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


                                  SCHEDULE 13G

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 1)*

                                 OM GROUP, INC.
--------------------------------------------------------------------------------
                                (Name of Issuer)


                     Common Stock, $0.01 Par Value Per Share
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    670872100
                                    ---------
                                 (CUSIP Number)

                                December 31, 2007
                                -----------------
                      (Date of Event which Requires Filing
                               of this Statement)



Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

                  [ ]      Rule 13d-1(b)
                  [X]      Rule 13d-1(c)
                  [ ]      Rule 13d-1(d)



  *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 on 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 1 of 11





-----------------------------                               --------------------
CUSIP No. 670872100                      13G                Page 2 of 11 Pages
-----------------------------                               --------------------

---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           S.A.C. Capital Advisors, LLC
---------- ---------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                    (a) [ ]
                                                                    (b) [X]
---------- ---------------------------------------------------------------------
        3  SEC USE ONLY
---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
--------------------- ----- ----------------------------------------------------
                         5  SOLE VOTING POWER

                            0
                      ----- ----------------------------------------------------
                         6  SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED          1,027,000 (see Item 4)
BY EACH REPORTING     ----- ----------------------------------------------------
PERSON WITH              7  SOLE DISPOSITIVE POWER

                            0
                      ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            1,027,000 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,027,000 (see Item 4)
---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

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

           3.4% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------
                       *SEE INSTRUCTION BEFORE FILLING OUT

                                  Page 2 of 11





-----------------------------                               --------------------
CUSIP No. 670872100                      13G                Page 3 of 11 Pages
-----------------------------                               --------------------

---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           S.A.C. Capital Management, LLC
---------- ---------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                    (a) [ ]
                                                                    (b) [X]
---------- ---------------------------------------------------------------------
        3  SEC USE ONLY
---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
--------------------- ----- ----------------------------------------------------
                         5  SOLE VOTING POWER

                            0
                      ----- ----------------------------------------------------
                         6  SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED          1,027,000 (see Item 4)
BY EACH REPORTING     ----- ----------------------------------------------------
PERSON WITH              7  SOLE DISPOSITIVE POWER

                            0
                      ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            1,027,000 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,027,000 (see Item 4)
---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

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

           3.4% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------
                       *SEE INSTRUCTION BEFORE FILLING OUT

                                  Page 3 of 11




-----------------------------                               --------------------
CUSIP No. 670872100                      13G                Page 4 of 11 Pages
-----------------------------                               --------------------

---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           CR Intrinsic Investors, LLC
---------- ---------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                    (a) [ ]
                                                                    (b) [X]
---------- ---------------------------------------------------------------------
        3  SEC USE ONLY
---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Delaware
--------------------- ----- ----------------------------------------------------
                         5  SOLE VOTING POWER

                            0
                      ----- ----------------------------------------------------
                         6  SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED          1,530,000 (see Item 4)
BY EACH REPORTING     ----- ----------------------------------------------------
PERSON WITH              7  SOLE DISPOSITIVE POWER

                            0
                      ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            1,530,000 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,530,000 (see Item 4)
---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

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

           5.0% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------
                       *SEE INSTRUCTION BEFORE FILLING OUT

                                  Page 4 of 11




-----------------------------                               --------------------
CUSIP No. 670872100                      13G                Page 5 of 11 Pages
-----------------------------                               --------------------

---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           CR Intrinsic Investments, LLC
---------- ---------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                    (a) [ ]
                                                                    (b) [X]
---------- ---------------------------------------------------------------------
        3  SEC USE ONLY
---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           Anguilla, British West Indies
--------------------- ----- ----------------------------------------------------
                         5  SOLE VOTING POWER

                            0
                      ----- ----------------------------------------------------
                         6  SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED          1,530,000 (see Item 4)
BY EACH REPORTING     ----- ----------------------------------------------------
PERSON WITH              7  SOLE DISPOSITIVE POWER

                            0
                      ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            1,530,000 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,530,000 (see Item 4)
---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

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

           5.0% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------
                       *SEE INSTRUCTION BEFORE FILLING OUT

                                  Page 5 of 11




-----------------------------                               --------------------
CUSIP No. 670872100                      13G                Page 6 of 11 Pages
-----------------------------                               --------------------

---------- ---------------------------------------------------------------------
        1  NAME OF REPORTING PERSON
           I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Steven A. Cohen
---------- ---------------------------------------------------------------------
        2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                    (a) [ ]
                                                                    (b) [X]
---------- ---------------------------------------------------------------------
        3  SEC USE ONLY
---------- ---------------------------------------------------------------------
        4  CITIZENSHIP OR PLACE OF ORGANIZATION

           United States
--------------------- ----- ----------------------------------------------------
                         5  SOLE VOTING POWER

                            0
                      ----- ----------------------------------------------------
                         6  SHARED VOTING POWER
NUMBER OF SHARES
BENEFICIALLY OWNED          2,557,000 (see Item 4)
BY EACH REPORTING     ----- ----------------------------------------------------
PERSON WITH              7  SOLE DISPOSITIVE POWER

                            0
                      ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            2,557,000 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,557,000 (see Item 4)
---------- ---------------------------------------------------------------------
       10  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES

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

           8.4% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           IN
---------- ---------------------------------------------------------------------
                       *SEE INSTRUCTION BEFORE FILLING OUT

                                  Page 6 of 11





Item 1(a)           Name of Issuer:
                    --------------

                    OM Group, Inc.

Item 1(b)           Address of Issuer's Principal Executive Offices:
                    -----------------------------------------------

                    127 Public Square, 1500 Key Tower, Cleveland, Ohio
                    44114-1221

Items 2(a)          Name of Person Filing:
                    ---------------------

                    This statement is filed by: (i) S.A.C. Capital Advisors, LLC
                    ("SAC Capital Advisors") with respect to shares of common
                    stock, $0.01 par value per share ("Shares"), of the Issuer
                    beneficially owned by S.A.C. Capital Associates, LLC ("SAC
                    Capital Associates") and S.A.C. Select Fund, LLC ("SAC
                    Select Fund"); (ii) S.A.C. Capital Management, LLC ("SAC
                    Capital Management") with respect to Shares beneficially
                    owned by SAC Capital Associates and SAC Select Fund; (iii)
                    CR Intrinsic Investors, LLC ("CR Intrinsic Investors") with
                    respect to Shares beneficially owned by CR Intrinsic
                    Investments, LLC ("CR Intrinsic Investments"); (iv) CR
                    Intrinsic Investments with respect to Shares beneficially
                    owned by it; and (v) Steven A. Cohen with respect to Shares
                    beneficially owned by SAC Capital Advisors, SAC Capital
                    Management, SAC Capital Associates, SAC Select Fund, CR
                    Intrinsic Investors and CR Intrinsic Investments.

                    SAC Capital Advisors, SAC Capital Management, CR Intrinsic
                    Investors, CR Intrinsic Investments and Steven A. Cohen have
                    entered into a Joint Filing Agreement, a copy of which is
                    filed with this Schedule 13G as Exhibit 99.1, pursuant to
                    which they have agreed to file this Schedule 13G jointly in
                    accordance with the provisions of Rule 13d-1(k) of the
                    Securities Exchange Act of 1934, as amended.

Item 2(b)           Address of Principal Business Office:
                    ------------------------------------

                    The address of the principal business office of (i) SAC
                    Capital Advisors, CR Intrinsic Investors and Mr. Cohen is 72
                    Cummings Point Road, Stamford, Connecticut 06902, (ii) SAC
                    Capital Management is 540 Madison Avenue, New York, New York
                    10022, and (iii) CR Intrinsic Investments is Box 174,
                    Mitchell House, The Valley, Anguilla, British West Indies.

Item 2(c)           Citizenship:
                    -----------

                    SAC Capital Advisors, SAC Capital Management and CR
                    Intrinsic Investors are Delaware limited liability
                    companies. CR Instrinsic Investments is an Anguillan limited
                    liability company. Mr. Cohen is a United States citizen.

                                  Page 7 of 11


Item 2(d)           Title of Class of Securities:
                    ----------------------------

                    Common Stock, $0.01 par value per share

Item 2(e)           CUSIP Number:
                    ------------

                    670872100

Item 3              Not Applicable

Item 4              Ownership:
                    ---------

                    The percentages used herein are calculated based upon the
                    Shares issued and outstanding as of October 31, 2007 as
                    reported on the Issuer's quarterly report on Form 10-Q filed
                    with the Securities and Exchange Commission for the
                    quarterly period ended September 30, 2007.

                    As of the close of business on December 31, 2007:

                    1. S.A.C. Capital Advisors, LLC
                    (a) Amount beneficially owned: 1,027,000
                    (b) Percent of class: 3.4%
                    (c)(i) Sole power to vote or direct the vote: -0-
                    (ii) Shared power to vote or direct the vote: 1,027,000
                    (iii) Sole power to dispose or direct the disposition: -0-
                    (iv) Shared power to dispose or direct the disposition:
                         1,027,000

                    2. S.A.C. Capital Management, LLC
                    (a) Amount beneficially owned: 1,027,000
                    (b) Percent of class: 3.4%
                    (c)(i) Sole power to vote or direct the vote: -0-
                    (ii) Shared power to vote or direct the vote: 1,027,000
                    (iii) Sole power to dispose or direct the disposition: -0-
                    (iv) Shared power to dispose or direct the disposition:
                         1,027,000

                    3. CR Intrinsic Investors, LLC
                    (a) Amount beneficially owned: 1,530,000
                    (b) Percent of class: 5.0%
                    (c)(i) Sole power to vote or direct the vote: -0-
                    (ii) Shared power to vote or direct the vote: 1,530,000
                    (iii) Sole power to dispose or direct the disposition: -0-
                    (iv) Shared power to dispose or direct the disposition:
                         1,530,000

                    4. CR Intrinsic Investments, LLC
                    (a) Amount beneficially owned: 1,530,000

                                  Page 8 of 11



                    (b) Percent of class: 5.0%
                    (c)(i) Sole power to vote or direct the vote: -0-
                    (ii) Shared power to vote or direct the vote: 1,530,000
                    (iii) Sole power to dispose or direct the disposition: -0-
                    (iv) Shared power to dispose or direct the disposition:
                         1,530,000

                    5. Steven A. Cohen
                    (a) Amount beneficially owned: 2,557,000
                    (b) Percent of class: 8.4%
                    (c)(i) Sole power to vote or direct the vote: -0-
                    (ii) Shared power to vote or direct the vote: 2,557,000
                    (iii) Sole power to dispose or direct the disposition: -0-
                    (iv) Shared power to dispose or direct the disposition:
                         2,557,000

                    SAC Capital Advisors, SAC Capital Management, CR Intrinsic
                    Investors and Mr. Cohen do not directly own any Shares.
                    Pursuant to investment management agreements, each of SAC
                    Capital Advisors and SAC Capital Management share all
                    investment and voting power with respect to the securities
                    held by SAC Capital Associates and SAC Select Fund. Pursuant
                    to an investment management agreement, CR Intrinsic
                    Investors maintains investment and voting power with respect
                    to the securities held by CR Intrinsic Investments. Mr.
                    Cohen controls each of SAC Capital Advisors, SAC Capital
                    Management and CR Intrinsic Investors. CR Intrinsic
                    Investments is a wholly owned subsidiary of SAC Capital
                    Associates. By reason of the provisions of Rule 13d-3 of the
                    Securities Exchange Act of 1934, as amended, each of (i) SAC
                    Capital Advisors, SAC Capital Management and Mr. Cohen may
                    be deemed to own beneficially 1,027,000 Shares (representing
                    approximately 3.4% of the Shares outstanding) and (ii) CR
                    Intrinsic Investors and Mr. Cohen may be deemed to own
                    beneficially 1,530,000 Shares (representing approximately
                    5.0% of the Shares outstanding). Each of SAC Capital
                    Advisors, SAC Capital Management, CR Intrinsic Investors and
                    Mr. Cohen disclaim beneficial ownership of any of the
                    securities covered by this statement, and SAC Capital
                    Associates disclaims beneficial ownership of any securities
                    held by CR Intrinsic Investments.

Item 5              Ownership of Five Percent or Less of a Class:
                    --------------------------------------------

                    If this statement is being filed to report the fact that as
                    of the date hereof the reporting person has ceased to be the
                    beneficial owner of more than five percent of the class of
                    securities, check the following.   [ ]

                                  Page 9 of 11



Item 6              Ownership of More than Five Percent on Behalf of Another
                    --------------------------------------------------------
                    Person:
                    ------

                    Not Applicable

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:
                    ------------

                    Not Applicable

Item 9              Notice of Dissolution of Group:
                    ------------------------------

                    Not Applicable

Item 10             Certification:
                    -------------

         By signing below the signatory certifies that, to the best of his
knowledge and belief, the securities referred to above were not acquired and are
not held for the purpose of or with the effect of changing or influencing the
control of the issuer of the securities and were not acquired and are not held
in connection with or as a participant in any transaction having that purpose or
effect.

                                 Page 10 of 11




                                    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.

Dated:  February 14, 2008

S.A.C. CAPITAL ADVISORS, LLC


By:     /s/ Peter Nussbaum
        ------------------------------------
Name:   Peter Nussbaum
Title:  Authorized Person


S.A.C. CAPITAL MANAGEMENT, LLC


By:     /s/ Peter Nussbaum
        ------------------------------------
Name:   Peter Nussbaum
Title:  Authorized Person


CR INTRINSIC INVESTORS, LLC


By:     /s/ Peter Nussbaum
        ------------------------------------
Name:   Peter Nussbaum
Title:  Authorized Person

CR INTRINSIC INVESTMENTS, LLC


By:     /s/ Peter Nussbaum
        ------------------------------------
Name:   Peter Nussbaum
Title:  Authorized Person


STEVEN A. COHEN


By:     /s/ Peter Nussbaum
        ------------------------------------
Name:   Peter Nussbaum
Title:  Authorized Person

                                 Page 11 of 11