Tecogen (TGEN) CAO Roger Deschenes buys 10,000 shares in open market

Rhea-AI Filing Summary

TECOGEN INC. Chief Accounting Officer Roger P. Deschenes bought additional company stock in the open market. On March 20, 2026, he purchased 10,000 shares of common stock at $2.23 per share. Following this transaction, he directly holds 52,962 shares of Tecogen common stock.

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

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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^*

Deschenes Roger P.

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/20/2026

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	03/20/2026		P		10,000	A	$2.23	52,962	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/ Roger P. Deschenes	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) report for Roger P. Deschenes?

Tecogen reported that CAO Roger P. Deschenes bought 10,000 shares of common stock. The shares were purchased in an open-market transaction at $2.23 per share, increasing his direct ownership to 52,962 Tecogen shares after the trade.

When did Tecogen (TGEN) CAO Roger P. Deschenes buy additional shares?

Roger P. Deschenes bought additional Tecogen shares on March 20, 2026. The Form 4 shows an open-market purchase of 10,000 common shares at $2.23 each, reflecting a direct increase in his personal stake in the company.

How many Tecogen (TGEN) shares does Roger P. Deschenes own after this Form 4 transaction?

After the reported transaction, Roger P. Deschenes directly owns 52,962 Tecogen shares. This figure reflects his position following the open-market purchase of 10,000 common shares at $2.23 each disclosed in the Form 4 filing.

What price did Tecogen (TGEN) insider Roger P. Deschenes pay per share?

Roger P. Deschenes paid $2.23 per share for Tecogen common stock. The Form 4 specifies a single open-market purchase of 10,000 shares at this price, clearly identifying it as a standard market transaction rather than an option exercise or grant.

Is the Tecogen (TGEN) insider transaction by Roger P. Deschenes a purchase or sale?

The transaction is a purchase of Tecogen shares by Roger P. Deschenes. The Form 4 classifies it with code P, described as an open-market purchase of 10,000 common shares at $2.23, increasing his directly held position.