1、S-1 1 s-1.htm S-1As filed with the United States Securities and Exchange Commission on July 15,2025.Registration No.333-_UNITED STATESSECURITIES AND EXCHANGE COMMISSIONWASHINGTON,D.C.20549_FORM S-1REGISTRATION STATEMENTUNDERTHE SECURITIES ACT OF 1933TECOGEN INC.(Exact name of registrant as specified

2、 in its charter)Delaware(State or other jurisdiction of incorporation ororganization)3585(Primary Standard IndustrialClassification Code Number)04-3536131(IRS EmployerIdentification Number)76 Treble Cove RoadBuilding 1North Billerica,MA 01862781.466.6400(Address,including zip code,and telephone numb

3、er,including area code,of the registrants principal executive offices)John K.Whiting,IV,Esq.General CounselTecogen Inc.76 Treble Cove RoadBuilding 1North Billerica,Massachusetts 01862Telephone:781.466.6016(Name,address,including zip code,and telephone number,including area code,of agent for service)

4、Copies of Communications to:Neil R.E.Carr,Esq.Somertons,PLLC1025 Connecticut Avenue,N.W.Suite 1000Washington,D.C.20036Telephone:202.459.4651M.Ali Panjwani,Esq.Pryor Cashman LLP7 Times Square40 FloorNew York,NY 10035Telephone:212.326.0820Approximate date of commencement of proposed sale to the public

5、:As soon as practicable after this registration statement becomes effective.If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the SecuritiesAct of 1933,check the following box.oIf this Form is filed to register additi

6、onal securities for an offering pursuant to Rule 462(b)under the Securities Act,check the following box andlist the Securities Act registration statement number of the earlier effective registration statement for the same offering.oIf this Form is a post-effective amendment filed pursuant to Rule 46