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).

1. Name and Address of Reporting Person ^*

PANORA ROBERT A

(Last)

(First)

(Middle)

C/O TECOGEN, INC.

76 TREBLE COVE ROAD, BLDG 1

(Street)

N. BILLERICA

01862

(City)

(State)

(Zip)

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)
COO and President

3. Date of Earliest Transaction (Month/Day/Year)
06/03/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)
06/20/2025

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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	06/03/2025		S⁽¹⁾		26,000	D	$ 4.69	44,000	D
Common Stock	06/04/2025		S⁽¹⁾		31,000	D	$ 5	13,000	D
Common Stock	06/16/2025		M⁽²⁾		12,723	A	$ 0.786	25,723	D
Common Stock	06/16/2025		M⁽²⁾		30,000	A	$ 0.71	55,723	D
Common Stock	06/16/2025		M⁽²⁾		52,500	A	$ 1.1	108,223	D
Common Stock	06/18/2025		S⁽¹⁾		13,000	D	$ 5.03	95,223	D
Common Stock	06/23/2025		S⁽¹⁾		31,800	D	$ 6.36	63,423	D
Common Stock	06/24/2025		S⁽¹⁾		900	D	$ 6.86	62,523	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)
Stock Option (Right to Buy)	$ 0.786	06/16/2025		M⁽²⁾			12,723	05/12/2016	05/12/2026	Common Stock	12,723	$ 0.786	0	D
Stock Option (Right to Buy)	$ 0.71	06/16/2025		M⁽²⁾			30,000	⁽³⁾	07/09/2030	Common Stock	30,000	$ 0.71	100,000	D
Stock Option (Right to Buy)	$ 1.1	06/16/2025		M⁽²⁾			52,500	01/21/2023	01/21/2032	Common Stock	52,500	$ 1.1	0	D

Explanation of Responses:

1. Share sales effected to cover tax liabilities and other obligations. The June 2025 share sales were reported to the company on July 11, 2025.

2. Transaction code corrected

3. 100,000 shares of the 200,000 option shares granted pursuant to Stock Option Agreement dated 7/9/2020 vested on 6/30/2022 upon achievement of Adjusted EBITDA performance milestone.

	/s/ Robert A. Panora	07/14/2025
	** Signature of Reporting Person	Date
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