UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. ________)*
Radius Health, Inc. (Name of Issuer)
Common Stock
(Title of Class of Securities)
750469207 (CUSIP Number)
October 19, 2015
(Date of Event which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant
 to which this Schedule is filed:
?   Rule 13d-1(b)
?	Rule 13d-1(c)
?   Rule 13d-1(d)
* The remainder of this cover page shall be filled out for a
reporting person's initial filing on this form with respect to the subject
class of securities, and for any subsequent amendment containing information
 which would alter disclosures provided in a prior cover page.
The information required on the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of
the Securities Exchange Act of 1934 ("Act") or otherwise subject to the
liabilities of that section of the Act but shall be subject to
all other provisions of the Act (however, see the Notes).

CUSIP No. 750469207


13G

Page 2 of 7 Pages











1.

NAMES OF REPORTING PERSONS

Brookside Capital Partners Fund, L.P.


2.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(see instructions)
(a)    ?
(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

118,718 ( )


6.

SHARED VOTING POWER

0


7.

SOLE DISPOSITIVE POWER

118,718 (1)


8.

SHARED DISPOSITIVE POWER

0






9.

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

118,718 (1)


10.

CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
(see instructions)    ?


11.

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

0.28% ( )


12.

TYPE OF REPORTING PERSON (see instructions)

PN













CUSIP No. 750469207


13G

Page 3 of 7 Pages











1.

NAMES OF REPORTING PERSONS

Brookside Capital Trading Fund, L.P.


2.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(see instructions)
(a)    ?
(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

1,967,277


6.

SHARED VOTING POWER

0


7.

SOLE DISPOSITIVE POWER

1,967,277


8.

SHARED DISPOSITIVE POWER

0






9.

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,967,277


10.

CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
(see instructions)    ?


11.

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

4.60% ( )


12.

TYPE OF REPORTING PERSON (see instructions)

PN













CUSIP No. 750469207


13G

Page 4 of 7 Pages











1.

NAMES OF REPORTING PERSONS

Brookside Capital Partners Fund III, L.P.


2.

CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
(see instructions)
(a)    ?
(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

57,352


6.

SHARED VOTING POWER

0


7.

SOLE DISPOSITIVE POWER

57,352


8.

SHARED DISPOSITIVE POWER

0






9.

AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

57,352


10.

CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
(see instructions)    ?


11.

PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

0.13% ( )


12.

TYPE OF REPORTING PERSON (see instructions)

PN













CUSIP No. 750469207

13G

Page 5 of 7 Pages





Item 1.

(a)
Name of Issuer
The name of the issuer to which this filing on Schedule 13G relates
 is Radius Health, Inc. (the "Company")




(b)
Address of Issuer's Principal Executive Offices
The principal executive offices of the Company are located at 950 Winter
 Street, Waltham, MA 02451.



Item 2.

(a)
Name of Person Filing
This Statement is being filed on behalf the following (collectively, the
 "Reporting Persons"): (1) Brookside Capital Partners Fund, L.P., a
Delaware limited partnership ("Partners Fund"), whose sole general partner
 is Brookside Capital Investors, L.P., a Delaware limited partnership
("Brookside Investors"), whose sole general partner is Brookside
Capital Management, LLC, a Delaware limited liability company
("Brookside Management"); (2) Brookside Capital
Trading Fund, L.P., a Delaware limited partnership ("Trading Fund"),
whose sole general partner is Brookside Capital
Investors II, L.P., a Delaware limited partnership ("Brookside Investors
II"), whose sole general partner is Brookside
Management; and (3) Brookside Capital Partners Fund III, L.P., a Delaware
limited partnership ("Partners Fund III"),
whose sole general partner is Brookside Capital Investors III, L.P., a
 Delaware limited partnership ("Brookside
Investors III"), whose sole general partner is Brookside Management.

The Reporting Persons have entered into a Joint Filing Agreement, dated
October 22, 2015, a copy of which is filed
with this Schedule 13G as Exhibit A, pursuant to which the Reporting Persons
 have agreed to file this statement jointly
in accordance with the provisions of Rule 13d-1(k)(1) under the
Securities Exchange Act of 1934.




(b)
Address of the Principal Office or, if none, residence
The principal business address of each of the Partners Fund, the Trading
Fund, Partners Fund III, Brookside Investors,
Brookside Investors II, Brookside Investors III and Brookside Management
is c/o Brookside Capital, LLC, John
Hancock Tower, 200 Clarendon Street, Boston, MA 02116.




(c)
Citizenship
Each of the Partners Fund, Trading Fund, Partners Fund III, Brookside
Investors, Brookside Investors II, Brookside
Investors III and Brookside Management is organized under the laws of
the State of Delaware.




(d)
Title of Class of Securities
The class of equity securities of the Company to which this filing on
Schedule 13G relates is Common Stock
("Common Stock").




(e)
CUSIP Number
The CUSIP number of the Company's Common Stock is 750469207.



Item 3.  If this statement is filed pursuant to 240.13d-1(b) or
240.13d-2(b) or (c), check whether the person filing is a:

(a)
?
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).





(b)
?
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).





(c)
?
Insurance company as defined in section 3(a)(19) of the Act
(15 U.S.C. 78c).





(d)
?
Investment company registered under section 8 of the Investment Company
Act of 1940 (15 U.S.C. 80a-8).





(e)
?
An investment adviser in accordance with 240.13d-1(b)(1)(ii)(E);





(f)
?
An employee benefit plan or endowment fund in accordance with
240.13d-1(b)(1)(ii)(F);





(g)
?
A parent holding company or control person in accordance with
240.13d-1(b)(1)(ii)(G);





(h)
?
A savings associations as defined in Section 3(b) of the Federal
Deposit Insurance Act (12 U.S.C. 1813);





(i)
?
A church plan that is excluded from the definition of an
investment company under section 3(c)(14) of the
Investment Company Act of 1940 (15 U.S.C. 80a-3);





(j)
?
Group, in accordance with 240.13d-1(b)(1)(ii)(J).







[x]  If this statement is filed pursuant to 240.13d-1(c),
check this box.
Item 4.  Ownership.
Provide the following information regarding the aggregate
number and percentage of the class of securities of the issuer
identified in Item 1.






(a)

Amount beneficially owned:  2,143,347






(b)

Percent of class: 5.01% based upon 42,786,322 shares of
Common Stock outstanding.






(c)

Number of shares as to which the person has:  2,143,347.








(i)
Sole power to vote or to direct the vote:  2,143,347.








(ii)
Shared power to vote or to direct the vote:  0.








(iii)
Sole power to dispose or to direct the disposition of:  2,143,347.








(iv)
Shared power to dispose or to direct the disposition of:  0.





Item 5.  Ownership of Five Percent or Less of a Class.
Not applicable.
Item 6.  Ownership of More than Five Percent on
Behalf of Another Person.
 Not applicable.
Item 7.  Identification and Classification of the
Subsidiary Which Acquired the Security Being Reported on By the Parent
Holding Company.
Not applicable.
Item 8.  Identification and Classification of Members of the Group.
 Not applicable.
Item 9.  Notice of Dissolution of Group.
 Not applicable.
Item 10.  Certification.







By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and are
not held for the purpose of or with the effect of changing or
influencing the control of the issuer of the securities and were
not acquired and are not held in connection with or as a participant
 in any transaction having that purpose or effect.












CUSIP No. 750469207

13G

Page 7 of 7 Pages





    After reasonable inquiry and to the best of my knowledge and belief,
I certify that the information set forth in this statement
is true, complete and correct.
Dated: October 22, 2015

BROOKSIDE CAPITAL PARTNERS FUND, L.P.

                                    By: Brookside Capital Investors, L.P.,
                                    its general partner
                                    By: Brookside Capital Management, LLC,
                                    its general partner


By:
    Name: William E. Pappendick IV
    Title: Managing Director


BROOKSIDE CAPITAL TRADING FUND, L.P.

                                    By: Brookside Capital Investors II, L.P.,
        its general partner
                                    By: Brookside Capital Management, LLC,
                                    its general partner


        By:
    Name: William E. Pappendick IV
    Title: Managing Director



                                    BROOKSIDE CAPITAL PARTNERS FUND III, L.P.

                                    By: Brookside Capital Investors III, L.P.,
                                    its general partner
                                    By: Brookside Capital Management, LLC,
                                    its general partner


By:
    Name: William E. Pappendick IV
    Title: Managing Director







Exhibit A

AGREEMENT REGARDING THE JOINT FILING OF
SCHEDULE 13G


The undersigned hereby agree as follows:

(i) The Statement on Schedule 13G, and any amendments thereto, to which this
 Agreement is annexed as Exhibit A
is and will be filed on behalf of each of them in accordance with the
provisions of Rule 13d-1(k)(1) under the
Securities Exchange Act of 1934, as amended; and

(ii) Each of them is responsible for the timely filing of such Schedule 13G
and any amendments thereto, and for the
completeness and accuracy of the information concerning such person
 contained therein; but none of them is
responsible for the completeness or accuracy of the information concerning
the other persons making the filing,
unless such person knows or has reason to believe that such
information is inaccurate.

Dated:  October 22, 2015


                                BROOKSIDE CAPITAL PARTNERS FUND, L.P.

                        By: Brookside Capital Investors, L.P.,
                        its general partner
                        By: Brookside Capital Management, LLC,
                        its general partner


                                     	By:
                                    Name: William E. Pappendick IV
                                    Title: Managing Director

                                BROOKSIDE CAPITAL TRADING FUND, L.P.

                        By: Brookside Capital Investors II, L.P.,
                        its general partner
                        By: Brookside Capital Management, LLC,
                        its general partner


                                     	By:
                                    Name: William E. Pappendick IV
                                    Title: Managing Director

                                BROOKSIDE CAPITAL PARTNERS FUND III, L.P.

                        By: Brookside Capital Investors III, L.P.,
                        its general partner
                        By: Brookside Capital Management, LLC,
                        its general partner


                                     	By:
                                    Name: William E. Pappendick IV
                                    Title: Managing Director

  Includes 118,718 shares of Common Stock that may be issued upon the
exercise of warrants to purchase Common Stock owned
by Brookside Capital Partners Fund, L.P.
  The percentage of Common Stock reported owned by the Reporting Persons
 is based upon 42,786,322 shares of Common Stock
outstanding as reported in the Issuer's Form 10-Q dated August 6, 2015.
  The percentage of Common Stock reported owned by the Reporting Persons
is based upon 42,786,322 shares of Common Stock
outstanding as reported in the Issuer's Form 10-Q dated August 6, 2015.
  The percentage of Common Stock reported owned by the Reporting Persons
is based upon 42,786,322 shares of Common Stock
outstanding as reported in the Issuer's Form 10-Q dated August 6, 2015.




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