[Form 4] Tecogen Inc. Insider Trading Activity

Rhea-AI Filing Summary

On 28 Jul 2025, Tecogen Inc. (TGEN) submitted a Form 4 disclosing routine equity compensation to VP of Business Development Stephen Lafaille for transactions dated 24 Jul 2025.

• Restricted stock: 11,976 common shares granted at $0 cost, vesting 25% per year. Direct ownership rises to 12,376 shares.
• Stock options: 24,075 options with a $8.35 strike price, first exercisable 24 Jul 2026 and expiring 24 Jul 2035. Lafaille’s total option holdings increase to 72,937.

No shares were sold. The filing signals continued alignment of the executive’s incentives with shareholders but does not constitute open-market buying or selling.

Positive

• Insider increased direct ownership by 11,976 shares without selling any existing holdings

Negative

• None.

Insights

Securities Analyst

TL;DR: Routine equity grant; insider adds shares & options, no open-market trade—limited market impact.

The Form 4 reflects standard annual compensation: 11,976 restricted shares plus 24,075 options at an $8.35 strike. These awards boost Lafaille’s direct stake to 12,376 shares and expand option exposure to 72,937 contracts. Because the transaction is a zero-cost grant rather than a purchase, it offers little signal on perceived valuation. There is no dilution of note at the company level, and no insider selling pressure. Overall impact on Tecogen’s share price or capital structure is negligible.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Lafaille Stephen

(Last) (First) (Middle)

76 TREBLE COVE ROAD

(Street)

NORTH BILLERICA MA 01862

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
TECOGEN INC. [ TGEN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	VP of Business Development

3. Date of Earliest Transaction (Month/Day/Year)
07/24/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	07/24/2025		A		11,976(1)	A	$0	12,376	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)	$8.35	07/24/2025		A		24,075		07/24/2026(2)	07/24/2035	Common Stock	24,075	$8.35	72,937	D

Explanation of Responses:

1. Restricted Stock Award, vests 25% per year

2. Vests 25% per year

Remarks:

	/s/ Stephen Lafaille	07/28/2025
	** 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.

FAQ

What did Tecogen (TGEN) insider Stephen Lafaille acquire?

He received 11,976 restricted shares and 24,075 stock options on 24 Jul 2025.

How many Tecogen shares does Lafaille own after the grant?

His direct ownership rose to 12,376 common shares.

What are the key terms of the new stock options?

Strike price $8.35, first exercisable 24 Jul 2026, expiration 24 Jul 2035, covering 24,075 shares.

Were any Tecogen shares sold in this Form 4?

No. The filing reports only acquisitions; no dispositions occurred.

How do the restricted shares vest?

The award vests 25% per year according to the filing’s footnote.