X0303 4 2010-04-29 0000073124 NORTHERN TRUST CORP NTRS 0001393081 St Clair Joyce 50 SOUTH LASALLE STREET CHICAGO IL 60603 0 1 0 0 Executive Vice President Common Stock 2010-04-29 4 M 0 1913 52.30 A 24050 I By Trust Common Stock 2010-04-29 4 F 0 1813 52.30 D 22237 I By Trust Common Stock 2010-04-30 5 G 0 190 0 D 22047 I By Trust Common Stock 2010-04-30 4 S 0 7272 55.50 D 14775 I By Trust Common Stock 30995 D Common Stock 5107 I 401(k) Employee Stock Option (right to buy) 52.30 2010-04-29 4 M 0 1913 0 D 2003-05-20 2012-05-20 Common Stock 1913 13087 D Represents stock units payable automatically on a 1-for-1 basis in shares of the Corporation's common stock as of 3-31-2010 Paul A. Bernacki Attorney-in-Fact for Joyce St. Clair 2010-05-03