X0202 4 2005-05-27 0001109357 EXELON CORP EXC 0001184016 CLARK FRANK M 10 SOUTH DEARBORN STREET 37TH FLOOR CHICAGO IL 60603 0 1 0 0 Executive Vice President Common Stock 2005-05-26 5 G 0 129 D 35018 D Common Stock (Deferred Shares) 24792 I By Stock Deferral Plan Performance Shares - Stock Units Common Stock 18548 D Deferred Comp. - Phantom Shares 2005-05-27 4 A 0 51 46.93 A Common Stock 51 9969 D Share donation to a charitable organization. Performance Shares awarded pursuant to the Exelon Long Term Incentive Plan. 1/3 of the shares awarded vest immediately upon receipt. The remaining shares vest in 1/3 increments on each of the second and third anniversaries of the award date. Under certain circumstances up to one half of the second and third vestings may either be settled in common stock on a 1 for 1 basis, or be settled in cash based on the cash value of the underlying stock on the date of vesting. Phantom shares held in a multi-fund deferred compensation plan to be settled for cash upon the reporting person's termination of employment for any reason on a 1:1 basis. Shares are acquired through regular periodic contributions, company matching contributions, and the automatic reinvestment of dividends. Scott N. Peters, Attorney in Fact for Frank M. Clark 2005-05-31