John N. Hatsopoulos - 20 Mar 2026 Form 4 Insider Report for TECOGEN INC. (TGEN)

Reporting relationship: Director
Issuer ticker: TGEN
Reported as of: 20 Mar 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 23 Mar 2026, 14:32:27 UTC
Prior SEC filing: 27 Sep 2024
Source filing: View source filing
Reporting owner signature: /s/ John N. Hatsopoulos

Key filing fact

John N. Hatsopoulos filed Form 4 for TECOGEN INC. (TGEN) on 23 Mar 2026.

Key facts

This page summarizes John N. Hatsopoulos's Form 4 filing for TECOGEN INC. (TGEN).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 23 Mar 2026, 14:32.

Change

Previous filing in this sequence was filed on 27 Sep 2024.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001274775 Primary reporting owner

Hatsopoulos John

Relationship: Director
Address: C/O TECOGEN INC., 76 TREBLE COVE ROAD, NORTH BILLERICA
Signature: /s/ John N. Hatsopoulos
Signature date: 23 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

TGEN transaction

Common Stock

Options Exercise

Transaction value
Shares: +50,000
Change %: +5.1%
Price: $0.8800^*
Shares after: 1,038,951
Date: 20 Mar 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

TGEN transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
Shares: -50,000
Change %: -100%
Price: $0.8800^*
Shares after: 0
Date: 20 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 50,000
Exercise price: $0.8800
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Shares acquired pursuant to exercise of Stock Option Agreement dated 9/20/2023

Footnote F2

Exercise of Stock Option Agreement dated 9/20/2023

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