X0306 4 2017-09-18 0 0001708405 Tremont Mortgage Trust TRMT 0001273871 PORTNOY ADAM D. TWO NEWTON PLACE 255 WASHINGTON STREET, SUITE 300 NEWTON MA 02458 1 0 1 0 Common Shares of Beneficial Interest 2017-09-18 4 A 0 600000 20.00 A 600100 I BY LLC Shares were acquired directly by Tremont Realty Advisors LLC ("TRA") in a private placement transaction at $20.00 per share. All shares reported are held directly by TRA. TRA is a direct wholly owned subsidiary of The RMR Group LLC ("RMR LLC"), which is a direct majority owned operating subsidiary of The RMR Group Inc. ("RMR INC"), of which Mr. Portnoy is a managing director and controlling shareholder through ABP Trust. Mr. Portnoy is a holder of shares of beneficial interest in, and a trustee of, ABP Trust. Mr. Portnoy is also the President, beneficial owner and a director of TRA. RMR INC, RMR LLC and Mr. Portnoy may be deemed to beneficially own the shares owned directly by TRA. Mr. Portnoy disclaims beneficial ownership of the shares owned by TRA except to the extent of his pecuniary interest therein. /s/ ADAM D. PORTNOY 2017-09-18