X0303 4 2009-12-02 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 2009-12-02 4 M 0 2500 20.25 A 8475 D Common Stock 2009-12-02 4 S 0 2500 43.6385 D 5975 D Common Stock 1503.5425 I See Footnote Employee Stock Option to Buy 20.25 2009-12-02 4 M 0 2500 0 D 2010-03-02 Common Stock 2500 0 D Employee Stock Option to Buy 26.3 2012-03-05 Common Stock 2500 2500 D 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 The sale of Northwest Natural Gas Company stock took place in 2 seperate broker transactions occurring on 12/02/2009. The price in column 4 represents the weighted average sale price for the transactions reported on this line. The range of prices for these transactions was $43.58 -$43.69688. Northwest Natural Gas Company will provide upon request by the Commission staff or a security holder of Northwest Natural Gas Company full information regarding the number of shares purchased or sold at each separate price. Shares held in reporting person's account under Northwest Natural Gas Company's Retirement K Savings Plan as of November 30, 2009. 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, 2003. 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, 2005. 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 vests in installments of 625 shares on each February 22, 2007 and January 1, 2008, 2009 and 2010. 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 21, 2008 and January 1, 2009, 2010 and 2011. 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 27, 2009 and January 1, 2010, 2011 and 2012. 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 25, 2010 and January 1, 2011, 2012 and 2013. MardiLyn Saathoff, Attorney-in-Fact 2009-12-03