Tecogen counsel granted 19,342 restricted shares

Amended Form 4 reports a corrected post-grant share balance after a 19,342-share restricted stock award to Tecogen’s General Counsel.

This filing corrects an earlier one, and you can read the original Form 4 if you want to see what changed.

Rhea-AI Filing Summary

TECOGEN INC. (symbol: TGEN) is the issuer of record for a Form 4/A filing submitted to the SEC. Whiting John Kimball IV reported acquisition or exercise transactions in this Form 4 filing.

TECOGEN INC. (TGEN) reported an amended insider transaction for its General Counsel & Secretary, John Kimball Whiting IV. On June 26, 2026, he received a grant of 19,342 shares of restricted common stock at no cost under the Tecogen Inc. 2022 Stock Incentive Plan, with restrictions lapsing 25% per year. Following this award, his directly held common stock position is reported as 41,954 shares, correcting the previously reported post‑grant balance.

Insider Trade Summary

Grant/Award: 19,342 shares

Grant/Award 1 txn

Insider Whiting John Kimball IV

Role General Counsel & Secretary

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1, F2, F3	19,342	$0.00	$0.00

Holdings After Transaction: Common Stock — 41,954 shares (Direct)

Footnotes (3)

1. F1. Restricted stock award pursuant to Tecogen Inc. 2022 Stock Incentive Plan. Restrictions lapse 25% per year.
2. F2. Not applicable
3. F3. Corrected number of shares beneficially owned following restricted stock grant previously reported on June 30, 2026.

Key Figures

Restricted stock granted: 19,342 shares Price per share for grant: $0.00 per share Shares beneficially owned after grant: 41,954 shares +2 more

5 metrics

Restricted stock granted 19,342 shares Grant of Tecogen common stock on June 26, 2026 to General Counsel & Secretary

Price per share for grant $0.00 per share Restricted stock award under Tecogen Inc. 2022 Stock Incentive Plan

Shares beneficially owned after grant 41,954 shares Direct ownership by John Kimball Whiting IV after correcting prior report

Vesting rate 25% per year Restrictions on restricted stock lapse 25% per year

Number of acquire-type transactions in filing 1 transaction Single restricted stock grant reported in this Form 4/A

Key Terms

Restricted stock, 2022 Stock Incentive Plan, beneficially owned, Form 4/A

4 terms

Restricted stock financial

"Restricted stock award pursuant to Tecogen Inc. 2022 Stock Incentive Plan."

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

2022 Stock Incentive Plan financial

"Restricted stock award pursuant to Tecogen Inc. 2022 Stock Incentive Plan."

beneficially owned financial

"Corrected number of shares beneficially owned following restricted stock grant"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Form 4/A regulatory

"Filed to amend Form 4 filed by Reporting Person on June 30, 2026."

Form 4/A is an amended filing that corrects or updates an earlier Form 4, the mandatory report that insiders (like company executives, directors, or large shareholders) must file when their ownership stakes change. Think of it as an edited receipt showing who bought or sold stock and when; investors use it to track insider confidence, detect potential conflicts, and spot trading patterns that might signal future company prospects.

FAQ

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

What insider transaction did Tecogen Inc. (TGEN) report in this amended Form 4?

The filing reports that General Counsel & Secretary John Kimball Whiting IV received a grant of 19,342 shares of Tecogen common stock as restricted stock on June 26, 2026 under the company’s 2022 Stock Incentive Plan.

How many Tecogen (TGEN) shares does the insider hold after this grant?

After the restricted stock grant, John Kimball Whiting IV is reported as directly holding 41,954 shares of Tecogen common stock, reflecting a corrected post-grant beneficial ownership figure.

What are the vesting terms of the Tecogen (TGEN) restricted stock granted?

The restricted stock award vests over time, with restrictions lapsing 25% per year as disclosed, pursuant to the Tecogen Inc. 2022 Stock Incentive Plan.

Why is this Tecogen (TGEN) Form 4 an amendment (Form 4/A)?

The amendment states it was filed to correct the number of shares beneficially owned following the restricted stock grant that had been previously reported on June 30, 2026.

Was the Tecogen (TGEN) restricted stock grant made under a Rule 10b5-1 trading plan?

No. The document-level checkbox indicates no Rule 10b5-1 plan, and the footnotes do not describe the grant as made under such a trading plan.

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

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Available on EDGAR 09/08/2026 - 05:12 PM EDT Accepted by SEC EDGAR 09/08/2026 - 05:11 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^*

Whiting John Kimball IV

(Last) (First) (Middle)

76 TREBLE COVE ROAD

BLDG 1

(Street)

N. 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)
	General Counsel & Secretary

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)
06/30/2026

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		19,342	A	$0(2)	41,954(3)	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 Tecogen Inc. 2022 Stock Incentive Plan. Restrictions lapse 25% per year.

2. Not applicable

3. Corrected number of shares beneficially owned following restricted stock grant previously reported on June 30, 2026.

Remarks:

Filed to amend Form 4 filed by Reporting Person on June 30, 2026.

	/s/ John K. Whiting, IV	09/08/2026
	** 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)