SCHEDULE 13D/A 0000902664-25-001603 0002043653 XXXXXXXX LIVE 2 Common Stock, par value $0.0001 per share 10/15/2025 false 0001031316 35471R106 FRANKLIN STREET PROPERTIES CORP /MA/

401 EDGEWATER PLACE STE 200 WAKEFIELD MA 01880

Converium Capital Inc. (514) 418-0201 1250, boul. Rene-Levesque Ouest Suite 4030 Montreal A8 H3B 4W8 Ele Klein & Brandon Gold (212) 756-2000 McDermott Will & Schulte LLP 919 Third Avenue New York NY 10022 0002043653 N Converium Capital Inc. AF N Z4 0.00 6506414.00 0.00 6506414.00 6506414.00 N 6.3 CO IA Y Aaron Stern AF N Z4 0.00 6506414.00 0.00 6506414.00 6506414.00 N 6.3 IN HC Common Stock, par value $0.0001 per share FRANKLIN STREET PROPERTIES CORP /MA/ 401 EDGEWATER PLACE STE 200 WAKEFIELD MA 01880 The following constitutes Amendment No. 2 ("Amendment No. 2") to the Schedule 13D filed with the Securities and Exchange Commission on March 26, 2025 (as amended, the "Schedule 13D"). This Amendment No. 2 supplements Items 4 and 7 as set forth below. Capitalized terms used herein and not otherwise defined in this Amendment No. 2 have the meanings set forth in the Schedule 13D. Following the resignation of Bruce Schanzer from the Board and pursuant to the terms of the Cooperation Agreement, Converium and the Issuer agreed to appoint Jennifer Bitterman ("Ms. Bitterman") to the Board as a Replacement Director (as defined in the Cooperation Agreement). In connection therewith, Converium and the Converium Funds entered into a letter agreement with the Issuer on October 15, 2025 (the "Letter Agreement"), setting forth the terms of Ms. Bitterman's appointment to the Board. The full text of the Letter Agreement is included as Exhibit 99.3 and is incorporated by reference herein. Exhibit 99.3: Letter Agreement, dated October 15, 2025 (incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K filed by the Issuer with the SEC on October 15, 2025). Converium Capital Inc. /s/ Michael Rapps 10/15/2025 Aaron Stern /s/ Aaron Stern 10/15/2025