X0306 4 2014-09-08 0 0001075415 SENIOR HOUSING PROPERTIES TRUST NYSE: SNH 0001241559 PORTNOY BARRY M C/O REIT MANAGEMENT & RESEARCH LLC TWO NEWTON PL., 255 WASH. ST., STE. 300 NEWTON MA 02458 1 0 0 0 Common Shares of Beneficial Interest 2014-09-08 4 A 0 6679.2 23.05 A 47292.3 I See Footnote Common Shares of Beneficial Interest 269309.536 D Pursuant to the terms of a business management agreement (the "Management Agreement") between the Issuer and Reit Management & Research LLC ("RMR"), the per share price amount listed above is the average of the closing prices of the Common Shares on the New York Stock Exchange for each trading day during the month of August 2014. Represents the pecuniary interest of Mr. Portnoy in Common Shares owned by RMR, of which Reit Management & Research Trust ("RMR Trust") is the sole member. Mr. Portnoy is the Chairman and a director of RMR, and the Chairman, majority beneficial owner and a trustee of RMR Trust. These Common Shares were issued as a portion of the management fee paid by the Issuer to RMR pursuant to the Management Agreement. Includes 4,343.147 shares acquired under the Senior Housing Properties Trust Dividend Reinvestment Plan since the last Section 16 filing by Mr. Portnoy. /s/ Barry M. Portnoy 2014-09-08