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): June 28, 2000 Commission Registrant; State of Incorporation; IRS Employer File Number Address; and Telephone Number Identification No. 1-11375 UNICOM CORPORATION 36-3961038 (an Illinois corporation) 37th Floor, 10 South Dearborn Street Post Office Box A-3005 Chicago, Illinois 60690-3005 312/394-7399 1-1839 COMMONWEALTH EDISON COMPANY 36-0938600 (an Illinois corporation) 37th Floor, 10 South Dearborn Street Post Office Box 767 Chicago, Illinois 60690-0767 312/394-4321 Item 5. Other Events This Form 8-K contains forward-looking statements, which are inherently uncertain, subject to risks and should be viewed with caution. Actual results or experience could differ materially from the forward-looking statements as a result of many factors. For a discussion of these factors, please refer to the Unicom and PECO Energy Joint Proxy Statement/Prospectus for the 2000 Annual Shareholders meeting. On June 28, 2000, Unicom issued a news release announcing Unicom shareholders approval of the Merger with PECO Energy Company. The news release is attached hereto as Exhibit-99 and is hereby incorporated by reference. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrants have duly caused this report to be signed on their behalf by the undersigned thereunto duly authorized. UNICOM CORPORATION (Registrant) Date: June 29, 2000 By: /s/ Ruth Ann M. Gillis --------------------------- Ruth Ann M. Gillis Senior Vice President COMMONWEALTH EDISON COMPANY (Registrant) Date: June 29, 2000 By: /s/ Ruth Ann M. Gillis ---------------------------- Ruth Ann M. Gillis Senior Vice President EXHIBIT INDEX Exhibit Number Description of Exhibit 1. None 2. None 4. None 16. None 17. None 20. None 23. None 24. None 27. None 99. News release dated June 28, 2000 issued by Unicom Corporation