Stock Trading History of Nelson Mark W

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 Nelson Mark W since year 2005. The trader's CIK number is 1202458. At the time of this reporting, Nelson Mark W is the Executive Vice President of Columbia Banking System Inc . (stock ticker symbol COLB). See this page for all insider trading activities at Columbia Banking System Inc .

Stock purchases, sales, and option exercises reported by insider *Nelson Mark W* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2008-03-03	COLB	Columbia Banking System Inc	Option Exercise	10,500	10.68	112,140
2008-03-03	COLB	Columbia Banking System Inc	Sale	1,772	23.54	41,714
2007-01-03	COLB	Columbia Banking System Inc	Purchase	95	31.61	3,002
2006-06-30	COLB	Columbia Banking System Inc	Purchase	114	26.40	3,009
2005-06-30	COLB	Columbia Banking System Inc	Purchase	136	22.16	3,013
2006-01-03	COLB	Columbia Banking System Inc	Purchase	136	21.92	2,981
2005-06-30	COLB	Columbia Banking System Inc	Purchase	136	22.16	3,013
2005-06-30	COLB	Columbia Banking System Inc	Purchase	136	22.16	3,013
2006-01-03	COLB	Columbia Banking System Inc	Purchase	136	21.92	2,981
2004-12-31	COLB	Columbia Banking System Inc	Purchase	136	22.16	3,013
2004-12-31	COLB	Columbia Banking System Inc	Purchase	136	22.16	3,013

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 Nelson Mark W (Executive Vice President of Columbia Banking System Inc at the time of this reporting) see the Securities and Exchange Commission (SEC) website.