Page 1 of 12 Pages UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 5)* OM GROUP, INC. ----------------------------------------------------- (Name of Issuer) COMMON ----------------------------------------------------- (Title of Class of Securities) 670872100 ----------------------------------------------------- (CUSIP Number) Check the following box if a fee is being paid with this statement [ ]. (A fee is not required only if the filing person: (1) has a previous statement on file reporting beneficial ownership of more than five percent of the class of securities described in Item 1; and (2) has filed no amendment subsequent thereto reporting beneficial ownership of five percent or less of such class.) (See Rule 13d-7.) *The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). Page 2 of 12 Pages Amendment Number 5 to Schedule 13G (continued) CUSIP No. 670872100 -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Baron Capital Group, Inc. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION New York -------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 BENEFICIALLY -------------------------------------------------------------- OWNED BY 6 SHARED VOTING POWER EACH 3,369,890 REPORTING -------------------------------------------------------------- PERSON 7 SOLE DISPOSITIVE POWER WITH 0 -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 3,369,890 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,369,890 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 14.0% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* HC, CO -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 3 of 12 Pages Amendment Number 5 to Schedule 13G (continued) CUSIP No. 670872100 -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON BAMCO, Inc. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION New York -------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 BENEFICIALLY -------------------------------------------------------------- OWNED BY 6 SHARED VOTING POWER EACH 2,780,300 REPORTING -------------------------------------------------------------- PERSON 7 SOLE DISPOSITIVE POWER WITH 0 -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 2,780,300 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,780,300 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 11.5% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IA, CO -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 4 of 12 Pages Amendment Number 5 to Schedule 13G (continued) CUSIP No. 670872100 -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Baron Capital Management, Inc. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION New York -------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 BENEFICIALLY -------------------------------------------------------------- OWNED BY 6 SHARED VOTING POWER EACH 589,590 REPORTING -------------------------------------------------------------- PERSON 7 SOLE DISPOSITIVE POWER WITH 0 -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 589,590 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 589,590 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 2.4% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IA, CO -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 5 of 12 Pages Amendment Number 5 to Schedule 13G (continued) CUSIP No. 670872100 -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Baron Asset Fund -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION New York -------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 BENEFICIALLY -------------------------------------------------------------- OWNED BY 6 SHARED VOTING POWER EACH 2,360,300 REPORTING ------------------------------------------------------------- PERSON 7 SOLE DISPOSITIVE POWER WITH 0 -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 2,360,300 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,360,300 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 9.8% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IA, CO -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 6 of 12 Pages Amendment Number 5 to Schedule 13G (continued) CUSIP No. 670872100 -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON Ronald Baron -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [ ] -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION USA -------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 BENEFICIALLY -------------------------------------------------------------- OWNED BY 6 SHARED VOTING POWER EACH 3,369,890 REPORTING -------------------------------------------------------------- PERSON 7 SOLE DISPOSITIVE POWER WITH 0 -------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 3,369,890 -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 3,369,890 -------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 14.0% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* HC, IN -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT Page 7 of 12 Pages Item 1. (a) Name of Issuer: OM GROUP, INC. (b) Address of Issuer's Principal Executive Offices: 3800 Terminal Tower Cleveland, OH 44113 Item 2. (a) Name of Persons Filing: Baron Capital Group, Inc. ("BCG") BAMCO, Inc. ("BAMCO") Baron Capital Management ("BCM") Baron Asset Fund ("BAF") Ronald Baron (b) Address of Principal Business Office: 767 Fifth Avenue New York, NY 10153 (c) Citizenship: BCG, BAMCO and BCM are New York corporations. BAF is a Massachusetts business trust and Ronald Baron is a citizen of the United States. (d) Title of Class Securities: COMMON (e) CUSIP Number: 670872100 Item 3. PERSONS FILING: BCG and Ronald Baron are: (g) Parent holding companies, in accordance with Section 240.13d-1(b)(ii)(G) BAMCO and BCM are: (e) Investment Advisers registered under Section 203 of the Investment Advisers Act of 1940 BAF is: (d) Investment Company registered under Section 8 of the Investment Company Act All persons filing are: (h) Group, in accordance with Rule 13d-1(b)(1)(ii)(F) Page 8 of 12 Pages Item 4. OWNERSHIP^ (a) Amount Beneficially Owned as of December 31, 2001: BCG: 3,369,890 shares BAMCO: 2,780,300 shares BCM: 589,590 shares BAF: 2,360,300 shares Ronald Baron: 3,369,890 shares (b) Percent of Class: BCG: 14.0% BAMCO: 11.5% BCM: 2.4% BAF: 9.8% Ronald Baron: 14.0% ^BCG and Ronald Baron disclaim beneficial ownership of shares held by their controlled entities (or the investment advisory clients thereof) to the extent such shares are held by persons other than BCG and Ronald Baron. BAMCO and BCM disclaim beneficial ownership of shares held by their investment advisory clients to the extent such shares are held by persons other than BAMCO, BCM and their affiliates. Page 9 of 12 Pages (c) Number of shares as to which such person has: (i) sole power to vote or direct the vote: BCG: 0 BAMCO: 0 BCM: 0 BAF: 0 Ronald Baron: 0 (ii) shared power to vote or direct the vote: BCG: 3,369,890 BAMCO: 2,780,300 BCM: 589,590 BAF: 2,360,300 Ronald Baron: 3,369,890 (iii) sole power to dispose or to direct the disposition of:* BCG: 0 BAMCO: 0 BCM: 0 BAF: 0 Ronald Baron: 0 (iv) shared power to dispose or direct the disposition of:* BCG: 3,369,890 BAMCO: 2,780,300 BCM: 589,590 BAF: 2,360,300 Ronald Baron: 3,369,890 Item 5. OWNERSHIP OF 5% OR LESS OF A CLASS Not applicable. Item 6. OWNERSHIP OF MORE THAN 5% ON BEHALF OF ANOTHER PERSON No material change. Item 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY BAMCO and BCM are subsidiaries of BCG. BAF is an investment advisory client of BAMCO. Ronald Baron owns a controlling interest in BCG. Item 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP See Item 3. * By virtue of investment advisory agreements with their respective clients, BAMCO and BCM have been given the discretion to dispose or the disposition of the securities in the advisory accounts. All such discretionary agreements, are however, revocable. Page 10 of 12 Pages Item 9. NOTICE OF DISSOLUTION OF GROUP Not applicable. Item 10. Certification By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired in the ordinary course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having such purposes or effect. Signature After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Date: February 8, 2002 Baron Capital Group, Inc., BAMCO, Inc., Baron Capital Management, Inc. and Baron Asset Fund By: /s/ Ronald Baron _______________________________________ Ronald Baron, Chairman and CEO Ronald Baron, Individually By: /s/ Ronald Baron _______________________________________ Ronald Baron Page 11 of 12 Pages Joint Filing Agreement The undersigned each hereby agree that the Schedule 13G dated February 8, 2002, which relates to the common stock of OM Group, Inc., is to be filed jointly on behalf of each of them for the reasons stated therein, and any amendments thereto shall be filed jointly by the undersigned. Dated: February 8, 2002 Baron Capital Group, Inc., BAMCO, Inc., Baron Capital Management, Inc. and Baron Asset Fund By: /s/ Ronald Baron _______________________________________ Ronald Baron, Chairman and CEO Ronald Baron, Individually By: /s/ Ronald Baron _______________________________________ Ronald Baron