UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP FORM 4 [ ] Check this box if no longer OMB APROVAL subject to Section 16. Form 4 or OMB NUMBER: 3235-0287 Form 5 obligations may continue. Expires: September 30, 1998 See Instruction 1(b). Estimated average burden hours per response........0.5 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 (Print or Type Responses) 1. Name and Address of Reporting Person* Harding William J. ----------------------------------------------------------------------------- (Last) (First) (Middle) 108 Crescent Avenue ----------------------------------------------------------------------------- (Street) Portola Valley CA 94028 ----------------------------------------------------------------------------- (City) (State) (Zip) 2. Issuer Name and Ticker or Trading Symbol Commerce One, Inc. (CMRC) ----------------------------------------------------------------------------- 3. I.R.S. Number or Social Security of Reporting Person (Voluntary) ----------------------------------------------------------------------------- 4. Statement for Month/Year 01/2001 ----------------------------------------------------------------------------- 5. If Amendment, Date of Original (Month/Day/Year) ----------------------------------------------------------------------------- 6. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner --- --- Officer (give title below) Other (specify below) --- --- ---------------------------------------------------------------------------- 7. Individual 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. Trans- 4. Securities Acquired 5. Amount of Securities 6. Ownership 7. Nature of (Instr. 3) action action (A) or Disposed of Beneficially Owned Form: Direct Indirect Date Code (D) (Instr. 3, 4 at End of Month (D) or In- Beneficial (Instr.8) and 5) (Instr. 3 and 4) direct (I) Ownership (Month/ (Instr. 4) (Instr. 4) Day/ (A) or Year) Code V Amount (D) Price ------------------------- --------- ---- --- ------- --- --------- -------------------- -------------- ------------- ~~Common Stock 1/26/01 S 10,000 D $32.20 96,005 D~~

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. * If the form is filed by more than one reporting person, see Instruction 4(b)(v). (Over) SEC 1475 (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 2. Conversion or 3. Transaction Date 4. Transaction 5. Number of 6. Date Exercisable and Derivative Exercise Price (Month/Day/Year) Code Derivative Expiration Date Security of Derivative (Instr. 8) Securities (Month/Day/Year) (Instr. 3) Security Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) Date Expiration Code V (A) (D) Exercisable Date ------------------------------------------------------------------------------------------------------------------------------------ 1. Title of 7. Title and Amount of 8. Price of 9. Number of 10. Ownership 11. Nature of Derivative Underlying Securities Derivative Derivative Form of Indirect Security (Instr. 3 and 4) Security Securities Derivative Beneficial (Instr. 3) (Instr. 5) Beneficially Security: Ownership Amount Owned at End Direct (D) (Instr. 4) or of Month or Indirect Number (Instr. 4) (I) of (Instr. 4) Title Shares ------------------------------------------------------------------------------------------------------------------------------------

Explanation of Responses: By: /s/ Debra Abramovitz 2/1/01 ------------------------------- ------------------------ **Signature of Reporting Person Date Debra Abramovitz, Attorney-in- Fact for William J. Harding **Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a). Note: File three copies of this Form, one of which must be manually signed. If space provided is insufficient, see Instruction 6 for procedure. Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number. Page 2 SEC 1474 (7-96)

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