4 1 exceloncorp4cosway20580.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) 03/02 ------------------------------- 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 ------------------------------------------------------------------------------ 7.Individul or Joint/Group Filing (Check Applicable Line) [X] Form filed by one reporting person [ ] Form filed by more than one reporting person --------------------------------------------------------------------------------

------------------------------------------------------------------------------------------------------------------------------------ TABLE I -- NON-DERIVATIVE SECURITIES ACQUIRED, DISPOSED OF, OR BENEFICIALLY OWNED ------------------------------------------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------------------------------------------ 1. Title of Security 2. Trans- 3. Transac- 4. Securities Acquired (A) 5. Amount of Se- 6. Owner- 7. Nature (Instr. 3) action tion or Disposed of (D) curities Benefi- ship of In- Date Code (Instr. 3, 4 and 5) cially Owned at Form: direct (Instr. 8) End of Month Direct Benefi- (Month/ (Instr. 3 and 4) (D) or cial Day/ --------------------------------------- Indirect Owner- Year) Code V Amount (A) or Price (I) ship (D) (Instr. 4) (Instr.4) ------------------------------------------------------------------------------------------------------------------------------------ Common stock 2/26/02 S 12,400 D 1.00 110,578 D ------------------------------------------------------------------------------------------------------------------------------------ Common stock 2/26/02 S 7,600 D 1.01 110,578 D ------------------------------------------------------------------------------------------------------------------------------------ Common stock 2/26/02 S 5,000 D 1.04 110,578 D ------------------------------------------------------------------------------------------------------------------------------------ Common stock 2/27/02 S 15,000 D 1.02 110,578 D ------------------------------------------------------------------------------------------------------------------------------------ Common stock 2/27/02 S 5,000 D 1.03 110,578 D ------------------------------------------------------------------------------------------------------------------------------------ Common stock 2/27/02 S 5,000 D 1.05 110,578 D ------------------------------------------------------------------------------------------------------------------------------------ Common stock 2/27/02 S 5,000 D 1.07 110,578 D ------------------------------------------------------------------------------------------------------------------------------------ Common stock 2/28/02 S 5,000 D 1.07 110,578 D ------------------------------------------------------------------------------------------------------------------------------------ Common stock 2/28/02 S 15,000 D 1.06 110,578 D ------------------------------------------------------------------------------------------------------------------------------------ Common stock 2/28/02 S 5,000 D 1.09 110,578 D ------------------------------------------------------------------------------------------------------------------------------------ Common stock 2/28/02 S 5,000 D 1.11 110,578 D ------------------------------------------------------------------------------------------------------------------------------------ Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. Page 1 of 2 * If the form is filed by more than one reporting person, see Instruction 4(b)(v). SEC 1474 (7-96)

FORM 4 (CONTINUED) TABLE II -- DERIVATIVE SECURITIES ACQUIRED, DISPOSED OF, OR BENEFICIALLY OWNED (E.G., PUTS, CALLS, WARRANTS, OPTIONS, CONVERTIBLE SECURITIES) ------------------------------------------------------------------------------------------------------------------------------------ 1. Title of Derivative 2. Conver- 3. Trans- 4. Trans- 5. Number of 6. Date Exer- 7. Title and Amount 8. Price Security sion or action action Derivative cisable and of Underlying of (Instr. 3) Exercise Date Code Securities Ac- Expiration Securities Deriv- Price of (Month/ (Instr. 8) quired (A) or Date (Instr. 3 and 4) ative Deriv- Day/ Disposed of (D) (Month/Day/ Secur- ative Year) (Instr. 3, 4, Year) ity Security and 5) (Instr. 5) ----------------------------------- Date Expira- Amount or -------------------------- Exer- tion Title Number of Code V (A) (D) cisable Date Shares ------------------------------------------------------------------------------------------------------------------------------------ Stock Option 1.13 3/07/02 V D common stock 292,584 .80 ------------------------------------------------------------------------------------------------------------------------------------ 9. Number of 10. Ownership 11. Nature of Derivative Form of Indirect Securities Derivative Beneficial Beneficially Security: Ownership Owned at End Direct (D) (Instr. 4) of Month or Indirect (I) (Instr. 4) (Instr. 4) -------------------------------------------------------------------------------- 0 D --------------------------------------------------------------------------------

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 04/10/02 ------------------------------- -------- **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)

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