X0303 4 2008-07-22 0000073124 NORTHERN TRUST CORP NTRS 0001143959 MCCORMACK ROBERT C 50 SOUTH LASALLE STREET CHICAGO IL 60603 1 0 0 0 Common Stock 2008-07-22 4 S 0 70000 79.2939 D 1303159 I By Trust Common Stock 2008-07-23 4 S 0 4000 80.50 D 20851 I By Spouse Common Stock 2008-07-23 5 G 0 1604 0 D 104796 I By Trust Common Stock 6403 D Common Stock 1036400 I By Trust Common Stock 1327552 I By Trust Common Stock 315518 I By Trust The price in Column 4 is a weighted average price. The prices actually received ranged from $79.00 to $79.74. 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. These shares are held in a trust of which Mr. McCormack is a co-trustee and beneficiary. Mr. McCormack's sons have the remainder interest in the trust. These shares are held in a trust for the benefit of Mr. McCormack's sister-in-law. Mr. McCormack is a co-trustee of the trust. Reporting person disclaims beneficial ownership. Represents stock units payable automatically on a 1-for-1 basis in shares of the Corporation's common stock. These shares are held in a trust for the benefit of Mr. McCormack's sister-in-law. Mr. McCormack is a co-trustee of the trust. Reporting person disclaims beneficial ownership. These shares are held in a trust for the benefit of Mr. McCormack's brother. Mr. McCormack is a co-trustee of the trust. Reporting person disclaims beneficial ownership. These shares are held in a revocable trust of which Mr. McCormack is a co-trustee and beneficiary. Paul A. Bernacki Attorney-In-Fact for Robert C. McCormack 2008-07-24