SEC Form 3

FORM 3

UNITED STATES 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 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* CAISSE DE DEPOT ET PLACEMENT DU QUEBEC (Last) (First) (Middle) 1000 PLACE JEAN-PAUL RIOPELLE (Street) MONTREAL A8 H2Z 2B3 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 12/14/2006	3. Issuer Name and Ticker or Trading Symbol Altra Holdings, Inc. [ AIMC ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) Director X 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) Form filed by One Reporting Person X Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Preferred Stock	7,000,000(1)	D(2)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person* CAISSE DE DEPOT ET PLACEMENT DU QUEBEC (Last) (First) (Middle) 1000 PLACE JEAN-PAUL RIOPELLE (Street) MONTREAL A8 H2Z 2B3 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* HOULE LUC (Last) (First) (Middle) 1000 PLACE JEAN-PAUL RIOPELLE (Street) MONTREAL A8 H2Z 2B3 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* LALONDE LOUISE (Last) (First) (Middle) 1000 PLACE JEAN-PAUL RIOPELLE (Street) MONTREAL A8 H2Z 2B3 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

Explanation of Responses:

1. Upon the closing of the initial public offering of the Issuer's Common Stock, all outstanding shares of Preferred Stock will be automatically converted into shares of the Issuer's Common Stock on a one share of Common Stock for every two shares of Preferred Stock outstanding basis.

2. Because Louise Lalonde and Luc Houle exercise voting and investment control over the shares of Altra Holdings, Inc. held by Caisse de Depot et Placement du Quebec, they may be deemed to be the beneficial owners of shares deemed to be beneficially owned by such entity. Each of Louise Lalonde and Luc Houle disclaim beneficial ownership of these shares, except to the extent of any pecuniary interest therein. Exhibit List: Exhibit 24 - Power of Attorney; Exhibit 99- Joint Filer Information

	/s/ Paule Gaumond, Attorney-In-Fact for Caisse de Depot et Placement du Quebec, Louise Lalonde and Luc Houle	12/14/2006
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* 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).
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