Tecogen CEO granted 174K restricted shares June 26

Amended Form 4 updates Tecogen CEO Rangesh Abinand’s restricted stock grant holdings after a June 26, 2026 award.

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. Rangesh Abinand reported acquisition or exercise transactions in this Form 4 filing.

TECOGEN INC. (TGEN) reported that its Chief Executive Officer and director, Rangesh Abinand, received a grant of 174,081 shares of Common Stock as a restricted stock award on June 26, 2026 under the Tecogen Inc. 2022 Stock Incentive Plan, with restrictions lapsing 25% per year. This amended filing corrects the number of shares beneficially owned after the grant to 241,274 shares, and no Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Grant/Award: 174,081 shares

Grant/Award 1 txn

Insider Rangesh Abinand

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1, F2, F3	174,081	$0.00	$0.00

Holdings After Transaction: Common Stock — 241,274 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 Form 4 on June 30, 2026.

Key Figures

Restricted stock award: 174,081 shares Shares beneficially owned after transaction: 241,274 shares Reported transaction price per share: $0.00 per share +1 more

4 metrics

Restricted stock award 174,081 shares Grant of Common Stock to CEO Rangesh Abinand on June 26, 2026

Shares beneficially owned after transaction 241,274 shares Direct Common Stock holdings after the restricted stock grant

Reported transaction price per share $0.00 per share Accounting grant price field for the restricted stock award

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

Key Terms

Restricted stock award, 2022 Stock Incentive Plan, beneficially owned

3 terms

Restricted stock award financial

"Restricted stock award pursuant to Tecogen Inc. 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 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.

FAQ

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

What insider transaction did TECOGEN INC. (TGEN) report for June 26, 2026?

TECOGEN INC. reported that CEO and director Rangesh Abinand received a restricted stock award of 174,081 shares of Common Stock on June 26, 2026, classified as a grant, award, or other acquisition with a reported price per share of $0.00 under the company’s 2022 Stock Incentive Plan.

How many TGEN shares does the CEO beneficially own after this amended Form 4?

After the June 26, 2026 restricted stock grant, the amended Form 4 reports that Rangesh Abinand beneficially owns 241,274 shares of Tecogen Inc. Common Stock directly. This corrects the post-transaction share count previously reported on the Form 4 filed on June 30, 2026.

What are the vesting terms of the restricted stock award reported by TGEN?

The filing states that the grant is a restricted stock award pursuant to the Tecogen Inc. 2022 Stock Incentive Plan and that the restrictions lapse 25% per year. This means the award vests in four equal annual installments, subject to the plan’s terms.

Why did TECOGEN INC. file this as an amended Form 4 (Form 4/A)?

The company filed this as an amendment to correct the number of shares beneficially owned by Rangesh Abinand following the restricted stock grant that had been previously reported on Form 4 on June 30, 2026. The amendment does not change the size of the grant itself.

Was the TECOGEN (TGEN) CEO’s restricted stock grant made under a Rule 10b5-1 plan?

No. The amended Form 4 indicates that no Rule 10b5-1 trading plan is reported for this transaction. The award is described as a restricted stock grant under the Tecogen Inc. 2022 Stock Incentive Plan, with no pre-arranged trading plan disclosure.

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

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

Rangesh Abinand

(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)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

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		174,081	A	$0(2)	241,274(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 Form 4 on June 30, 2026.

Remarks:

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

	/s/ Abinand Rangesh	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)