Tecogen (TGEN) director Susan Hirsch purchases 10,000 common shares in open market

Rhea-AI Filing Summary

TECOGEN INC. director Susan B. Hirsch reported an open-market purchase of 10,000 shares of common stock at $2.54 per share. Following this buy, she directly holds 260,416 common shares, increasing her personal stake in the company.

Insider Trade Summary

Net Buyer: 10,000 shares ($25,400)

Net Buy 1 txn

Insider Hirsch Susan B

Role Director

Bought 10,000 shs ($25K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	10,000	$2.54	$25K

Holdings After Transaction: Common Stock — 260,416 shares (Direct)

Footnotes (1)

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)
03/27/2026

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	03/27/2026		P		10,000	A	$2.54	260,416	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	03/27/2026
	** 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 TECOGEN INC. (TGEN) report for Susan B. Hirsch?

TECOGEN INC. reported that director Susan B. Hirsch made an open-market purchase of 10,000 shares of common stock. The shares were bought at a price of $2.54 per share, increasing her direct ownership position in the company.

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

Susan B. Hirsch bought TECOGEN INC. common stock at $2.54 per share. This was an open-market purchase of 10,000 shares, indicating she chose to increase her stake at that specific trading price.

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

After the reported transaction, Susan B. Hirsch directly owns 260,416 shares of TECOGEN INC. common stock. This total reflects her position following the open-market purchase of 10,000 additional shares disclosed in the Form 4 filing.

What type of Form 4 transaction did TECOGEN INC. (TGEN) disclose for Susan B. Hirsch?

The Form 4 shows an open-market purchase of common stock by director Susan B. Hirsch. The transaction code was “P,” indicating a purchase, covering 10,000 shares at a price of $2.54 per share.

Does the TECOGEN INC. (TGEN) Form 4 for Susan B. Hirsch involve derivatives or options?

The reported Form 4 transaction for Susan B. Hirsch involves only non-derivative common stock. The filing shows a direct open-market purchase of 10,000 common shares and indicates no accompanying derivative or options transactions in this disclosure.