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TECOGEN INC.

TGEN Net buying

CIK 0001537435 #4338 in the set updated 20 Sep 2026

Bought (120 mo)

$1.31M

out of their own pocket, the only kind of buying there is

Sold (120 mo)

$345.80K

$0.00 on a plan · $345.80K straight out of an exercise

Sold at will

$0.00

0 of 4 sales

Net

+$964.64K

+$1.31M against sales at will

By person

11 insiders · 155 transactions

0.6×

Abinand Rangesh holds only 0.6 times base salary in stock. $136.83K of shares against $210.00K in salary for 2025.

Salary from the company's own proxy. The shares are what Abinand Rangesh last reported holding, valued at $0.79, the price Common Stock was last bought or sold at on the open market here, on 24 Apr 2026.

Insider

Role

Bought

Sold

Net

Holding

Of company

Worth

Change

Hatsopoulos John

Director

$672.72K (86)

—

+$672.72K

1,038,951

3.44%

$816.62K

+520.2%

Lafaille Stephen

VP of Business Development

$1.00K (1)

$345.80K (4) scheduled

−$344.80K

29,013

0.0961%

$22.80K

—

Lewis Earl

Director

$298.47K (32)

—

+$298.47K

1,646,006

5.45%

$1.29M

+102.2%

MAXWELL CHARLEST

Director

$215.15K (10)

—

+$215.15K

224,590

0.7440%

$176.53K

+327.8%

Hirsch Susan B

Director

$48.63K (3)

—

+$48.63K

265,416

0.8792%

$208.62K

+8.1%

Whiting John Kimball IV

General Counsel & Secretary

$23.80K (1)

—

+$23.80K

19,342

0.0641%

$15.20K

—

Deschenes Roger P.

CAO

$22.30K (1)

—

+$22.30K

29,013

0.0961%

$22.80K

—

Rangesh Abinand

Chief Executive Officer

$11.05K (7)

—

+$11.05K

174,081

0.5767%

$136.83K

—

Ghoniem Ahmed

Director

$10.00K (1)

—

+$10.00K

12,723

0.0421%

$10.00K

—

Benjamin Locke M.

CEO

$7.32K (2)

—

+$7.32K

8,836

0.0293%

$6.95K

+158.5%

Panora Robert

COO and President

—

9,671

0.0320%

$7.60K

—

Individual transactions

Insider

Date

Role

Action

Price

Amount

Lafaille Stephen

23 Jun 2025

VP of Business Development

Sold after exercise

10,000

$7.25

$72.50K

Lafaille Stephen

6 Jun 2025

VP of Business Development

Sold after exercise

25,000

$5.98

$149.50K

Lafaille Stephen

4 Jun 2025

VP of Business Development

Sold after exercise

15,000

$5.00

$75.00K

Lafaille Stephen

3 Jun 2025

VP of Business Development

Sold after exercise

10,000

$4.88

$48.80K

Show all 155 transactions →

What was left out

Form 4 filings counted 160

Amendments (4/A) skipped 14

Filings about a different issuer 0

Unreadable filings 0

Joint filings 0

Sales on a Rule 10b5-1 plan 0

Sales straight out of an exercise 4

Sales at will 0

Transactions with no price 0

Shares from compensation/vesting 1,240,593

History held since 14 Dec 2016