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Stock Trading History of Yoshihara Grant M

The following table details the trading activities (stock purchases, stock sales, and stock option exercises) reported to the Securities and Exchange Commission (SEC) by insider Yoshihara Grant M since year 2005. The trader's CIK number is 1383981. At the time of this reporting, Yoshihara Grant M is the Vice President of Northwest Natural Gas Co (stock ticker symbol NWN).

Stock purchases, sales, and option exercises reported by *Yoshihara Grant M* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2007-11-21	NWN	Northwest Natural Gas Co	Sale	1,000	50.00	50,000
2007-11-21	NWN	Northwest Natural Gas Co	Option Exercise	1,000	27.88	27,875

Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Yoshihara Grant M (Vice President of Northwest Natural Gas Co at the time of this reporting) see the Securities and Exchange Commission (SEC) website.