Tecogen (TGEN) director buys 12,723 shares after option exercise

Rhea-AI Filing Summary

TECOGEN INC. director Ahmed Ghoniem reported new share ownership through an option exercise and related stock purchase. He completed an open-market purchase of 12,723 shares of common stock at $0.786 per share and exercised stock options for 12,723 shares at the same price. Following these transactions, he holds 12,723 common shares directly and no remaining options from this grant.

Insider Trade Summary

Net Buyer: 12,723 shares ($10,000)

Net Buy 2 txns

Insider Ghoniem Ahmed

Role null

Bought 12,723 shs ($10K)

Type	Security	Shares	Price	Value
Exercise	Stock Option (Right to Buy)	12,723	$0.786	$10K
Purchase	Common Stock	12,723	$0.786	$10K

Holdings After Transaction: Stock Option (Right to Buy) — 0 shares (Direct, null); Common Stock — 12,723 shares (Direct, null)

Footnotes (1)

Key Figures

Open-market purchase: 12,723 shares at $0.786 Option exercise shares: 12,723 shares Option exercise price: $0.786 per share +2 more

5 metrics

Open-market purchase 12,723 shares at $0.786 Common Stock, transaction code P on April 24, 2026

Option exercise shares 12,723 shares Stock Option (Right to Buy), code M on April 24, 2026

Option exercise price $0.786 per share Conversion or exercise price for 12,723 option shares

Shares held after transaction 12,723 shares Total TECOGEN INC. common stock directly owned after transactions

Remaining options from this grant 0 shares Total shares following transaction for Stock Option (Right to Buy)

Key Terms

open-market purchase, Stock Option (Right to Buy), derivative exercise/conversion, net-buy

4 terms

open-market purchase financial

"transaction_action: "open-market purchase" for 12,723 common shares"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

Stock Option (Right to Buy) financial

"security_title: "Stock Option (Right to Buy)" with 12,723 underlying shares"

derivative exercise/conversion financial

"transaction_action: "derivative exercise/conversion" coded M for 12,723 shares"

net-buy financial

"transactionSummary shows netBuySellDirection as "net-buy" for these trades"

Form 4 Insider Transactions: What Each Field Means →

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^*

Ghoniem Ahmed

(Last) (First) (Middle)

76 TREBLE COVE RD

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/24/2026

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	04/24/2026		P		12,723	A	$0.786	12,723	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)	$0.786	04/24/2026		M			12,723	05/12/2016	05/12/2026	Stock Option (Right to Buy)	12,723	$0.786	0	D

Explanation of Responses:

Remarks:

	/s/ Ahmed Ghoniem	04/27/2026
	** 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)

FAQ

What insider transaction did Ahmed Ghoniem report at TECOGEN INC. (TGEN)?

Ahmed Ghoniem reported acquiring TECOGEN INC. common stock. He made an open-market purchase and exercised stock options tied to 12,723 shares, consolidating his position into directly held common shares at a price of $0.786 per share.

How many TECOGEN INC. (TGEN) shares did Ahmed Ghoniem acquire and at what price?

Ahmed Ghoniem acquired 12,723 shares of TECOGEN INC. common stock at $0.786 per share. The filing shows both an open-market purchase and a matching option exercise for 12,723 underlying shares at the same price.

What type of derivative transaction did Ahmed Ghoniem execute in TECOGEN INC. (TGEN)?

He executed a derivative exercise/conversion coded “M,” exercising stock options for 12,723 underlying shares at a conversion price of $0.786. After this exercise, the reported stock option position from this grant dropped to zero.

How many TECOGEN INC. (TGEN) shares does Ahmed Ghoniem hold after the reported transactions?

After the reported transactions, Ahmed Ghoniem directly holds 12,723 shares of TECOGEN INC. common stock. The derivative section shows zero shares remaining from the exercised stock option grant reflected in this Form 4 filing.

Was the TECOGEN INC. (TGEN) Form 4 transaction a buy or a sell?

The Form 4 reflects a net buy. It records one open-market purchase of 12,723 common shares and one derivative option exercise for 12,723 shares, with no reported sales or tax-withholding dispositions in this filing.