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

TECOGEN INC. director Earl Lewis reported an open-market purchase of the company’s common stock through a trust.

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Rhea-AI Filing Summary

TECOGEN INC. director Earl Lewis reported an open-market purchase of the company’s common stock through a trust. The trust acquired 5,000 shares at an average price of $2.8817 per share on March 26, 2026. Following this transaction, holdings associated with Lewis total 1,006,006 shares of common stock, indicating a relatively small incremental increase to an already substantial position.

Insider Trade Summary

Net Buyer: 5,000 shares

Net Buy 1 txn

Insider Lewis Earl

Role Director

Bought 5,000 shs ($14K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	5,000	$2.8817	$14K

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

Footnotes (1)

F1. Shares acquired by a trust

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did TECOGEN INC. (TGEN) disclose for Earl Lewis?

TECOGEN INC. reported that a trust associated with director Earl Lewis bought 5,000 shares of common stock in an open-market transaction. The shares were purchased at an average price of $2.8817 per share, increasing his reported holdings in the company.

How many TECOGEN INC. (TGEN) shares were purchased in the latest Form 4?

The Form 4 shows a purchase of 5,000 TECOGEN INC. common shares. These were acquired in an open-market transaction, adding to the director’s previously held stake and modestly increasing the overall number of shares associated with him.

At what price were the new TECOGEN INC. (TGEN) shares acquired?

The newly acquired TECOGEN INC. shares were purchased at an average price of $2.8817 per share. This reflects the per-share cost in the reported open-market transaction by a trust associated with director Earl Lewis on March 26, 2026.

What are Earl Lewis’s total reported TECOGEN INC. (TGEN) holdings after this transaction?

After the 5,000-share purchase, holdings associated with Earl Lewis total 1,006,006 TECOGEN INC. common shares. This figure includes the newly acquired shares and represents his reported position immediately following the disclosed transaction.

Was the TECOGEN INC. (TGEN) insider transaction made directly by Earl Lewis?

The filing notes that the 5,000 TECOGEN INC. shares were "acquired by a trust." This indicates the transaction was executed through a trust associated with director Earl Lewis rather than directly in his personal name.

Does the TECOGEN INC. (TGEN) Form 4 include any derivative securities activity?

The Form 4 data show no derivative security transactions for this event. The filing reports only a non-derivative common stock purchase, with no listed option exercises, conversions, or other derivative-related entries in the summarized information.

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Accepted by SEC EDGAR 03/27/2026 - 12:10 PM EDT

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)
03/26/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	03/26/2026		P		5,000⁽¹⁾	A	$2.8817	1,006,006	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Shares acquired by a 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)

Source: View Original Filing on SEC EDGAR