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
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

ADAGE CAPITAL PARTNERS GP LLC
2. Issuer Name and Ticker or Trading Symbol

HeartWare International, Inc. [ HTWR ]
5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      __ X __ 10% Owner
_____ Officer (give title below)      _____ Other (specify below)
(Last)          (First)          (Middle)

200 CLARENDON STREET, 52ND FLOOR, 
3. Date of Earliest Transaction (MM/DD/YYYY)

4/17/2015
(Street)

BOSTON, MA 02116
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
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 Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. 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
Common Stock, par value $0.001 ("Commn Stock")   4/17/2015     S    12500   D $80.95   1993736   I   See footnote   (1)
Common Stock   4/17/2015     S    6700   D $81.00   1987036   I   See footnote   (1)
Common Stock   4/17/2015     S    13245   D $83.49   1973791   I   See footnote   (1)
Common Stock   4/17/2015     S    9300   D $81.18   1964491   I   See footnote   (1)
Common Stock   4/17/2015     S    3900   D $82.01   1960591   I   See footnote   (1)
Common Stock   4/17/2015     S    5000   D $80.99   1955591   I   See footnote   (1)
Common Stock   4/17/2015     S    5000   D $80.84   1950591   I   See footnote   (1)
Common Stock   4/17/2015     S    7141   D $80.83   1943450   I   See footnote   (1)
Common Stock   4/20/2015     S    5000   D $80.50   1938450   I   See footnote   (1)
Common Stock   4/20/2015     S    7000   D $80.90   1931450   I   See footnote   (1)
Common Stock   4/20/2015     S    74134   D $80.05   1875316   I   See footnote   (1)
Common Stock   4/20/2015     S    2400   D $80.54   1854916   I   See footnote   (1)
Common Stock   4/21/2015     S    1800   D $80.61   1853116   I   See foonote   (1)
Common Stock   4/21/2015     S    700   D $80.53   1852416   I   See footnote   (1)
Common Stock   4/21/2015     S    19447   D $80.36   1832969   I   See footnote   (1)

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. 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 7. Title and Amount of Securities Underlying Derivative Security
(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

Explanation of Responses:
( 1)  The securities to which this filing relates are held directly by Adage Capital Partners, L.P., a Delaware limited partnership (the "Fund"). Adage Capital Partners GP, L.L.C., a Delaware limited liability company ("ACPGP"), serves as the general partner of the Fund and as such has discretion over the portfolio securities beneficially owned by the Fund. Adage Capital Advisors, L.L.C., a Delaware limited liability company ("ACA"), is the managing member of ACPGP and directs ACPGP's operations. Robert Atchinson and Phillip Gross are the managing members of ACPGP and ACA and general partners of the Fund. ACPGP, ACA, Robert Atchinson and Phillip Gross disclaim beneficial ownership of the reported securities except to the extent of their pecuniary interest therein.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
ADAGE CAPITAL PARTNERS GP LLC
200 CLARENDON STREET, 52ND FLOOR
BOSTON, MA 02116

X

Adage Capital Partners, L.P.
200 CLARENDON STREET, 52ND FLOOR
BOSTON, MA 02116

X

Adage Capital Advisors, L.L.C.
200 CLARENDON STREET
52ND FLOOR
BOSTON, MA 02116

X

Atchinson Robert
200 CLARENDON STREET
52ND FLOOR
BOSTON, MA 02116

X

Gross Phillip
200 CLARENDON STREET
52ND FLOOR
BOSTON, MA 02116

X


Signatures
/s/ Adage Capital Partners GP, L.L.C.; By its managing member Adage Capital Advisors, L.L.C.; By its managing member Robert Atchinson 4/21/2015
** Signature of Reporting Person Date

/s/ Adage Capital Partners, L.P.; By its general partner Adage Capital Partners GP, L.L.C.; By its managing member Adage Capital Advisors, L.L.C.; By its managing member Robert Atchinson 4/21/2015
** Signature of Reporting Person Date

/s/ Adage Capital Advisors, L.L.C.; By its managing member Robert Atchinson 4/21/2015
** Signature of Reporting Person Date

/s/ Robert Atchinson 4/21/2015
** Signature of Reporting Person Date

/s/ Phillip Gross 4/21/2015
** 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 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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