SEC FORM 3

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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^*

MPM BioVentures IV LLC

(Last)

(First)

(Middle)

C/O MPM ASSET MANAGEMENT

200 CLARENDON ST., 54TH FLOOR

(Street)

BOSTON

02116

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
05/17/2011

3. Issuer Name and Ticker or Trading Symbol
Radius Health, Inc. [ NONE ]

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)

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)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	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)
Series A-1 Convertible Preferred Stock	⁽¹⁾	⁽¹⁾	Common Stock	540,010	⁽¹⁾	I	See footnote⁽²⁾
Series A-2 Convertible Preferred Stock	⁽¹⁾	⁽¹⁾	Common Stock	1,842,420	⁽¹⁾	I	See footnote⁽²⁾

1. Name and Address of Reporting Person^*

MPM BioVentures IV LLC

(Last)

(First)

(Middle)

C/O MPM ASSET MANAGEMENT

200 CLARENDON ST., 54TH FLOOR

(Street)

BOSTON

02116

(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^*

MPM BioVentures IV GP LLC

(Last)

(First)

(Middle)

C/O MPM ASSET MANAGEMENT

200 CLARENDON ST., 54TH FLOOR

(Street)

BOSTON

02116

(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^*

MPM Bio IV NVS Strategic Fund LP

(Last)

(First)

(Middle)

C/O MPM ASSET MANAGEMENT

200 CLARENDON ST., 54TH FLOOR

(Street)

BOSTON

02116

(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^*

DOMBKOWSKI ASHLEY L

(Last)

(First)

(Middle)

C/O MPM ASSET MANAGEMENT

601 GATEWAY BLVD., SUITE 350

(Street)

SOUTH SAN FRANCISCO

94080

(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^*

Greene William

(Last)

(First)

(Middle)

C/O MPM ASSET MANAGEMENT

601 GATEWAY BLVD., SUITE 350

(Street)

SOUTH SAN FRANCISCO

94080

(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^*

KAILIAN VAUGHN M

(Last)

(First)

(Middle)

C/O MPM ASSET MANAGEMENT

200 CLARENDON ST., 54TH FLOOR

(Street)

BOSTON

02116

(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^*

Scopa James Paul

(Last)

(First)

(Middle)

C/O MPM ASSET MANAGEMENT

601 GATEWAY BLVD., SUITE 350

(Street)

SOUTH SAN FRANCISCO

94080

(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^*

St Peter Steven

(Last)

(First)

(Middle)

C/O MPM ASSET MANAGEMENT

200 CLARENDON ST., 54TH FLOOR

(Street)

BOSTON

02116

(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^*

Vander Vort John

(Last)

(First)

(Middle)

C/O MPM ASSET MANAGEMENT

200 CLARENDON ST., 54TH FLOOR

(Street)

BOSTON

02116

(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. Each share of Series A-1 Convertible Preferred Stock and Series A-2 Convertible Preferred Stock (collectively, the "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 ratio of 10 shares of Common Stock for every 1 share of Preferred Stock.

2. The shares are held by MPM Bio IV NVS Strategic Fund, L.P. ("MPM NVS"). MPM BioVentures IV GP LLC ("BV IV GP LLC") and MPM BioVentures IV LLC ("BV IV LLC") are the direct and indirect general partners of MPM NVS. Luke Evnin, Ansbert Gadicke, Ashley L. Dombkowski, Willliam Greene, Vaughn M. Kailian, James Paul Scopa, Steven St. Peter and John Vander Vort are the members of MPM NVS. Each reporting person disclaims beneficial ownership of the securities reported herein except to the extent of his, her or its respective pecuniary interest therein.

	/s/ Luke Evnin, Member of MPM BioVentures IV LLC	05/19/2011
	/s/ Luke Evnin, Member of MPM BioVentures IV LLC, the general partner of MPM BioVentures IV GP LLC	05/19/2011
	/s/ Luke Evnin, Member of MPM BioVentures IV LLC, the general partner of MPM BioVentures IV GP LLC, the general partner of MPM Bio IV NVS Strategic Fund. L.P.	05/19/2011
	/s/ Ashley L. Dombkowski	05/19/2011
	/s/ William Greene	05/19/2011
	/s/ Vaughn M. Kailian	05/19/2011
	/s/ James Paul Scopa	05/19/2011
	/s/ Steven St. Peter	05/19/2011
	/s/ John Vander Vort	05/19/2011
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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