X0303 4/A 2008-10-24 2008-10-28 0000073124 NORTHERN TRUST CORP NTRS 0001378549 Potter Stephen N 50 SOUTH LA SALLE STREET CHICAGO IL 60603 0 1 0 0 EVP/President NTGI Common Stock 29221 I By Trust This number in line 3, column 5 was incorrectly reported on the previously filed Form 4. All other numbers and footnotes were correctly reported on the previously filed Form 4. Paul A. Bernacki Attorney-in-Fact for Stephen N. Potter 2008-11-04