9344747.2


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 FORM 3                                        OMB APPROVAL
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                                       OMB Number:       3235-0104
                                       Expires:  January 31, 2005
                                       Estimated average burden
                                       hours per response      0.5
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                     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
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(Print or Type Responses)
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1. Name and Address of Reporting Person*

   Ardsley Advisory Partners
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   (Last)                (First)             (Middle)

   262 Harbor Drive
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                         (Street)

 Stamford             CT                  06902
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  (City)            (State)               (Zip)

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2. Date of Event Requiring Statement (Month/Day/Year)

   12/04/02







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3. IRS Identification Number of Reporting Person, if an entity (Voluntary)


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4. Issuer Name and Ticker or Trading Symbol

   OM Group, Inc. (OMG)
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5. Relationship of Reporting Person to Issuer (Check all applicable)

   [   ] Director
   [ X ] 10% Owner
   [   ] Officer (give title Below)
   [   ] Other (Specify below)(1)


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6. If Amendment, Date of Original (Month/Day/Year)


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7. Individual or Joint/Group Filing (Check applicable line)

   [   ] Form filed by One Reporting Person
   [ X ] Form filed by More than One Reporting Person
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                      Table I--Non-Derivative Securities Beneficially Owned

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1. Title of Security        2. Amount of Securities   3. Ownership         4. Nature of Indirect
   (Instr.4)                   Beneficially Owned        Form: Direct (D)     Beneficial Ownership
                               (Instr. 4)                or Indirect (I)      (Instr. 4)
                                                         (Instr. 5)


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 OM Group, Inc. Common
 Stock, $0.01 par value
 per share ("Common Stock")      2,850,000                 I(1)                         (1)
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Reminder: Report on a separate line for each class of securities beneficially owned
directly or indirectly.                                                                    (Over)

                                        (Print or Type Responses)





FORM 3 (continued)




        Table II--Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

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1. Title of Derivative    2. Date Exercisable        3. Title and Amount    4. Conversion    5. Ownership Form      6. Nature of
   Security                  and Expiration Date        of Securities          or Exercise      of Derivative          Indirect
   (Instr. 4)                Month/Day/Year             Underlying             Price of         Security: Direct       Beneficial
                           ------------------------     Derivative             Derivative       (D) or Indirect (I)    Ownership
                              Date       Expiration     Security               Security         (Instr. 5)             (Instr. 5)
                            Exercisable     Date        (Instr. 4)
                                                      --------------------
                                                        Title  Amount or
                                                               Number of
                                                                Shares
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Explanation of Responses:

(1) The shares of Common Stock to which this note  relates are held  directly by
Ardsley  Offshore  Fund Ltd., a British  Virgin  Islands  corporation  ("Ardsley
Offshore"),  as to 775,000  shares;  Ardsley  Partners Fund II, L.P., a Delaware
limited partnership ("Ardsley Fund II"), as to 725,000 shares;  Ardsley Partners
Fund I, L.P., a Delaware limited  partnership  ("Ardsley Fund I"), as to 425,000
shares;   Ardsley  Partners   Institutional   Fund,  L.P.,  a  Delaware  limited
partnership,  ("Ardsley  Institutional"),  as to  450,000  shares;  and  Augusta
Partners L.P. a Delaware limited partnership ("Augusta"),  as to 475,000 shares.
Ardsley  Advisory  Partners serves as investment  manager to, and has investment
discretion  over the  securities  held by  Ardsley  Offshore.  Ardsley  Advisory
Partners also serves a non-managing  member of Augusta  Management  L.L.C.,  the
investment advisor to Augusta and has investment  discretion over the securities
held by Augusta.  Ardsley  Partners I serves as the general  partner of, and has
investment  discretion over the securities held by Ardsley Fund II, Ardsley Fund
I and  Ardsley  Institutional.  Ardsley  Partners I also  serves as the  general
partner of Ardsley  Advisory  Partners.  Philip J.  Hempelman,  is the  managing
partner of Ardsley Advisory Partners and the general partner of Ardsley Partners
I. Ardsley  Advisory  Partners,  Ardsley Partners I and Philip J. Hempelman each
disclaim any  beneficial  ownership of any of the Issuer's  securities  to which
this Form 3 relates for the  purposes of Section 16 of the  Securities  Exchange
Act of 1934, as amended, except as to such securities representing in which each
such person may be deemed to have an  indirect  pecuniary  interest  pursuant to
Rule 16a-1(a)(2).


*If the Form is filed by more than one Reporting Person, see instruction
5(b)(v).
**Intentional misstatements or omissions of facts constitute Federal
Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

                               ARDSLEY ADVISORY PARTNERS

                               /s/ Philip J. Hempelman,            12/09/02
                               ---------------------------------   --------
                                Name: Philip J. Hempelman            Date
                                Title: Managing Partner
                              **Signature of Reporting Person

Note:  File three copies of this form, one of which must be manually signed.
       If space provided is insufficient, see Instruction 6 for procedure.

                               (Print or Type Responses)


                             Joint Filer Information

Name:  Ardsley Offshore Fund Ltd.
Address:   Romasaco Place, Wickhams Cay 1, Roadtown Tortola,
           British Virgin Islands
Designated Filer:  Ardsley Advisory Partners
Issuer & Ticker Symbol:  OM Group, Inc.(OMG)
Date of Event Requiring Statement:   12/04/02

Signature: Ardsley Offshore Fund, Ltd.

                  By: Neil Glass, its Vice President and Administrative Manager
                  By:   /s/ Neil Glass
                  -------------------------------------------------------------
                  Name:  Neil Glass
                  Title: Vice President and Administrative Manager

Name:  Ardsley Partners Fund II, L.P.
Address:   262 Harbor Drive, Stamford, Connecticut 06902
Designated Filer:  Ardsley Advisory Partners
Issuer & Ticker Symbol:  OM Group, Inc.(OMG)
Date of Event Requiring Statement:   12/04/02

Signature: Ardsley Partners Fund II, L.P.

                  By: Ardsley Partners I, its general partner
                  By:   /s/ Philip J. Hempelman
                  -----------------------------------------------------------
                  Name: Philip J. Hempelman
                  Title: Managing Partner


Name:  Ardsley Partners Fund I, L.P.
Address:   262 Harbor Drive, Stamford, Connecticut 06902
Designated Filer:  Ardsley Advisory Partners
Issuer & Ticker Symbol:  OM Group, Inc.(OMG)
Date of Event Requiring Statement:   12/04/02

Signature: Ardsley Partners Fund I, L.P.

                  By: Ardsley Partners I, its general partner
                  By:   /s/ Philip J. Hempelman
                  -----------------------------------------------------------
                  Name: Philip J. Hempelman
                  Title: Managing Partner


Name: Ardsley Partners Institutional Fund, L.P.
Address:   262 Harbor Drive, Stamford, Connecticut 06902
Designated Filer:  Ardsley Advisory Partners
Issuer & Ticker Symbol:  OM Group, Inc.(OMG)
Date of Event Requiring Statement:   12/04/02

Signature: Ardsley Partners Institutional Fund, L.P.

                  By: Ardsley Partners I, its general partner
                  By:   /s/ Philip J. Hempelman
                  -----------------------------------------------------------
                  Name: Philip J. Hempelman
                  Title: Managing Partner










Name: Augusta Partners L.P.
Address:   622 Third Avenue, New York, New York 10017
Designated Filer:  Ardsley Advisory Partners
Issuer & Ticker Symbol:  OM Group, Inc.(OMG)
Date of Event Requiring Statement:   12/04/02

Signature: Augusta Partners L.P.

                  By: Howard Singer, its general partner
                  By:   /s/ Howard Singer
                  -----------------------------------------------------------
                  Name: Howard Singer
                  Title: General Partner


Name:  Ardsley Partners I
Address:   262 Harbor Drive, Stamford, Connecticut 06902
Designated Filer:  Ardsley Advisory Partners
Issuer & Ticker Symbol:  OM Group, Inc.(OMG)
Date of Event Requiring Statement:   12/04/02

Signature: Ardsley Partners I

                  By:   /s/ Philip J. Hempelman
                  -----------------------------------------------------------
                  Name: Philip J. Hempelman
                  Title: Managing Partner


Name: Philip J. Hempelman
Address:  c/o Ardsley Advisory Partners  262 Harbor Drive, Stamford,
          Connecticut 06902
Designated Filer:  Ardsley Advisory Partners
Issuer & Ticker Symbol:  OM Group, Inc.(OMG)
Date of Event Requiring Statement:   12/04/02

Signature:        /s/ Philip J. Hempelman
                  -----------------------------------------------------------
                  Name: Philip J. Hempelman