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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
73124	Northern Trust Corp	NTRS	State Commercial Banks (6022)	362723087

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1188083	P Timothy Moen	50 South Lasalle Street Chicago IL 60603	Executive Vice President	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2011-01-21	18,847	$48.76	50,068	No	4	M	Indirect	By Trust
Common Stock	Disposition	2011-01-21	18,847	$52.86	31,221	No	4	S	Indirect	By Trust

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Indirect	By Trust
No	4	S	Indirect	By Trust

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option (right to buy)	Disposition	2011-01-21	18,847	$0.00	18,847	$48.76

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2011-10-15	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	28,706	Direct
Common Stock	5	Indirect	401(k)

Footnotes

The price in Column 4 is a weighted average price. The prices actually received ranged from $52.81to $52.91. Upon request, the reporting person will provide to the SEC staff, the issuer, or any security holder of the issuer, full information regarding the number of shares sold at each separate price within this range.
Represents stock units payable automatically on a 1-for-1 basis in shares of the Corporation's common stock.
as of 12/31/2010
Exercisable on 10/15/2002; 10/15/2003; and 10/15/2004