Tecogen (TGEN) director adds 5,000 shares in open-market buy

Rhea-AI Filing Summary

Tecogen Inc. director Earl Lewis reported an open-market purchase of 5,000 shares of Tecogen common stock at an average price of $2.5192 per share. The filing shows that, following this transaction, Lewis directly or through a trust associated with him holds 1,011,006 Tecogen shares.

Insider Trade Summary

Net Buyer: 5,000 shares ($12,596)

Net Buy 1 txn

Insider Lewis Earl

Role Director

Bought 5,000 shs ($13K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	5,000	$2.5192	$13K

Holdings After Transaction: Common Stock — 1,011,006 shares (Direct)

Footnotes (1)

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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^*

Lewis Earl

(Last) (First) (Middle)

C/O TECOGEN INC.

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)

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		5,000(1)	A	$2.5192	1,011,006	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:

1. Shares acquired by trust

Remarks:

	/s/ Earl R. Lewis	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 (TGEN) report for Earl Lewis?

Tecogen director Earl Lewis reported buying 5,000 shares of common stock in an open-market transaction. The purchase was at an average price of $2.5192 per share and increased his directly or trust-associated holdings to 1,011,006 shares.

At what price did Earl Lewis buy Tecogen (TGEN) shares?

Earl Lewis purchased 5,000 Tecogen common shares at an average price of $2.5192 per share. This open-market transaction is detailed in the Form 4 and reflects the cost per share he paid on the transaction date.

How many Tecogen (TGEN) shares does Earl Lewis hold after this Form 4?

After the reported purchase, Earl Lewis holds 1,011,006 Tecogen common shares. The Form 4 indicates this total includes the newly acquired 5,000 shares, which were noted as being acquired by a trust associated with him.

Was the Tecogen (TGEN) insider transaction a buy or a sell?

The transaction was a buy. The Form 4 shows Earl Lewis executed an open-market purchase of 5,000 Tecogen common shares, coded as a "P" transaction and described as a purchase in an open market or private transaction.

What does the trust reference mean in the Tecogen (TGEN) Form 4 footnote?

A footnote states the shares were "acquired by trust," indicating the 5,000 purchased shares are held through a trust associated with Earl Lewis. The filing still reports these as his direct ownership for Section 16 reporting purposes.