X0306 4 2013-03-06 0 0000073020 NORTHWEST NATURAL GAS CO NWN 0001383981 Yoshihara Grant M 220 NW SECOND AVENUE PORTLAND OR 97209 0 1 0 0 VP Common Stock 2013-03-06 4 F 0 188 44.01 D 8753 D Common Stock 2013-03-06 4 F 0 89 44.01 D 8664 D Common Stock 1917.6212 I See Footnote Employee Stock Option to Buy 31.34 2014-03-04 Common Stock 3000 3000 D Employee Stock Option to Buy 34.29 2016-02-29 Common Stock 2500 2500 D Employee Stock Option to Buy 44.48 2017-02-28 Common Stock 2000 2000 D Employee Stock Option to Buy 43.29 2018-03-06 Common Stock 2000 2000 D Employee Stock Option to Buy 41.15 2019-03-04 Common Stock 2000 2000 D Employee Stock Option to Buy 44.25 2020-03-02 Common Stock 2000 2000 D Employee Stock Option to Buy 45.74 2021-03-02 Common Stock 3500 3500 D 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 on 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 held in reporting person's account under Northwest Natural Gas Company's Retirement K Savings Plan as of February 28, 2013. Option was granted for 3,000 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 2,500 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 2,000 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 2,000 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 2,000 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 2,000 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan"). The option vests in installments of 500 shares on each February 24, 2011 and January 1, 2012, 2013 and 2014. Option was granted for 3,500 shares pursuant to Northwest Natural Gas Company's Restated Stock Option Plan (the "Plan"). The option vests in installments of 875 shares on each February 23, 2012 and January 1, 2013, 2014 and 2015. Shawn M. Filippi, Attorney-in-Fact 2013-03-07