Key facts
- This page summarizes Stephen Lafaille's Form 4 filing for TECOGEN INC. (TGEN).
- 13 reported transactions and 4 derivative rows are listed below.
- Accepted by SEC: 24 Jun 2025, 17:41.
Stephen Lafaille - 03 Mar 2025 Form 4 Insider Report for TECOGEN INC. (TGEN)
- Reporting relationship
- VP of Business Development
- Issuer ticker
- TGEN
- Reported as of
- 03 Mar 2025
- Net transaction value
- -$344,800
- SEC form
- 4
- Accepted by SEC
- 24 Jun 2025, 17:41:57 UTC
- Prior SEC filing
- 24 Jun 2025
- Next SEC filing
- 28 Jul 2025
- Source filing
- View source filing
- Reporting owner signature
- /s/ Stephen Lafaille
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Stephen Lafaille filed Form 4 for TECOGEN INC. (TGEN) on 24 Jun 2025.
Change
- Previous filing in this sequence was filed on 24 Jun 2025.
- Current net transaction value: -$344,800.
Research use
- This tells you what this filing adds before you inspect full transaction and derivative tables.
- You can trace every row back to the original SEC filing document.
Evidence
Filed on Form 4
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0002074096
Primary reporting owner
Lafaille Stephen
- Relationship
- VP of Business Development
- Address
- 76 TREBLE COVE ROAD, NORTH BILLERICA
- Signature
- /s/ Stephen Lafaille
- Signature date
- 24 Jun 2025
Reported non-derivative transactions
Shares, units, or other non-derivative securities reported in this filing.
TGEN
transaction
Common Stock
Purchase
- Transaction value
- $1,000
- Shares
- +400
- Change %
- Price
- $2.50
- Shares after
- 400
- Date
- 03 Mar 2025
- Ownership
- Direct
TGEN
transaction
Common Stock
Exercise of in-the-money or at-the-money derivative security
- Transaction value
- $7,100
- Shares
- +10,000
- Change %
- +2500%
- Price
- $0.7100
- Shares after
- 10,400
- Date
- 03 Jun 2025
- Ownership
- Direct
- Footnotes
- F1
TGEN
transaction
Common Stock
Sale
- Transaction value
- $48,800
- Shares
- -10,000
- Change %
- -96%
- Price
- $4.88
- Shares after
- 400
- Date
- 03 Jun 2025
- Ownership
- Direct
- Footnotes
- F2
TGEN
transaction
Common Stock
Exercise of in-the-money or at-the-money derivative security
- Transaction value
- $10,650
- Shares
- +15,000
- Change %
- +3750%
- Price
- $0.7100
- Shares after
- 15,400
- Date
- 04 Jun 2025
- Ownership
- Direct
- Footnotes
- F1
TGEN
transaction
Common Stock
Sale
- Transaction value
- $75,000
- Shares
- -15,000
- Change %
- -97%
- Price
- $5.00
- Shares after
- 400
- Date
- 04 Jun 2025
- Ownership
- Direct
- Footnotes
- F3
TGEN
transaction
Common Stock
Exercise of in-the-money or at-the-money derivative security
- Transaction value
- $27,500
- Shares
- +25,000
- Change %
- +6250%
- Price
- $1.10
- Shares after
- 25,400
- Date
- 06 Jun 2025
- Ownership
- Direct
- Footnotes
- F4
TGEN
transaction
Common Stock
Sale
- Transaction value
- $149,500
- Shares
- -25,000
- Change %
- -98%
- Price
- $5.98
- Shares after
- 400
- Date
- 06 Jun 2025
- Ownership
- Direct
- Footnotes
- F5
TGEN
transaction
Common Stock
Exercise of in-the-money or at-the-money derivative security
- Transaction value
- $11,000
- Shares
- +10,000
- Change %
- +2500%
- Price
- $1.10
- Shares after
- 10,400
- Date
- 23 Jun 2025
- Ownership
- Direct
- Footnotes
- F4
TGEN
transaction
Common Stock
Sale
- Transaction value
- $72,500
- Shares
- -10,000
- Change %
- -96%
- Price
- $7.25*
- Shares after
- 400
- Date
- 23 Jun 2025
- Ownership
- Direct
Reported derivative securities
Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.
TGEN
transaction
Derivative
Stock Options (Right to Buy)
Exercise of in-the-money or at-the-money derivative security
- Transaction value
- $7,100
- Shares
- -10,000
- Change %
- -20%
- Price
- $0.7100
- Shares after
- 40,000
- Date
- 03 Jun 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 50,000
- Exercise price
- $0.7100
- Footnotes
- F6
TGEN
transaction
Derivative
Stock Options (Right to Buy)
Exercise of in-the-money or at-the-money derivative security
- Transaction value
- $10,650
- Shares
- -15,000
- Change %
- -38%
- Price
- $0.7100
- Shares after
- 25,000
- Date
- 04 Jun 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 40,000
- Exercise price
- $0.7100
- Footnotes
- F6
TGEN
transaction
Derivative
Stock Options (Right to Buy)
Exercise of in-the-money or at-the-money derivative security
- Transaction value
- $27,500
- Shares
- -25,000
- Change %
- -48%
- Price
- $1.10
- Shares after
- 27,500
- Date
- 06 Jun 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 52,500
- Exercise price
- $1.10
- Footnotes
- F7
TGEN
transaction
Derivative
Stock Options (Right to Buy)
Exercise of in-the-money or at-the-money derivative security
- Transaction value
- $11,000
- Shares
- -10,000
- Change %
- -36%
- Price
- $1.10
- Shares after
- 17,500
- Date
- 23 Jun 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 25,000
- Exercise price
- $1.10
- Footnotes
- F7
* marks a reported price that did not pass the local price check.
Additional SEC filing notes
Filing notes and footnotes
Explanation of responses 7 footnotes
Footnote F1
Shares acquired pursuant to exercise of Stock Option Agreement dated 7/9/2020
Footnote F2
Multiple share sales between $4.75 and $5.25 per share
Footnote F3
10,000 shares sold for $4.90 per share, and 5,000 shares sold for $5.10 per share
Footnote F4
Shares acquired pursuant to stock option agreement dated 1/21/2022
Footnote F5
Multiple share sales between $5.85 and $6.10
Footnote F6
Vests 50% upon achievement of Adjusted EBITDA goal of 2% of revenue in two consecutive quarters, and 50% upon achievement of Adjusted EBITDA goal of 3% of revenue in four consecutive quarters
Footnote F7
Vests 50% per year