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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
1188087	R Kelly Welsh	50 South Lasalle Street Chicago IL 60603	Evp & General Counsel	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	2013-05-15	27,500	$49.12	73,865	No	4	M	Indirect	By Trust
Commoon Stock	Disposition	2013-05-15	27,500	$56.99	46,365	No	4	S	Indirect	By Trust
Common Stock	Acquisiton	2013-05-15	22,500	$44.47	68,865	No	4	M	Indirect	By Trust
Common Stock	Disposition	2013-05-15	22,500	$56.99	46,365	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
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	2013-05-15	27,500	$0.00	27,500	$49.12
Common Stock	Employee Stock Option (right-to-buy)	Disposition	2013-05-15	22,500	$0.00	22,500	$44.47

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2014-02-17	No	4	M	Direct
22,500	2005-03-31	2015-02-15	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	41,179	Direct
Common Stock	700	Indirect	By 401(k)

Footnotes

This option exercise was made pursuant to a written plan adopted in accordance with SEC Rule 10b5-1.
This sale was made pursuant to a written plan adopted in accordance with SEC Rule 10b5-1.
The price in Column 4 is the weighted average price. The prices actually received ranged from $56.95 to $57.19. 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 03/31/2013
The option became exercisable in four equal annual installments beginning February 17, 2005.