X0202 4 2005-05-26 0001109357 EXELON CORP EXC 0001185162 MITCHELL J BARRY 10 SOUTH DEARBORN STREET 37TH FLOOR CHICAGO IL 60603 0 1 0 0 Senior Vice President and CFO Common Stock 2005-05-26 4 M 0 13500 18.84 A 36179 D Common Stock 2005-05-26 4 S 0 13500 46.35 D 22679 D Common Stock (Deferred Shares) 19394 I By Stock Deferral Plan Common Stock (401k Shares) 5480 D Performance Shares - Stock Units Common Stock 11156 D NQ Stock Options (02/23/1999) 18.84 2005-05-26 4 M 0 13500 D Common Stock 13500 0 D Deferred Comp. - Phantom Shares 2005-05-27 4 A 0 13 46.93 A Common Stock 13 4892 D Exercise and sale made pursuant to a rule 10b5-1 trading plan entered into on March 4, 2005. 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. Non qualified employee stock options, awarded pursuant to the Exelon Long Term Incentive Plan. Options vest in 1/3 increments on each of the first three anniversaries of the grant date, referenced in column one, and expire on the tenth anniversay of the grant date. Shares held as of 04/30/2005 in a multi-fund 401(k) Plan to be settled in 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. 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. Balance includes 42 shares acquired on 03/10/2005 through the automatic dividend reinvestment feature of Exelon plans. Scott N. Peters, Esq. Attorney in Fact for J. Barry Mitchell 2005-05-31