TECOGEN INC. — Director's Dealing 2025

Jun 24, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: TECOGEN INC. (TGEN)
CIK: 0001537435
Period of Report: 2025-03-03

Reporting Person: Lafaille Stephen (VP of Business Development)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-03-03	Common Stock	P	400	$2.50	Acquired	400	Direct
2025-06-03	Common Stock	X	10000	$0.71	Acquired	10400	Direct
2025-06-03	Common Stock	S	10000	$4.88	Disposed	400	Direct
2025-06-04	Common Stock	X	15000	$0.71	Acquired	15400	Direct
2025-06-04	Common Stock	S	15000	$5	Disposed	400	Direct
2025-06-06	Common Stock	X	25000	$1.10	Acquired	25400	Direct
2025-06-06	Common Stock	S	25000	$5.98	Disposed	400	Direct
2025-06-23	Common Stock	X	10000	$1.10	Acquired	10400	Direct
2025-06-23	Common Stock	S	10000	$7.25	Disposed	400	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-06-03	Stock Options (Right to Buy)	$0.71	X	10000	Disposed	2030-07-09	Common Stock (50000)	Direct
2025-06-04	Stock Options (Right to Buy)	$0.71	X	15000	Disposed	2030-07-09	Common Stock (40000)	Direct
2025-06-06	Stock Options (Right to Buy)	$1.10	X	25000	Disposed	2032-01-21	Common Stock (52500)	Direct
2025-06-23	Stock Options (Right to Buy)	$1.10	X	10000	Disposed	2032-01-21	Common Stock (25000)	Direct

Footnotes

F1: Shares acquired pursuant to exercise of Stock Option Agreement dated 7/9/2020

F2: Multiple share sales between $4.75 and $5.25 per share

F3: 10,000 shares sold for $4.90 per share, and 5,000 shares sold for $5.10 per share

F4: Shares acquired pursuant to stock option agreement dated 1/21/2022

F5: Multiple share sales between $5.85 and $6.10

F6: Vests 50% upon achievement of Adjusted EBITDA goal of 2% of revenue in two consecutive quarters, and 50% upon achievement of Adjusted EBITDA goal of 3% of revenue in four consecutive quarters

F7: Vests 50% per year