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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

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FORM 8-K

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

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Date of Report (Date of earliest event reported):

April 28, 2026

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Franklin Street Properties Corp.

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(Exact name of registrant as specified in its charter)

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Maryland | 001-32470 | 04-3578653
(State or other jurisdiction of incorporation) | (Commission File Number) | (IRS Employer Identification No.)

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401 Edgewater Place, Suite 200, Wakefield, Massachusetts | 01880
(Address of principal executive offices) | (Zip Code)

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Registrant’s telephone number, including area code: (781) 557-1300

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

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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):

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☐ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

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☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

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☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

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☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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

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Title of each class | ​ ​ ​ | Trading Symbol (s) | ​ ​ ​ | Name of each exchange on which registered
Common Stock, $.0001 par value per share | ​ | FSP | ​ | NYSE American

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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).

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Emerging growth company ☐

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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. ☐

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Item 2.02. Results of Operations and Financial Condition.

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On April 28, 2026, Franklin Street Properties Corp. (the “Registrant”) announced its financial results for the first quarter ended March 31, 2026. The full text of the press release issued in connection with the announcement is furnished as Exhibit 99.1 to this Current Report on Form 8-K. The press release references certain supplemental operating and financial data that is now available on the Registrant’s website. A copy of the supplemental operating and financial data is attached hereto as Exhibit 99.2 and is incorporated by reference herein.

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The information in this Form 8-K (including Exhibits 99.1 and 99.2) shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934 (the "Exchange Act") or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933 or the Exchange Act, except as expressly set forth by specific reference in such a filing.

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Item 9.01. Financial Statements and Exhibits.

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| (d) | Exhibits

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Exhibit No. | ​ ​ ​ | Description
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99.1 | ​ | Press Release issued by Franklin Street Properties Corp. on April 28, 2026.
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99.2 | ​ | Supplemental Operating and Financial Data for the Fi rst Quarter of 2026.
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104 | ​ | Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101).

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SIGNATURES

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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.

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​ | FRANKLIN STREET PROPERTIES CORP.
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Date: April 28, 2026 | By: | /s/ George J. Carter
​ | ​ | George J. Carter
​ | ​ | Chief Executive Officer

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