Ownership Submission
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

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
PORTNOY ADAM
  2. Issuer Name and Ticker or Trading Symbol
SENIOR HOUSING PROPERTIES TRUST [NYSE: SNH]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
(Last)
(First)
(Middle)
C/O REIT MANAGEMENT & RESEARCH LLC, TWO NEWTON PL., 255 WASH. ST., STE. 300
3. Date of Earliest Transaction (Month/Day/Year)
06/05/2015
(Street)

NEWTON, MA 02458
4. If Amendment, Date Original Filed(Month/Day/Year)
6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)
2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction 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 Shares of Beneficial Interest 06/05/2015   A   7,096.5 (1) A $ 20.02 (1) 92,258.55 (2) I See Footnote (3)
Common Shares of Beneficial Interest 06/05/2015   J(4)   1,055,250 (4) A $ 19.95 (4) 1,147,508.55 (2) I See Footnote (3)
Common Shares of Beneficial Interest               132,873.55 D  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)
2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction 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
(Month/Day/Year)
7. Title and Amount of Underlying Securities
(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

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
PORTNOY ADAM
C/O REIT MANAGEMENT & RESEARCH LLC
TWO NEWTON PL., 255 WASH. ST., STE. 300
NEWTON, MA 02458
  X      

Signatures

 /s/ Adam Portnoy   06/09/2015
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) These Common Shares were issued as a portion of the management fee paid by the Issuer pursuant to the business management agreement between the Issuer and Reit Management & Research LLC ("RMR LLC") in effect as of the date of the transaction at the date of the transaction at $20.02, the average of the closing prices of the Common Shares on the New York Stock Exchange for each trading day during the month of May 2015.
(2) On May 19, 2015, RMR LLC distributed all of the Common Shares of the Issuer it then directly owned to Reit Management & Research Trust ("RMR Trust"), then its sole member. Mr. Portnoy is the President and Chief Executive Officer, a beneficial owner and a trustee of RMR Trust.
(3) Represents the pecuniary interest of Mr. Portnoy in Common Shares owned by RMR Trust.
(4) On June 5, 2015, RMR Trust, RMR LLC, Reit Management & Research Inc. and the Issuer entered into a Transaction Agreement for an Up-C transaction pursuant to which, among other things, RMR Trust acquired 2,345,000 newly issued Common Shares valued at $19.95 per share, the volume weighted average trading price per Common Share on the New York Stock Exchange during the 20 business days prior to the closing of the transactions contemplated by the Transaction Agreement.

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