OM GROUP INC
SC 13G, 1997-02-07
INDUSTRIAL INORGANIC CHEMICALS
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                                                  Page 1 of 8 Pages

                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                 SCHEDULE 13G

                   Under the Securities Exchange Act of 1934
                          (Amendment No.____________)*

                                O.M. GROUP, INC.
             -----------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
             -----------------------------------------------------
                         (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>
<PAGE>
                                            Page 2 of 8 Pages

                            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)  [X]
                                                             (b)  [ ]
- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- --------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION

       New York
- --------------------------------------------------------------------------------
   NUMBER OF      5    SOLE VOTING POWER
     SHARES            1,008,000  
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      6    SHARED VOTING POWER
      EACH        
   REPORTING      --------------------------------------------------------------
     PERSON       7    SOLE DISPOSITIVE POWER
      WITH             1,008,000
                  --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

- --------------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

       1,008,000
- --------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       5.4%
- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

       IA
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT

<PAGE>
<PAGE>
                                                Page 3 of 8 Pages

                            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)  [X]
                                                             (b)  [ ]
- --------------------------------------------------------------------------------
   3   SEC USE ONLY


- --------------------------------------------------------------------------------
   4   CITIZENSHIP OR PLACE OF ORGANIZATION

       New York
- --------------------------------------------------------------------------------
   NUMBER OF      5    SOLE VOTING POWER
     SHARES             74,250        
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      6    SHARED VOTING POWER
      EACH        
   REPORTING      --------------------------------------------------------------
     PERSON       7    SOLE DISPOSITIVE POWER
      WITH              74,250
                  --------------------------------------------------------------
                  8    SHARED DISPOSITIVE POWER

- --------------------------------------------------------------------------------
   9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        74,250
- --------------------------------------------------------------------------------
  10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- --------------------------------------------------------------------------------
  11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

       0.4%
- --------------------------------------------------------------------------------
  12   TYPE OF REPORTING PERSON*

       IA
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT




<PAGE>
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                                            Page 4 of 8 Pages

Item 1.
        (a)  Name of Issuer:
             O.M. Group, Inc.
        (b)  Address of Issuer's Principal Executive Offices:
             3800 Terminal Tower
             Cleveland, OH 44113-2204

Item 2.
        (a)  Name of Persons Filing:
               BAMCO, Inc. ("BAMCO")
               Baron Capital Management, Inc. ("BCM")
        (b)  Address of Principal Business Office:
               767 Fifth Avenue
               24th Floor
               New York, NY 10153
        (c)  Citizenship:
               BAMCO and BCM are New York corporations
        (d)  Title of Class Securities:
               Common Stock
        (e)  CUSIP Number:
               670872100

Item 3.    PERSONS FILING

        BAMCO and BCM are:
              (e) Investment Advisers registered under section 203 of
                  the Investment Advisors Act Of 1940
              (h) Group, in accordance with Rule 13d-1(b)(1)(ii)(F)

Item 4.    OWNERSHIP^

         (a) Amount Beneficially Owned as of December 31, 1996: 
               BAMCO:  1,008,000 shares
               BCM:       74,250 shares
         (b) Percent of Class:
               BAMCO:  5.4%
               BCM:    0.4%




[FN]
^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>
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                                                Page 5 of 8 Pages

          (c) Number of shares as to which such person has:
                (i)   sole power to vote or direct the vote:
                          BAMCO:  1,008,000
                          BCM:       74,250
                (ii)  shared power to vote or direct the vote:
                          BAMCO:   0
                          BCM:     0
                (iii) sole power to dispose or to direct the disposition of:*
                          BAMCO:  1,008,000
                          BCM:       74,250
                (iv)  shared power to dispose or direct the disposition of:*
                          BAMCO:   0
                          BCM:     0
 
Item 5.  OWNERSHIP OF 5% OR LESS OF A CLASS

         Not applicable.
            
Item 6.  OWNERSHIP OF MORE THAN 5% ON BEHALF OF ANOTHER PERSON
 
         The advisory clients of BAMCO and BCM have the right to receive
or the power to direct the receipt of dividends from, or the proceeds 
from the sale of, the Issuer's common stock in their accounts.  To the
best of the Filing Persons' knowledge, no such person has such interest
relating to more than 5% of the outstanding class of securities.

Item 7.  IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
         ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT
         HOLDING COMPANY

         Not applicable.

Item 8.  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

         See Item 3.






[FN]
* 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>
<PAGE>
                                                 Page 6 of 8 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 7, 1997

                        BAMCO, Inc. and Baron Capital Management, Inc.
                        By:
 
                       /s/ Ronald Baron
                        _______________________________________
                           Ronald Baron, President
<PAGE>
<PAGE>
                                             Page 7 of 8 Pages


                       Joint Filing Agreement



    The undersigned each hereby agree that the Schedule 13G dated
February 7, 1997, which relates to the common stock of O.M. 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 7, 1997


                                BAMCO, Inc.
                                Baron Capital Management, Inc.
                                By:

                                /s/ Ronald Baron
                                ______________________________
                                    Ronald Baron,President



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