8-K

UNITED

STATES

SECURITIES

AND EXCHANGE COMMISSION

Washington,

D.C. 20549

FORM 8-K

CURRENT

REPORT

Pursuant

to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 14, 2026

Franklin

Street Properties Corp.

(Exact name of registrant as specified in its charter)

Registrant’s telephone

number, including area code: (781)557-1300

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 5.07 Submission of Matters to a Vote ofSecurity Holders.

Franklin Street Properties Corp., a Maryland corporation (the “Company”), held its 2026 Annual Meeting of Stockholders (the “2026 Annual Meeting”) on May 14, 2026. The 2026 Annual Meeting was called for the following purposes: (1) to elect five directors, each to serve for a one-year term expiring at the 2027 Annual Meeting of Stockholders and until his or her respective successor is duly elected and qualified, (2) to ratify the Audit Committee’s appointment of Ernst & Young LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026, and (3) to approve, by non-binding vote, the Company’s executive compensation.

(1) The following table sets forth the names of the directors elected at the 2026 Annual Meeting for a new one-year term expiring at the 2027 Annual Meeting of Stockholders and the final number of votes cast for, against or abstaining from voting for each director and broker non-votes.

(2) The proposal to ratify the Audit Committee’s appointment of Ernst & Young LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026 was approved. The final number of votes cast for, against or abstaining from voting on that proposal are listed below.

(3) The proposal to approve, by non-binding vote, the Company’s executive compensation was approved. The final number of votes cast for, against or abstaining from voting on that proposal and broker non-votes are listed below.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: May 14, 2026