Tecogen CEO granted stock and option awards

Tecogen Inc. director and CEO Rangesh Abinand received new equity awards in the form of common stock and stock options.

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

Tecogen Inc. director and CEO Rangesh Abinand received new equity awards in the form of common stock and stock options. He was granted 174,081 shares of common stock as a restricted stock award at no cash cost, vesting 25% per year under the 2022 Stock Incentive Plan. He also received an incentive stock option covering 26,041 shares of common stock at an exercise price of $5.17 per share, which also vests 25% per year and is exercisable until June 26, 2036. Following these grants, his reported direct holdings are 174,081 common shares and options on 26,041 shares.

Insider Trade Summary

Grant/Award: 200,122 shares

Grant/Award 2 txns

Insider Rangesh Abinand

Role Chief Executive Officer

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (Right to Buy)	26,041	$5.17	$135K
Grant/Award	Common Stock	174,081	$0.00	$0.00

Holdings After Transaction: Stock Option (Right to Buy) — 26,041 contracts (Direct); Common Stock — 174,081 shares (Direct)

Footnotes (3)

1. F1. Restricted Stock Award pursuant to 2022 Stock Incentive Plan. Vests 25% per year.
2. F2. Vests 25% per year.
3. F3. Incentive Stock Option pursuant to 2022 Stock Incentive Plan.

Key Figures

Restricted stock award: 174,081 shares Restricted stock vesting: 25% per year Stock option grant size: 26,041 shares +5 more

8 metrics

Restricted stock award 174,081 shares Common stock grant on June 26, 2026

Restricted stock vesting 25% per year Time-based vesting schedule for 174,081 shares

Stock option grant size 26,041 shares Incentive stock option underlying common stock

Option exercise price $5.17 per share Incentive stock option strike price

Option vesting rate 25% per year Vesting schedule for 26,041-share option

Option expiration date June 26, 2036 Final exercise date for incentive stock option

Shares held after grant 174,081 shares Total common stock directly held following transaction

Options held after grant 26,041 options Total options directly held following transaction

Key Terms

Restricted Stock Award, 2022 Stock Incentive Plan, Incentive Stock Option, Vests 25% per year, +1 more

5 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."

Incentive Stock Option financial

"Incentive Stock Option pursuant to 2022 Stock Incentive Plan."

An incentive stock option is a type of employee benefit that gives a worker the right to buy company shares at a fixed price, with special tax advantages if the employee holds the shares for a required period. Think of it as a coupon to buy future shares at today’s price that can result in lower tax on the gain. Investors care because ISOs can dilute share count, align staff incentives with the stock price, and affect company compensation costs and the timing of potential share sales.

Vests 25% per year financial

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

Stock Option (Right to Buy) financial

"Stock Option (Right to Buy) listed as a derivative security."

FAQ

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

What equity awards did Tecogen (TGEN) CEO Rangesh Abinand receive?

Rangesh Abinand received 174,081 shares of Tecogen common stock as a restricted stock award and an incentive stock option on 26,041 shares at $5.17 per share, both vesting 25% per year under the 2022 Stock Incentive Plan.

How many Tecogen (TGEN) shares does the CEO hold after this Form 4?

After these awards, Rangesh Abinand is reported as directly holding 174,081 shares of Tecogen common stock and a stock option covering 26,041 underlying shares, according to the Form 4. These positions reflect equity-based compensation granted on June 26, 2026.

What are the vesting terms of the Tecogen (TGEN) CEO’s restricted stock award?

The restricted stock award of 174,081 Tecogen shares vests 25% per year, as disclosed in the footnotes. This means the CEO earns one quarter of the shares each year, subject to plan terms, rather than all shares becoming available immediately.

What are the key terms of the Tecogen (TGEN) CEO’s stock option grant?

The incentive stock option covers 26,041 Tecogen common shares at a $5.17 exercise price. It vests 25% per year and is exercisable until June 26, 2036, providing long-term equity exposure aligned with the company’s 2022 Stock Incentive Plan.

Is the Tecogen (TGEN) CEO’s Form 4 a market purchase or a compensation grant?

The Form 4 reflects compensation-related grants, not market purchases. Both the 174,081 restricted shares and the 26,041-share incentive stock option are coded as awards, with the common stock granted at no cash price and subject to time-based vesting conditions.

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

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Accepted by SEC EDGAR 06/30/2026 - 08:34 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)	X	Other (specify below)
	Chief Executive Officer		Chief Financial 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)

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	(1)	174,081(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
Stock Option (Right to Buy)(3)	$5.17	06/26/2026		A		26,041		06/26/2027(2)	06/26/2036	Common Stock	26,041	$5.17	26,041	D

Explanation of Responses:

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

2. Vests 25% per year.

3. Incentive Stock Option pursuant to 2022 Stock Incentive Plan.

Remarks:

	/s/ Abinand Rangesh	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)