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 *

PORTNOY BARRY M
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 (MM/DD/YYYY)

6/5/2015
(Street)

NEWTON, MA 02458
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ 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 Shares of Beneficial Interest   6/5/2015     A    8673.5   (1) A $20.02   (1) 112760.45   (2) I   See Footnote   (3)
Common Shares of Beneficial Interest   6/5/2015     J (4)    1289750   (4) A $19.95   (4) 1402510.45   (2) I   See Footnote   (3)
Common Shares of Beneficial Interest                  286814.076   (5) D    

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)  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 $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 Chairman, majority 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.
( 5)  Includes 5,414.343 shares acquired under the Senior Housing Properties Trust Dividend Reinvestment Plan since the last Section 16 filing by Mr. Portnoy.

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



Signatures
/s/ Barry M. Portnoy 6/9/2015
** 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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