SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15 (d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) August 13, 2002 ------------------------------- NORTHERN TRUST CORPORATION ------------------------------------------------------------------------------- (Exact name of registrant as specified in its charter) Delaware ------------------------------------------------------------------------------- (State or other jurisdiction of incorporation) 0-5965 36-2723087 ------------------------------------- ------------------------------------- (Commission File Number) (IRS Employer Identification No.) Fifty South LaSalle Street, Chicago, Illinois 60675 ------------------------------------------------------------------------------- (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code (312) 630-6000 ----------------------------- Item 9. Regulation FD Disclosure Cover letter to the Securities and Exchange Commission, a copy of which is filed as Exhibit 99.1 hereto, is incorporated herein by reference. A "Statement Under Oath of Principal Executive Officer Regarding Facts and Circumstances Relating to Exchange Act Filings" was filed with the Securities and Exchange Commission on August 13, 2002, a copy of which is filed as Exhibit 99.2 hereto, is incorporated herein by reference. A "Statement Under Oath of Principal Financial Officer Regarding Facts and Circumstances Relating to Exchange Act Filings" was filed with the Securities and Exchange Commission on August 13, 2002, a copy of which is filed as Exhibit 99.3 hereto, is incorporated herein by reference. 2 SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. NORTHERN TRUST CORPORATION -------------------------- (Registrant) Dated: August 13, 2002 By: /s/ Perry R. Pero ------------------ Perry R. Pero Vice Chairman and Chief Financial Officer 3 EXHIBIT INDEX Number Description Page Number ------ ----------- ----------- 99.1 Cover Letter to the Securities and Exchange Commission 5 99.2 Statement Under Oath of Principal Executive Officer Regarding Facts and Circumstances Relating to Exchange Act Filings 6 99.3 Statement Under Oath of Principal Financial Officer Regarding Facts and Circumstances Relating to Exchange Act Filings 7 4