Item 7.01. Regulation FD Disclosure. On April 30, 2025, Tecogen Inc. (the “ Company”) issued a press release announcing that its shares of common stock have been approved for listing on the NYSE American LLC (“ NYSE American”) stock exchange. The Company’s shares of common stock are expected to begin trading under its current symbol “ TGEN” on the NYSE American commencing at the open of trading on or about May 6, 2025, subject to continued compliance by the Company with exchange rules. The Company’s shares of common stock are currently quoted on the OTC Markets OTCQX Best Market, and will continue to trade on the OTCQX Best Market until the close of business on or about May 5, 2025. A copy of the press release is attached as Exhibit 99.1 and is incorporated herein by reference. The information furnished herein pursuant to Item 7.01 of this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended(“ Securities Exchange Act”), or otherwise subject to the liabilities of that section, and shall not be deemed to be incorporated by reference into any of our filings under the Securities Act of 1933, as amended, or the Securities Exchange Act, whether made before or after the date hereof and regardless of any general incorporation language in such filings, except to the extent expressly set forth by specific reference in such a filing.

Item 9.01. Financial Statements and Exhibits. (d) Exhibits Exhibit Description 99.1 Press release dated April 30, 2025 announcing authorization to list Tecogen shares on the NYSE American stock exchange ─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the Company has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized. TECOGEN INC. By: /s/ Abinand Rangesh May 1, 2025 Abinand Rangesh, Chief Executive Officer