TECOGEN VP granted 29,013 restricted shares

Lafaille Stephen reported acquisition or exercise transactions in this Form 4 filing.

The filer has since corrected this document, so the figures below are the ones originally reported and some of them may have changed. Read the amended Form 4/A for what the company says now.

Rhea-AI Filing Summary

Lafaille Stephen reported acquisition or exercise transactions in this Form 4 filing.

TECOGEN INC. reported that VP of Business Development Stephen Lafaille received a grant of 29,013 shares of common stock as a compensation award. The shares were granted at no cash cost to him and are structured as a Restricted Stock Award under the company’s 2022 Stock Incentive Plan.

The award vests in stages, with 25% of the shares vesting each year, which is designed to encourage long-term alignment with the company’s performance and retention over several years. Following this grant, Lafaille holds 29,013 common shares directly, with no derivative securities reported in this filing.

Insider Trade Summary

Grant/Award: 29,013 shares

Grant/Award 1 txn

Insider Lafaille Stephen

Role VP of Business Development

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	29,013	$0.00	$0.00

Holdings After Transaction: Common Stock — 29,013 shares (Direct)

Footnotes (2)

1. F1. Restricted Stock Award pursuant to 2022 Stock Incentive Plan. Vests 25% per year.
2. F2. Vests 25% per year.

Key Figures

Restricted stock granted: 29,013 shares Grant price: $0.0000 per share Shares held after grant: 29,013 shares +1 more

4 metrics

Restricted stock granted 29,013 shares Grant of common stock on June 26, 2026

Grant price $0.0000 per share Reported transaction price for the award

Shares held after grant 29,013 shares Total direct holdings following the transaction

Annual vesting rate 25% per year Restricted Stock Award vesting schedule

Key Terms

Restricted Stock Award, 2022 Stock Incentive Plan, vests 25% per year, Form 4

4 terms

Restricted Stock Award financial

"Restricted Stock Award pursuant to 2022 Stock Incentive Plan."

A restricted stock award is company shares given to an employee or executive that cannot be sold or fully owned until certain conditions—like staying with the company for a set time or hitting performance targets—are met. Think of it as a gift that only becomes yours after you fulfill specific obligations; for investors, these awards matter because they can increase the total shares outstanding when they vest, reveal how management is being paid and motivated, and create potential selling pressure when restrictions lift.

2022 Stock Incentive Plan financial

"Restricted Stock Award pursuant to 2022 Stock Incentive Plan."

vests 25% per year financial

"Vests 25% per year."

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did TECOGEN INC. (TGEN) insider Stephen Lafaille report on this Form 4?

Stephen Lafaille reported receiving a grant of 29,013 shares of TECOGEN INC. common stock. The award is a Restricted Stock Award under the 2022 Stock Incentive Plan, reflecting stock-based compensation rather than an open-market purchase or sale.

How many TECOGEN INC. (TGEN) shares were granted to Stephen Lafaille?

Stephen Lafaille was granted 29,013 shares of TECOGEN INC. common stock. These shares represent a new Restricted Stock Award and, after the transaction, his reported direct holdings total 29,013 shares as shown in the Form 4.

At what price were the TECOGEN INC. (TGEN) shares granted to Stephen Lafaille?

The 29,013 TECOGEN INC. shares were granted at a reported price of $0.0000 per share. This reflects a stock-based compensation award, not an open-market purchase requiring cash payment by Lafaille.

What type of equity award did TECOGEN INC. (TGEN) grant to Stephen Lafaille?

The filing shows Lafaille received a Restricted Stock Award under TECOGEN INC.’s 2022 Stock Incentive Plan. Restricted stock typically comes with vesting conditions, encouraging long-term service and alignment with shareholder interests over time.

How does the TECOGEN INC. (TGEN) Restricted Stock Award to Lafaille vest?

The Restricted Stock Award to Stephen Lafaille vests 25% per year. This means the 29,013 granted shares become fully vested over four years, with one-quarter of the award vesting in each annual installment.

Did Stephen Lafaille buy or sell TECOGEN INC. (TGEN) shares in the market?

No open-market buy or sell is reported. The Form 4 shows an acquisition coded as a grant or award, meaning Lafaille received 29,013 shares as compensation rather than purchasing or selling shares in the open market.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/30/2026 - 08:36 PM EDT Learn about SEC filing dates

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
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^*

Lafaille Stephen

(Last) (First) (Middle)

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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/26/2026

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(1)	06/26/2026		A		29,013	A	(1)	29,013(2)	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

Explanation of Responses:

1. Restricted Stock Award pursuant to 2022 Stock Incentive Plan. Vests 25% per year.

2. Vests 25% per year.

Remarks:

	/s/ Stephen Lafaille	06/30/2026
	** 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)