X0202 4 2007-10-22 0000073124 NORTHERN TRUST CORP NTRS 0001378549 Potter Stephen N 50 S. LA SALLE ST. CHICAGO IL 60603 0 1 0 0 Executive Vice President Common Stock 880 I Spouse as Trustee for Daughter Common Stock 19188 D Common Stock 8292.1963 I 401(k) Represents stock units payable automatically on a 1-for-1 basis in shares of the Corporation's common stock. as of 9/30/07 This Form 4 is being filed as Part 2 and is a continuation of Part 1 (due to the thirty row maximum allowed on Table I). Paul A. Bernacki Attorney-in-Fact for Stephen N. Potter 2007-10-24