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


                                  SCHEDULE 13G

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

                              ALTRA HOLDINGS, INC.
--------------------------------------------------------------------------------
                                (Name of Issuer)

                     Common Stock, $.001 Par Value Per Share
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    02208R106
                                    ---------
                                 (CUSIP Number)

                                  June 20, 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 12





-------------------                                           ------------------
CUSIP No. 02208R106                   13G                     Page 2 of 12 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
NUMBER OF             ----- ----------------------------------------------------
SHARES                   6  SHARED VOTING POWER
BENEFICIALLY
OWNED                       1,377,220 (see Item 4)
BY                    ----- ----------------------------------------------------
EACH                     7  SOLE DISPOSITIVE POWER
REPORTING
PERSON                      0
WITH                  ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            1,377,220 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,377,220 (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)

           5.5% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------

                       *SEE INSTRUCTION BEFORE FILLING OUT


                                  Page 2 of 12





-------------------                                           ------------------
CUSIP No. 02208R106                   13G                     Page 3 of 12 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
NUMBER OF             ----- ----------------------------------------------------
SHARES                   6  SHARED VOTING POWER
BENEFICIALLY
OWNED                       1,377,220 (see Item 4)
BY                    ----- ----------------------------------------------------
EACH                     7  SOLE DISPOSITIVE POWER
REPORTING
PERSON                      0
WITH                  ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            1,377,220 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,377,220 (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)

           5.5% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------

                       *SEE INSTRUCTION BEFORE FILLING OUT


                                  Page 3 of 12





-------------------                                           ------------------
CUSIP No. 02208R106                   13G                     Page 4 of 12 Pages
-------------------                                           ------------------

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

           S.A.C. Capital Associates, 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
NUMBER OF             ----- ----------------------------------------------------
SHARES                   6  SHARED VOTING POWER
BENEFICIALLY
OWNED                       1,375,000 (see Item 4)
BY                    ----- ----------------------------------------------------
EACH                     7  SOLE DISPOSITIVE POWER
REPORTING
PERSON                      0
WITH                  ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            1,375,000 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,375,000 (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)

           5.5% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------

                       *SEE INSTRUCTION BEFORE FILLING OUT


                                  Page 4 of 12





-------------------                                           ------------------
CUSIP No. 02208R106                   13G                     Page 5 of 12 Pages
-------------------                                           ------------------

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

           Sigma 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
NUMBER OF             ----- ----------------------------------------------------
SHARES                   6  SHARED VOTING POWER
BENEFICIALLY
OWNED                       101,000 (see Item 4)
BY                    ----- ----------------------------------------------------
EACH                     7  SOLE DISPOSITIVE POWER
REPORTING
PERSON                      0
WITH                  ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            101,000 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           101,000 (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)

           0.4% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------

                       *SEE INSTRUCTION BEFORE FILLING OUT


                                  Page 5 of 12





-------------------                                           ------------------
CUSIP No. 02208R106                   13G                     Page 6 of 12 Pages
-------------------                                           ------------------

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

           Canvas Capital Management, LP
---------- ---------------------------------------------------------------------
        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
NUMBER OF             ----- ----------------------------------------------------
SHARES                   6  SHARED VOTING POWER
BENEFICIALLY
OWNED                       361,500 (see Item 4)
BY                    ----- ----------------------------------------------------
EACH                     7  SOLE DISPOSITIVE POWER
REPORTING
PERSON                      0
WITH                  ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            361,500 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           361,500 (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)

           1.5% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           00
---------- ---------------------------------------------------------------------

                       *SEE INSTRUCTION BEFORE FILLING OUT


                                  Page 6 of 12





-------------------                                           ------------------
CUSIP No. 02208R106                   13G                     Page 7 of 12 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
NUMBER OF             ----- ----------------------------------------------------
SHARES                   6  SHARED VOTING POWER
BENEFICIALLY
OWNED                       1,839,720 (see Item 4)
BY                    ----- ----------------------------------------------------
EACH                     7  SOLE DISPOSITIVE POWER
REPORTING
PERSON                      0
WITH                  ----- ----------------------------------------------------
                         8  SHARED DISPOSITIVE POWER

                            1,839,720 (see Item 4)
---------- ---------------------------------------------------------------------
        9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,839,720 (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)

           7.4% (see Item 4)
---------- ---------------------------------------------------------------------
       12  TYPE OF REPORTING PERSON*

           IN
---------- ---------------------------------------------------------------------

                       *SEE INSTRUCTION BEFORE FILLING OUT


                                  Page 7 of 12





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

                    Altra Holdings, Inc.

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

                    14 Hayward Street, Quincy, Massachusetts 02171

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, $.001 par value per share ("Shares"), of the
                    Issuer beneficially owned by S.A.C. Capital Associates, LLC
                    ("SAC Capital Associates") and S.A.C. MultiQuant Fund, LLC
                    ("SAC MultiQuant"); (ii) S.A.C. Capital Management, LLC,
                    ("SAC Capital Management") with respect to Shares
                    beneficially owned by SAC Capital Associates and SAC
                    MultiQuant; (iii) SAC Capital Associates with respect to
                    Shares beneficially owned by it; (iv) Sigma Capital
                    Management, LLC ("Sigma Capital Management") with respect to
                    Shares beneficially owned by Sigma Capital Associates, LLC
                    ("Sigma Capital Associates"); (v) Canvas Capital Management,
                    LP ("Canvas Capital Management") with respect to Shares
                    beneficially owned by Canvas Capital Associates, LLC
                    ("Canvas Capital Associates"); and (vi) Steven A. Cohen with
                    respect to Shares beneficially owned by SAC Capital
                    Advisors, SAC Capital Management, SAC Capital Associates,
                    SAC MultiQuant, Sigma Capital Management, Sigma Capital
                    Associates, Canvas Capital Management and Canvas Capital
                    Associates.

                    SAC Capital Advisors, SAC Capital Management, SAC Capital
                    Associates, Sigma Capital Management, Canvas Capital
                    Management 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 and Mr. Cohen is 72 Cummings Point Road,
                    Stamford, Connecticut 06902, (ii) SAC Capital Management and
                    Sigma Capital Management is 540 Madison Avenue, New York,
                    New York 10022, (iii) Canvas Capital Management is 101
                    California Street, Suite 4225, San Francisco, California
                    94111 and (iv) SAC Capital Associates is P.O. Box 58,
                    Victoria House, The Valley, Anguilla, British West Indies.


                                  Page 8 of 12





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

                    SAC Capital Advisors, SAC Capital Management and Sigma
                    Capital Management are Delaware limited liability companies.
                    Canvas Capital Management is a Delaware limited partnership.
                    SAC Capital Associates is an Anguillan limited liability
                    company. Mr. Cohen is a United States citizen.

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

                    Common Stock, $.001 par value per share

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

                    02208R106

Item 3              Not Applicable

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

                    The percentages used herein are calculated based upon the
                    Shares issued and outstanding as reported on the Issuer's
                    prospectus on Form 424B4 filed on June 20, 2007.

                    As of the close of business on June 20, 2007:

                    1. S.A.C. Capital Advisors, LLC
                    (a) Amount beneficially owned: 1,377,220
                    (b) Percent of class: 5.5%
                    (c) (i) Sole power to vote or direct the vote: -0-
                    (ii) Shared power to vote or direct the vote: 1,377,220
                    (iii) Sole power to dispose or direct the disposition: -0-
                    (iv) Shared power to dispose or direct the disposition:
                    1,377,220

                    2. S.A.C. Capital Management, LLC
                    (a) Amount beneficially owned: 1,377,220
                    (b) Percent of class: 5.5%
                    (c) (i) Sole power to vote or direct the vote: -0-
                    (ii) Shared power to vote or direct the vote: 1,377,220
                    (iii) Sole power to dispose or direct the disposition: -0-
                    (iv) Shared power to dispose or direct the disposition:
                    1,377,220

                    3. S.A.C. Capital Associates, LLC
                    (a) Amount beneficially owned: 1,375,000
                    (b) Percentage of class: 5.5%
                    (c) (i) Sole power to vote or direct the vote:-0-
                    (ii) Shared power to vote or direct the vote: 1,375,000
                    (iii) Sole power to dispose or direct the disposition: -0-


                                  Page 9 of 12





                    (iv) Shared power to dispose or direct the disposition:
                    1,375,000

                    4. Sigma Capital Management, LLC
                    (a) Amount beneficially owned: 101,000
                    (b) Percentage of class: 0.4%
                    (c) (i) Sole power to vote or direct the vote:-0-
                    (ii) Shared power to vote or direct the vote: 101,000
                    (iii) Sole power to dispose or direct the disposition: -0-
                    (iv) Shared power to dispose or direct the disposition:
                    101,000

                    5. Canvas Capital Management, LP
                    (a) Amount beneficially owned: 361,500
                    (b) Percent of class: 1.5%
                    (c) (i) Sole power to vote or direct the vote: -0-
                    (ii) Shared power to vote or direct the vote: 361,500
                    (iii) Sole power to dispose or direct the disposition: -0-
                    (iv) Shared power to dispose or direct the disposition:
                    361,500

                    6. Steven A. Cohen
                    (a) Amount beneficially owned: 1,839,720
                    (b) Percent of class: 7.4%
                    (c) (i) Sole power to vote or direct the vote: -0-
                    (ii) Shared power to vote or direct the vote: 1,839,720
                    (iii) Sole power to dispose or direct the disposition: -0-
                    (iv) Shared power to dispose or direct the disposition:
                    1,839,720

                    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 MultiQuant. Pursuant
                    to an investment management agreement, Sigma Capital
                    Management maintains investment and voting power with
                    respect to the securities held by Sigma Capital Associates.
                    Pursuant to Canvas Capital Associates' operating agreement,
                    Canvas Capital Management maintains investment and voting
                    power with respect to the securities held by Canvas Capital
                    Associates. Mr. Cohen controls each of SAC Capital Advisors,
                    SAC Capital Management, Sigma Capital Management and Canvas
                    Capital Management. Each of SAC Capital Advisors, SAC
                    Capital Management, Sigma Capital Management, Canvas Capital
                    Management and Mr. Cohen disclaim beneficial ownership of
                    any of the securities covered by this statement.


                                 Page 10 of 12





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. [ ]

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 11 of 12





                                    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:  June 25, 2007

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


S.A.C. CAPITAL ASSOCIATES, LLC

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


SIGMA CAPITAL MANAGEMENT, LLC


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


CANVAS CAPITAL MANAGEMENT, LP

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

STEVEN A. COHEN

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


                                 Page 12 of 12