Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN 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 *
Harvey Brian Nicholas
   2. Issuer Name and Ticker or Trading Symbol
Radius Health, Inc. [NONE] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Sr VP & CFO, Sec. & Treasurer
(Last)
(First)
(Middle)
C/O RADIUS HEALTH, INC. 201 BROADWAY, 6TH FLOOR		 3. Date of Earliest Transaction (Month/Day/Year)
05/17/2011
(Street)

CAMBRIDGE, MA 02139		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 05/17/2011   A   30,000 A (1) 30,000 D  

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (Right to Buy) $ 0.9 05/17/2011   A   53,389     (2) 07/12/2017 Common Stock 53,389 (3) 53,389 D  
Stock Option (Right to Buy) $ 1.2 05/17/2011   A   63,335     (4) 05/08/2018 Common Stock 63,335 (5) 63,335 D  
Stock Option (Right to Buy) $ 1.2 05/17/2011   A   26,992     (6) 12/03/2018 Common Stock 26,992 (7) 26,992 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Harvey Brian Nicholas
C/O RADIUS HEALTH, INC. 201 BROADWAY
6TH FLOOR
CAMBRIDGE, MA 02139		       Sr VP & CFO, Sec. & Treasurer  

Signatures

 /s/ B. Nicholas Harvey   05/19/2011
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(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) Received in exchange for 30,000 shares of common stock of Radius Health, Inc. in connection with the merger of RHI Merger Corp., a wholly-owned subsidiary of the Registrant (f/k/a MPM Acquisition Corp.), with and into Radius Health, Inc. ("Target") pursuant to which Target survived and became a wholly-owned subsidiary of Registrant (the "Surviving Corporation"). Following such merger, the Surviving Corporation merged with and into its parent corporation, the Registrant, and subsequently changed its name to "Radius Health, Inc." (the "Merger").
(2) Twenty-five percent of the options vested on December 1, 2007, twenty-five percent of the options vest in twelve equal quarterly installments with the first quarterly installment vesting on January 1, 2008, and the remaining 50% vest upon the completion of certain milestones.
(3) Received in exchange for employee stock options to acquire 53,389 shares of Radius Health, Inc. common stock for $0.90 per share in connection with the Merger.
(4) 47,501 of the options vested on May 8, 2008, and the remaining options vest in twelve equal quarterly installments with the first quarterly installment vesting on October 1, 2008.
(5) Received in exchange for employee stock options to acquire 63,335 shares of Radius Health, Inc. common stock for $1.20 per share in connection with the Merger.
(6) The options vest in sixteen equal quarterly installments with the first quarterly installment vesting on January 1, 2009.
(7) Received in exchange for employee stock options to acquire 26,992 shares of Radius Health, Inc. common stock for $1.20 per share in connection with the Merger.

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