4 1 excelon4cosway20572.txt FORM 4 ------------------------------ OMB APPROVAL ------------------------------ OMB Number: 3235-0287 +--------+ Expires: September 30, 1998 | FORM 4 | Estimated average burden +--------+ hours per response ....... 0.5 ------------------------------ U.S. SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940 -------------------------------------------------------------------------------- 1.Name and Address of Reporting Person Cosway Mark ------------------------------------------------------------------------------ (Last) (First) (Middle) c/o eXcelon Corporation 25 Mall Road ------------------------------------------------------------------------------ (Street) Burlington MA 01803 ------------------------------------------------------------------------------ (City) (State) (Zip) 2.Issuer Name and Ticker or Trading Symbol eXcelon Corporation ("EXLN") ------------------------------------- 3.IRS or Social Security Number of Reporting Person (Voluntary) ---------------- 4.Date of Event Requiring Statement (Month/Year) 02/02 ------------------------------- 5.If Amendment, Date of Original (Month/Day/Year) ------------------------------- 6.Relationship of Reporting Person to Issuer (Check all applicable) [ ] Director [ ] Officer [ ] 10% Owner [X] Other (give title below) (specify below) Former President Executive Sales ------------------------------------------------------------------------------ 7.Individul or Joint/Group Filing (Check Applicable Line) [X] Form filed by one reporting person [ ] Form filed by more than one reporting person --------------------------------------------------------------------------------

Explanation of Responses: ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a). /s/ Mark Cosway 03/13/02 ------------------------------- -------- **Signature of Reporting Person Date BY: Mark Cosway Note: File three copies of this Form, one of which must be manually signed. Page 2 of 2 If space provided is insufficient, see Instruction 6 for procedure. Page 2 of 2 SEC 1474 (7-96)

EXCELON CORP 4