Director at TECOGEN (TGEN) makes open-market purchase of 5,000 shares

Rhea-AI Filing Summary

TECOGEN INC. director Susan B. Hirsch reported an open-market purchase of 5,000 shares of the company’s Common Stock. The shares were bought at a price of $3.73 per share. After this transaction, she directly owns 265,416 Common Stock shares.

Insider Trade Summary

Net Buyer: 5,000 shares ($18,650)

Net Buy 1 txn

Insider Hirsch Susan B

Role Director

Bought 5,000 shs ($19K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	5,000	$3.73	$19K

Holdings After Transaction: Common Stock — 265,416 shares (Direct)

Footnotes (1)

Key Figures

Shares purchased: 5,000 shares Purchase price: $3.73 per share Shares owned after transaction: 265,416 shares +1 more

4 metrics

Shares purchased 5,000 shares Open-market purchase of Common Stock

Purchase price $3.73 per share Price paid for Common Stock on transaction date

Shares owned after transaction 265,416 shares Direct ownership of TECOGEN Common Stock following purchase

Net buy/sell shares 5,000 shares Net result of reported Form 4 activity (net-buy)

Key Terms

open-market purchase, Common Stock, Form 4, net-buy

4 terms

open-market purchase financial

"transaction_action: "open-market purchase""

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.

Common Stock financial

"security_title: "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

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.

net-buy financial

"transactionSummary shows netBuySellDirection: "net-buy""

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^*

Hirsch Susan B

(Last) (First) (Middle)

280 OLD SOMERSET ROAD

(Street)

WATCHUNG NEW JERSEY 07069

(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)
04/13/2026

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	04/13/2026		P		5,000	A	$3.73	265,416	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:

Remarks:

	/s/ Susan F. Hirsch	04/14/2026
	** 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 TECOGEN (TGEN) director Susan B. Hirsch report?

Susan B. Hirsch reported an open-market purchase of 5,000 TECOGEN Common Stock shares. The transaction was recorded as a Form 4 filing and reflects a direct ownership increase in the company’s shares.

At what price did Susan B. Hirsch buy TECOGEN (TGEN) shares?

She purchased the TECOGEN Common Stock shares at $3.73 per share. This price reflects the cost paid in the open market on the reported transaction date in the Form 4 filing.

How many TECOGEN (TGEN) shares does Susan B. Hirsch own after this transaction?

Following the reported trade, Susan B. Hirsch directly owns 265,416 shares of TECOGEN Common Stock. This total includes the newly purchased 5,000 shares disclosed in the recent Form 4 filing.

Was the TECOGEN (TGEN) insider trade an open-market purchase or another type?

The filing classifies the transaction as an open-market purchase of Common Stock. This means the shares were acquired through regular market trading rather than as a grant, award, or private settlement.

Does the TECOGEN (TGEN) Form 4 show any stock option or derivative exercises?

The Form 4 data shows no derivative transactions or option exercises. All reported activity relates to a single non-derivative Common Stock purchase, with no remaining derivative positions listed in the filing excerpt.