Filing Details

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* Radius Health, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 750469207 (CUSIP Number) December 31, 2016 (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 6 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 DelawareNUMBER 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 09. 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) PNCUSIP No. 750469207 13G Page 3 of 6 Pages1. 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 Delaware9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,643,001 10. CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (see instructions) ? 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 3.81% ( ) 12. TYPE OF REPORTING PERSON (see instructions) PNCUSIP No. 750469207 13G Page 4 of 6 PagesItem 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 Bain Capital Public Equity Management, LLC, a Delaware limited liability company ("BCPE Management"); and (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 BCPE Management. The Reporting Persons have entered into a Joint Filing Agreement, dated February 14, 2017, 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.(c) Citizenship Each of the Partners Fund, Trading Fund, Brookside Investors, Brookside Investors II and BCPE 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);(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: 1,761,719(b) Percent of class: 4.08% based upon 43,111,707 shares of Common Stock outstanding.(c) Number of shares as to which the person has: 1,761,719.(i) Sole power to vote or to direct the vote: 1,761,719.(ii) Shared power to vote or to direct the vote: 0.(iii) Sole power to dispose or to direct the disposition of: 1,761,719.(iv) Shared power to dispose or to direct the disposition of: 0.Item 5. Ownership of Five Percent or Less of a Class. If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following: ? 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.CUSIP No. 750469207 13G Page 6 of 6 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: February 14, 2017 BROOKSIDE CAPITAL PARTNERS FUND, L.P. By: Brookside Capital Investors, L.P., its general partner By: Bain Capital Public Equity Management, LLC, its general partner By: Name: Title: BROOKSIDE CAPITAL TRADING FUND, L.P. By: Brookside Capital Investors II, L.P., its general partner By: Bain Capital Public Equity Management, LLC, its general partner By: Name: Title: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 b e 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: February 14, 2017 BROOKSIDE CAPITAL PARTNERS FUND, L.P. By: Brookside Capital Investors, L.P., its general partner By: Bain Capital Public Equity Management, LLC, its general partner By: Name: Title: BROOKSIDE CAPITAL TRADING FUND, L.P. By: Brookside Capital Investors II, L.P., its general partner By: Bain Capital Public Equity Management, LLC, its general partner By: Name: Title: 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 43,111,707 shares of Common Stock outstanding as reported in the Issuer's Quarterly Report on Form 10-Q filed November 3 2016. The percentage of Common Stock reported owned by the Reporting Persons is based upon 43,111,707 shares of Common Stock outstanding as reported in the Issuer's Quarterly Report on Form 10-Q filed November 3, 2016.