13G Filing: Tourbillon Capital Partners and Radius Health, Inc. (RDUS)

1.

NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

Tourbillon Capital Partners, L.P.

2.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

(a)    [x]

(b)    [ ]

3.

SEC USE ONLY

4.

CITIZENSHIP OR PLACE OF ORGANIZATION

Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

5.

SOLE VOTING POWER

0

6.

SHARED VOTING POWER

2,333,876

7.

SOLE DISPOSITIVE POWER

0

8.

SHARED DISPOSITIVE POWER

2,333,876

9.

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

2,333,876

10.

CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
EXCLUDES CERTAIN SHARES    [ ]

11.

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

5.4%

12.

TYPE OF REPORTING PERSON

PN, IA