[Form 4/A] Tecogen Inc. Amended Insider Trading Activity

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 11 txns

Insider PANORA ROBERT A

Role COO and President

Sold 102,700 shs ($551K)

Approx. gross sale proceeds $551K

Approx. exercise cost $89K

Type	Security	Shares	Price	Value
Sale	Common Stock	900	$6.86	$6K
Sale	Common Stock	31,800	$6.36	$202K
Sale	Common Stock	13,000	$5.03	$65K
Exercise	Stock Option (Right to Buy)	12,723	$0.786	$10K
Exercise	Stock Option (Right to Buy)	30,000	$0.71	$21K
Exercise	Stock Option (Right to Buy)	52,500	$1.10	$58K
Exercise	Common Stock	12,723	$0.786	$10K
Exercise	Common Stock	30,000	$0.71	$21K
Exercise	Common Stock	52,500	$1.10	$58K
Sale	Common Stock	31,000	$5.00	$155K
Sale	Common Stock	26,000	$4.69	$122K

Holdings After Transaction: Stock Option (Right to Buy) — 100,000 contracts (Direct); Common Stock — 62,523 shares (Direct)

Footnotes (3)

1. F1. 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. F2. Transaction code corrected
3. F3. 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.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 07/14/2025 - 09:02 AM EDT Learn about SEC filing dates

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^*

PANORA ROBERT A

(Last) (First) (Middle)

C/O TECOGEN, INC.

76 TREBLE COVE ROAD, BLDG 1

(Street)

N. BILLERICA MA 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)
			Code	V	Amount	(A) or (D)	Price
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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
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.

Remarks:

	/s/ Robert A. Panora	07/14/2025
	** 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.