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 *
Muenchbach Martin
   2. Issuer Name and Ticker or Trading Symbol
Radius Health, Inc. [NONE] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O RADIUS HEALTH, INC., 201 BROADWAY, 6TH FLOOR		 3. Date of Earliest Transaction (Month/Day/Year)
04/23/2013
(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

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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
Series B Convertible Preferred Stock (1) 04/23/2013   A   32,563   04/23/2013   (1) Common Stock 325,630 $ 61.42 (2) 32,563 I By Fund (3)
Common Stock Warrant $ 6.142 04/23/2013   A   81,408   04/23/2013 04/23/2018 Common Stock 81,408 (2) 81,408 I By Fund (3)

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Muenchbach Martin
C/O RADIUS HEALTH, INC.
201 BROADWAY, 6TH FLOOR
CAMBRIDGE, MA 02139		   X      

Signatures

 /s/ B. Nicholas Harvey, attorney-in-fact   04/24/2013
**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) Each share of the Series B Convertible Preferred Stock has no expiration date and is convertible at any time, in whole or in part, at the election of the holder at a conversion rate of 10 shares of Common Stock for every 1 share of Series B Convertible Preferred Stock..
(2) Payment of an aggregate purchase price equal to the product of (i) $61.42 multiplied by (ii) the total number of reported shares of Series B Convertible Preferred Stock, entitled the purchaser to receive the reported shares of Series B Convertible Preferred Stock as well as the reported warrant exercisable for shares of Common Stock.
(3) The reported securities are owned directly by BB Biotech Ventures II L.P. ("BBBV LP"). BB Biotech Ventures GP (Guernsey) Limited ("BBBV Limited") is the General Partner of BBBV LP. The reporting person is a Senior Investment Advisor Private Equity at Bellevue Asset Management AG ("BAM AG") and advises Asset Management BAB N.V. ("AMB NV") who, pursuant to a services agreement with BAM AG, advises the directors of BBBV Limited. The reporting person shares voting and investment power over the BBBV LP shares. The reporting person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein.

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