UNITED STATES 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): April 17, 2003 WINTRUST FINANCIAL CORPORATION (Exact Name of Registrant as Specified in its Charter) Commission File Number 0-21923 Illinois 36-3873352 - --------------------------------------------------------- --------------------------------------------------- (State or other Jurisdiction of Incorporation) (I.R.S. Employer Identification No.) 727 North Bank Lane Lake Forest, Illinois 60045 ------------------------------------------------------- (Address of Principal Executive Offices) (847) 615-4096 --------------------------------------------------------------------- (Registrant's Telephone Number, Including Area Code) ITEM 5. OTHER EVENTS. On April 17, 2003, Wintrust Financial Corporation (the "Company") announced earnings for the first quarter of 2003. Attached as Exhibit 99.1 is a copy of the press release relating to the Company's earnings results, which is incorporated herein by reference. ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS. (c) Exhibit Exhibit 99.1 - 1st Quarter 2003 Earnings Release dated April 17, 2003. ITEM 12. RESULTS OF OPERATIONS AND FINANCIAL CONDITION. Certain supplemental information relating to non-GAAP financial measures reported in the attached press release is included on page 10 of Exhibit 99.1. 2 SIGNATURES 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. WINTRUST FINANCIAL CORPORATION (Registrant) Date: April 17, 2003 /s/ David L. Stoehr ------------------------------------ Executive Vice President & Chief Financial Officer 3 EXHIBIT INDEX ------------- Exhibit - ------- 99.1 Press release dated April 17, 2003. 4