Stock Trading History of Potter Stephen N

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 Potter Stephen N since year 2005. The trader's CIK number is 1378549. At the time of this reporting, Potter Stephen N is the EVP/President NTGI of Northern Trust Corp . (stock ticker symbol NTRS). See this page for all insider trading activities at Northern Trust Corp .

Stock purchases, sales, and option exercises reported by insider *Potter Stephen N* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2008-07-18	NTRS	Northern Trust Corp	Sale	19,572	77.28	1,512,502
2008-07-18	NTRS	Northern Trust Corp	Option Exercise	19,572	45.16	883,799
2008-04-17	NTRS	Northern Trust Corp	Option Exercise	4,428	45.16	199,952
2008-01-18	NTRS	Northern Trust Corp	Option Exercise	2,890	34.59	99,976
2007-10-22	NTRS	Northern Trust Corp	Sale	10,000	68.52	685,236
2007-04-23	NTRS	Northern Trust Corp	Option Exercise	13,110	34.59	453,524

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 Potter Stephen N (EVP/President NTGI of Northern Trust Corp at the time of this reporting) see the Securities and Exchange Commission (SEC) website.