover withholding taxes on issuance of shares due to vesting of restricted stock units. Organization and Executive Compensation Committee certification of the satisfaction of the performance threshold and vesting for these restricted stock units was reported on Form 4 filed on March 1, 2013. Shares have been credited to reporting person's account under the issuer's Retirement K Savings Plan as of February 28, 2013. Option was granted for 16,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan"). The option fully vested on January 1, 2007. Option was granted for 8,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan"). The option fully vested on January 1, 2010. Option was granted for 7,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan"). The option fully vested on January 1, 2011. Option was granted for 8,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan"). The option fully vested on January 1, 2012. Option was granted for 8,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan"). The option fully vested on January 1, 2013. Option was granted for 8,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan"). The option vests in installments of 2,000 shares on each February 24, 2011 and January 1, 2012, 2013 and 2014. Option was granted for 11,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan"). The option vests in installments of 2,750 shares on each February 23, 2012 and January 1, 2013, 2014 and 2015. Shawn M. Filippi, Attorney-in-Fact 2013-03-06