X0306 4 2013-05-03 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 2013-05-03 4 I 0 366.766 43.91 A 649.877 I See Footnote Common Stock 2013-03-12 5 G 0 1050 0.00 D 42527.8273 D Common Stock 671.2050 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 have been credited to reporting person's account under the issuer's Retirement K Savings Plan as of May 3, 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 2013-05-07