Ownership Submission
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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  ADAGE CAPITAL PARTNERS GP LLC
 2. Date of Event Requiring Statement (Month/Day/Year)
03/03/2009		 3. Issuer Name and Ticker or Trading Symbol
AMAG PHARMACEUTICALS INC. [AMAG]
(Last)
(First)
(Middle)
200 CLARENDON STREET, 52ND FLOOR		 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 Original Filed(Month/Day/Year)
(Street)

BOSTON, MA 02116		 6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
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)
Common Stock, par value $.01 per share ("Common Stock") 1,914,123
I
See FN (1)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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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 of Derivative Security: 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
Equity Swap (obligation to buy) (2) 12/08/2008 06/09/2009 Common Stock 100,000 $ 34.839 I See FNs (1) (2)
Equity Swap (obligation to buy) (3) 12/08/2008 06/09/2009 Common Stock 477,324 $ 45.2099 I See FNs (1) (3)

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
ADAGE CAPITAL PARTNERS GP LLC
200 CLARENDON STREET
52ND FLOOR
BOSTON, MA 02116		     X    
ADAGE CAPITAL PARTNERS LP
200 CLARENDON STREET
52ND FLOOR
BOSTON, MA 02116		     X    
Adage Capital Advisors, L.L.C.
200 CLARENDON STREET
52ND FLOOR
BOSTON, MA 02116		     X    
Atchinson Robert
200 CLARENDON STREET
52ND FLOOR
BOSTON, MA 02116		     X    
Gross Phillip
200 CLARENDON STREET
52ND FLOOR
BOSTON, MA 02116		     X    

Signatures

/s/ Robert Atchinson 03/06/2009
**Signature of Reporting Person Date
/s/ Adage Capital Partners, L.P.; By its general partner Adage Capital Partners GP, L.L.C.; By its managing member Adage Capital Advisors, L.L.C.; By its managing member Robert Atchinson 03/06/2009
**Signature of Reporting Person Date
/s/ Adage Capital Partners GP, L.L.C.; By its managing member Adage Capital Advisors, L.L.C.; By its managing member Robert Atchinson 03/06/2009
**Signature of Reporting Person Date
/s/ Adage Capital Advisors, L.L.C.; By its managing member Robert Atchinson 03/06/2009
**Signature of Reporting Person Date
/s/ Phillip Gross 03/06/2009
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) The Shares of Common Stock and Equity Swaps to which this note relates are held directly by Adage Capital Partners, L.P., a Delaware limited partnership (the "Fund"). Adage Capital Partners GP, L.L.C., a Delaware limited liability company ("ACPGP"), serves as the general partner of the Fund and as such has discretion over the portfolio securities beneficially owned by the Fund. Adage Capital Advisors, L.L.C., a Delaware limited liability company ("ACA"), is the managing member of ACPGP and directs ACPGP's operations. Robert Atchinson and Phillip Gross are the managing members of ACPGP and ACA and general partners of ACP. ACPGP, ACA, Robert Atchinson and Phillip Gross disclaim beneficial ownership of the reported securities except to the extent of their pecuniary interest therein.
(2) On December 8, 2008, the Fund entered into an equity swap agreement with a securities broker under which, upon expiration of the six-month term of the agreement, (i) the Fund will be obligated to pay the broker $34.839 per share for each share of Common Stock that is subject to the agreement, and (ii) the broker will be obligated to pay the Fund the volume weighted average market price of 100,000 shares of Common Stock, as of the end of the six month period.
(3) On December 8, 2008, the Fund entered into an equity swap agreement with a securities broker under which, upon expiration of the six-month term of the agreement, (i) the Fund will be obligated to pay the broker $45.2099 per share for each share of Common Stock that is subject to the agreement, and (ii) the broker will be obligated to pay the Fund the volume weighted average market price of 477,324 shares of Common Stock, as of the end of the six month period.

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