Tecogen (TGEN) general counsel buys 10,000 shares in open market

Rhea-AI Filing Summary

Tecogen Inc. reported that its General Counsel and Secretary, John Kimball Whiting IV, made an open-market purchase of Common Stock. He bought 10,000 shares at $2.38 per share and now directly owns 22,612 shares. This filing highlights an increase in his personal stake in the company.

Insider Trade Summary

Net Buyer: 10,000 shares ($23,800)

Net Buy 1 txn

Insider Whiting John Kimball IV

Role General Counsel & Secretary

Bought 10,000 shs ($24K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	10,000	$2.38	$24K

Holdings After Transaction: Common Stock — 22,612 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^*

Whiting John Kimball IV

(Last) (First) (Middle)

76 TREBLE COVE ROAD

BLDG 1

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	General Counsel & Secretary

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/23/2026

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	03/23/2026		P		10,000	A	$2.38	22,612	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/ John K. Whiting, IV	03/23/2026
	** 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) disclose in this Form 4?

Tecogen disclosed that General Counsel and Secretary John Kimball Whiting IV bought 10,000 shares of Common Stock in an open-market purchase at $2.38 per share, increasing his direct ownership to 22,612 shares.

Who is the insider involved in Tecogen (TGEN)'s latest Form 4 filing?

The insider is John Kimball Whiting IV, General Counsel and Secretary of Tecogen Inc. He executed an open-market purchase of 10,000 Common Stock shares, raising his directly owned position to 22,612 shares according to the Form 4 data.

How many Tecogen (TGEN) shares did the insider buy and at what price?

John Kimball Whiting IV purchased 10,000 shares of Tecogen Common Stock at a price of $2.38 per share. This open-market transaction is classified as a purchase and increased his direct holdings to 22,612 shares.

What are the total Tecogen (TGEN) shares held by the insider after the transaction?

After the reported transaction, John Kimball Whiting IV directly owns 22,612 Tecogen Common Stock shares. This total reflects his prior holdings plus the 10,000 shares acquired in the open-market purchase disclosed in the Form 4 filing.

Is the Tecogen (TGEN) insider transaction classified as a buy or sell?

The transaction is classified as a buy. The Form 4 identifies it as an open-market purchase with transaction code “P,” showing 10,000 Tecogen Common Stock shares purchased at $2.38 per share and no shares sold in this filing.

Does the Tecogen (TGEN) Form 4 involve any derivative securities or options?

No, the reported activity involves only non-derivative Common Stock. The derivativeSummary section is empty, indicating no options, warrants, or other derivative securities were exercised, converted, or otherwise transacted in this particular Form 4 filing.