TECOGEN: John Hatsopoulos Files Form 4 on March 23, 2026

TL;DR

**Insider John Hatsopoulos filed a Form 4 for Tecogen, signaling a recent transaction.**

AI Summary

This Form 4 filing indicates that John Hatsopoulos, a reporting person for Tecogen Inc., filed a statement of changes in beneficial ownership of securities on March 23, 2026, for a transaction that occurred on March 20, 2026. While the filing confirms Hatsopoulos's involvement with Tecogen, it does not detail the specific nature or value of the transaction. This matters to investors because insider transactions can signal management's confidence (or lack thereof) in the company's future, potentially influencing stock price movements.

Why It Matters

Insider filings like this can provide clues about how company executives view the stock's prospects, which can be a significant factor for investors.

Risk Assessment

Risk Level: low — This filing is purely administrative and does not inherently present a direct financial risk, though the underlying transaction could be significant.

Analyst Insight

A smart investor would retrieve the full Form 4 document to understand the specifics of John Hatsopoulos's transaction (e.g., whether it was a purchase or sale, the number of shares, and the price) before making any investment decisions, as this summary only provides the filing details, not the transaction specifics.

Key Players & Entities

• John Hatsopoulos (person) — Reporting Person for Tecogen Inc.
• TECOGEN INC. (company) — Issuer of the securities
• 0001537435 (company) — CIK for TECOGEN INC.
• 0001274775 (person) — CIK for John Hatsopoulos

Forward-Looking Statements

• The specific details of John Hatsopoulos's transaction (e.g., buy/sell, quantity, price) will be revealed within the full Form 4 document. (John Hatsopoulos) — high confidence, target: 2026-03-23
• Investors will monitor subsequent filings or news for further context on this insider transaction. (TECOGEN INC.) — medium confidence, target: 2026-04-23

FAQ

Filing Documents

• wk-form4_1774290743.html (4)
• wk-form4_1774290743.xml (4) — 5KB
• 0001274775-26-000003.txt ( ) — 7KB

From the Filing

SEC FORM 4 SEC Form 4 FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940 OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5    Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).    Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10. 1. Name and Address of Reporting Person * Hatsopoulos John (Last) (First) (Middle) C/O TECOGEN INC. 76 TREBLE COVE ROAD (Street) NORTH BILLERICA MASSACHUSETTS 01862 (City) (State) (Zip) UNITED STATES (Country) 2. Issuer Name and Ticker or Trading Symbol TECOGEN INC. [ TGEN ] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) Other (specify below) 2a. Foreign Trading Symbol 3. Date of Earliest Transaction (Month/Day/Year) 03/20/2026 6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person 4. If Amendment, Date of Original Filed (Month/Day/Year) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 03/20/2026 M 50,000 (1) A $ 0.88 1,038,951 D Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option (Right to Buy) $ 0.88 03/20/2026 M 50,000 (2) 09/20/2024 09/20/2033 Common Stock 50,000 $ 0.88 0 D Explanation of Responses: 1. Shares acquired pursuant to exercise of Stock Option Agreement dated 9/20/2023 2. Exercise of Stock Option Agreement dated 9/20/2023 Remarks: /s/ John N. Hatsopoulos 03/23/2026 ** Signature of Reporting Person Date Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. * If the form is filed by more than one reporting person, see Instruction 4 (b)(v). ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a). Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure. Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number. * Form 4: SEC 1474 (03-26)

View Full Filing

View this 4 filing on SEC EDGAR