Form 3 Filing for OFFICE PROPERTIES INCOME TRUST

This filing is an initial statement of beneficial ownership of securities for Adam D. Portnoy, a director of OFFICE PROPERTIES INCOME TRUST (OPI). The filing reports that Adam D. Portnoy, through entities affiliated with The RMR Group LLC, has a beneficial ownership of 439,072 common shares of beneficial interest in OPI. The RMR Group LLC is a majority-owned subsidiary of The RMR Group Inc., of which Mr. Portnoy is a managing director and controlling shareholder. While Mr. Portnoy, ABP Trust, and RMR Inc. may be deemed beneficial owners, they disclaim beneficial ownership except to the extent of their pecuniary interest. The filing date is June 24, 2026, and the period of report is June 17, 2026.