Insider trading activities (stock purchases, sales, and option exercises) reported by insiders of Tecogen Inc. (TGEN) since 2015 are shown in Table 1 and Table 2. Table 1 shows the monthly insider trading data of Tecogen Inc.. Table 2 shows the detailed insider transactions. This company's CIK number is 1537435.
Total stock buying since 2015: $1,198,471.
Total stock sales since 2015: $345,800.
Total stock option exercises since 2015: $0.
| Insider Buying | Insider Sales | Option Exercises | ||||
|---|---|---|---|---|---|---|
| Year | Shares | Value | Shares | Value | Shares | Value |
| 2025 | 400 | $1,000 | 60,000 | $345,800 | 0 | $0 |
| 2024 | 391,152 | $288,064 | 0 | $0 | 0 | $0 |
| 2023 | 584,815 | $538,403 | 0 | $0 | 0 | $0 |
| 2022 | 73,183 | $79,173 | 0 | $0 | 0 | $0 |
| 2021 | 15,000 | $28,200 | 0 | $0 | 0 | $0 |
| 2020 | 38,711 | $36,743 | 0 | $0 | 0 | $0 |
| 2017 | 39,000 | $151,420 | 0 | $0 | 0 | $0 |
| 2016 | 195,885 | $68,999 | 0 | $0 | 0 | $0 |
| 2015 | 1,500 | $6,469 | 0 | $0 | 0 | $0 |
| Trading Period | Insider Buying | Insider Sales | Option Exercises | |||
|---|---|---|---|---|---|---|
| year-month | Shares | Value | Shares | Value | Shares | Value |
| 2025-06 | 0 | $0 | 60,000 | $345,800 | 0 | $0 |
| 2025-03 | 400 | $1,000 | 0 | $0 | 0 | $0 |
| 2024-11 | 100,000 | $71,000 | 0 | $0 | 0 | $0 |
| 2024-09 | 20,000 | $16,980 | 0 | $0 | 0 | $0 |
| 2024-08 | 10,000 | $8,950 | 0 | $0 | 0 | $0 |
| 2024-07 | 30,000 | $20,400 | 0 | $0 | 0 | $0 |
| 2024-05 | 55,000 | $42,827 | 0 | $0 | 0 | $0 |
| 2024-04 | 32,612 | $22,348 | 0 | $0 | 0 | $0 |
| 2024-03 | 4,388 | $3,071 | 0 | $0 | 0 | $0 |
| 2024-01 | 139,152 | $102,488 | 0 | $0 | 0 | $0 |
| 2023-12 | 100,000 | $82,900 | 0 | $0 | 0 | $0 |
| 2023-11 | 4,100 | $3,464 | 0 | $0 | 0 | $0 |
| 2023-10 | 136,000 | $112,125 | 0 | $0 | 0 | $0 |
| 2023-09 | 40,580 | $39,005 | 0 | $0 | 0 | $0 |
| 2023-08 | 94,567 | $96,824 | 0 | $0 | 0 | $0 |
| 2023-06 | 37,000 | $37,836 | 0 | $0 | 0 | $0 |
| 2023-05 | 16,649 | $16,755 | 0 | $0 | 0 | $0 |
| 2023-03 | 155,919 | $149,494 | 0 | $0 | 0 | $0 |
| 2022-10 | 20,000 | $19,500 | 0 | $0 | 0 | $0 |
| 2022-09 | 28,183 | $29,453 | 0 | $0 | 0 | $0 |
| 2022-08 | 25,000 | $30,220 | 0 | $0 | 0 | $0 |
| 2021-08 | 15,000 | $28,200 | 0 | $0 | 0 | $0 |
| 2020-06 | 11,711 | $9,603 | 0 | $0 | 0 | $0 |
| 2020-04 | 27,000 | $27,140 | 0 | $0 | 0 | $0 |
| Trade Date | Insider Name | Trade Type | Shares | Price ($) | Value ($) |
|---|---|---|---|---|---|
| 2025-06-23 | Lafaille Stephen (VP of Business Development) | Sale | 10,000 | 7.25 | 72,500 |
| 2025-06-06 | Lafaille Stephen (VP of Business Development) | Sale | 25,000 | 5.98 | 149,500 |
| 2025-06-04 | Lafaille Stephen (VP of Business Development) | Sale | 15,000 | 5.00 | 75,000 |
| 2025-06-03 | Lafaille Stephen (VP of Business Development) | Sale | 10,000 | 4.88 | 48,800 |
| 2025-03-03 | Lafaille Stephen (VP of Business Development) | Buy | 400 | 2.50 | 1,000 |
| 2024-11-22 | Lewis Earl R (Director) | Buy | 100,000 | .71 | 71,000 |
| 2024-09-27 | Hatsopoulos John | Buy | 10,000 | .84 | 8,380 |
| 2024-09-25 | Hatsopoulos John | Buy | 10,000 | .86 | 8,600 |
| 2024-08-19 | Hatsopoulos John | Buy | 10,000 | .90 | 8,950 |
| 2024-07-15 | Lewis Earl R (Director) | Buy | 20,000 | .68 | 13,600 |
| 2024-05-29 | Hatsopoulos John | Buy | 10,000 | .80 | 8,000 |
| 2024-05-28 | Hatsopoulos John | Buy | 1,265 | .80 | 1,012 |
| 2024-05-24 | Hatsopoulos John | Buy | 8,735 | .80 | 6,988 |
| 2024-05-22 | Hatsopoulos John | Buy | 3,200 | .79 | 2,528 |
| 2024-05-21 | Hatsopoulos John | Buy | 13,800 | .79 | 10,902 |
| 2024-05-16 | Hatsopoulos John | Buy | 3,000 | .75 | 2,247 |
| 2024-05-15 | Hatsopoulos John | Buy | 10,000 | .74 | 7,400 |
| 2024-05-01 | Lewis Earl R (Director) | Buy | 5,000 | .75 | 3,750 |
| 2024-04-24 | Hatsopoulos John | Buy | 5,000 | .67 | 3,355 |
| 2024-04-24 | Lewis Earl R (Director) | Buy | 10,000 | .68 | 6,800 |
| 2024-04-23 | Hatsopoulos John | Buy | 6,000 | .68 | 4,086 |
| 2024-04-16 | Hatsopoulos John | Buy | 1,000 | .68 | 679 |
| 2024-04-15 | Hatsopoulos John | Buy | 1,000 | .70 | 700 |
| 2024-04-12 | Hatsopoulos John | Buy | 1,000 | .70 | 700 |
| 2024-04-11 | Hatsopoulos John | Buy | 1,000 | .70 | 700 |
| 2024-04-09 | Hatsopoulos John | Buy | 1,000 | .70 | 700 |
| 2024-04-08 | Hatsopoulos John | Buy | 1,000 | .70 | 700 |
| 2024-04-01 | Hatsopoulos John | Buy | 5,612 | .70 | 3,928 |
| 2024-03-28 | Hatsopoulos John | Buy | 2,388 | .70 | 1,671 |
| 2024-03-27 | Hatsopoulos John | Buy | 2,000 | .70 | 1,400 |
| 2024-01-24 | Lewis Earl R (Director) | Buy | 9,152 | .78 | 7,138 |
| 2024-01-23 | Lewis Earl R (Director) | Buy | 10,000 | .68 | 6,800 |
| 2024-01-22 | Hatsopoulos John | Buy | 10,000 | .77 | 7,700 |
| 2024-01-18 | Hatsopoulos John | Buy | 10,000 | .73 | 7,350 |
| 2024-01-16 | Hatsopoulos John | Buy | 100,000 | .73 | 73,500 |
| 2023-12-27 | Hatsopoulos John | Buy | 25,000 | .80 | 20,000 |
| 2023-12-22 | Hatsopoulos John | Buy | 25,000 | .80 | 20,000 |
| 2023-12-14 | Hatsopoulos John | Buy | 50,000 | .86 | 42,900 |
| 2023-11-20 | Hatsopoulos John | Buy | 4,000 | .84 | 3,380 |
| 2023-11-14 | Hatsopoulos John | Buy | 100 | .84 | 84 |
| 2023-10-19 | Hirsch Susan B (Director) | Buy | 5,000 | .92 | 4,575 |
| 2023-10-18 | Lewis Earl R (Director) | Buy | 25,000 | .91 | 22,750 |
| 2023-10-17 | Hatsopoulos John | Buy | 50,000 | .80 | 40,000 |
| 2023-10-12 | Hatsopoulos John | Buy | 50,000 | .80 | 40,000 |
| 2023-10-09 | Lewis Earl R (Director) | Buy | 4,000 | .80 | 3,200 |
| 2023-09-29 | Hatsopoulos John | Buy | 2,000 | .98 | 1,960 |
| 2023-09-27 | Hatsopoulos John | Buy | 1,380 | .91 | 1,255 |
| 2023-09-26 | Hatsopoulos John | Buy | 2,000 | .92 | 1,840 |
| 2023-09-19 | Hatsopoulos John | Buy | 5,000 | .91 | 4,550 |
| 2023-09-08 | Lewis Earl R | Buy | 10,000 | .95 | 9,500 |
| 2023-09-07 | Hatsopoulos John | Buy | 200 | 1.00 | 200 |
| 2023-09-05 | Hatsopoulos John | Buy | 10,000 | .97 | 9,700 |
| 2023-09-05 | Lewis Earl R | Buy | 10,000 | 1.00 | 10,000 |
| 2023-08-30 | Rangesh Abinand (Chief Executive Officer) | Buy | 800 | 1.02 | 816 |
| 2023-08-23 | Rangesh Abinand (Chief Executive Officer) | Buy | 200 | 1.02 | 204 |
| 2023-08-22 | Hatsopoulos John | Buy | 5,000 | 1.12 | 5,600 |
| 2023-08-17 | Hatsopoulos John | Buy | 23,370 | 1.04 | 24,280 |
| 2023-08-15 | Rangesh Abinand (Chief Executive Officer) | Buy | 1 | .95 | 0 |
| 2023-08-15 | Hatsopoulos John | Buy | 25,000 | 1.00 | 25,000 |
| 2023-08-14 | Lewis Earl R | Buy | 1,500 | 1.00 | 1,500 |
| 2023-06-26 | Hatsopoulos John | Buy | 1,000 | .96 | 960 |
| 2023-06-20 | Rangesh Abinand (Chief Executive Officer) | Buy | 1,500 | 1.04 | 1,560 |
| 2023-06-20 | Hatsopoulos John | Buy | 3,000 | 1.00 | 3,000 |
| 2023-06-15 | Hatsopoulos John | Buy | 5,000 | 1.11 | 5,550 |
| 2023-06-08 | Hatsopoulos John | Buy | 500 | 1.09 | 546 |
| 2023-06-07 | Hatsopoulos John | Buy | 10,000 | 1.00 | 9,990 |
| 2023-06-06 | Hatsopoulos John | Buy | 8,000 | 1.07 | 8,140 |
| 2023-06-02 | Hatsopoulos John | Buy | 1,000 | 1.09 | 1,090 |
| 2023-05-26 | Hatsopoulos John | Buy | 1,000 | 1.17 | 1,170 |
| 2023-05-25 | Hatsopoulos John | Buy | 1,000 | 1.17 | 1,170 |
| 2023-05-23 | Hatsopoulos John | Buy | 1,000 | 1.17 | 1,170 |
| 2023-05-15 | Hatsopoulos John | Buy | 3,649 | 1.00 | 3,645 |
| 2023-05-15 | Lewis Earl R | Buy | 10,000 | .96 | 9,600 |
| 2023-03-29 | Lewis Earl R | Buy | 20,000 | 1.18 | 23,500 |
| 2023-03-28 | Hatsopoulos John | Buy | 17,700 | 1.00 | 17,700 |
| 2023-03-28 | Lewis Earl R | Buy | 6,000 | 1.02 | 6,132 |
| 2023-03-27 | Hatsopoulos John | Buy | 11,419 | 1.00 | 11,396 |
| 2023-03-27 | Lewis Earl R | Buy | 806 | .98 | 793 |
| 2023-03-24 | Hatsopoulos John | Buy | 50,000 | .92 | 46,000 |
| 2023-03-24 | Lewis Earl R | Buy | 8,194 | .93 | 7,579 |
| 2023-03-22 | Lewis Earl R | Buy | 5,000 | .87 | 4,350 |
| 2023-03-21 | Hatsopoulos John | Buy | 10,000 | .88 | 8,800 |
| 2023-03-20 | Rangesh Abinand (Chief Executive Officer) | Buy | 1,800 | .87 | 1,569 |
| 2023-03-20 | Hatsopoulos John | Buy | 10,000 | .84 | 8,400 |
| 2023-03-20 | Lewis Earl R | Buy | 15,000 | .89 | 13,275 |
| 2022-10-19 | Hatsopoulos John | Buy | 5,000 | 1.00 | 5,000 |
| 2022-10-17 | Hatsopoulos John | Buy | 5,000 | .98 | 4,900 |
| 2022-10-11 | Hatsopoulos John | Buy | 5,000 | .96 | 4,800 |
| 2022-10-10 | Hatsopoulos John | Buy | 5,000 | .96 | 4,800 |
| 2022-09-29 | Lewis Earl R | Buy | 5,000 | .97 | 4,850 |
| 2022-09-28 | Lewis Earl R | Buy | 8,183 | .95 | 7,773 |
| 2022-09-08 | Hatsopoulos John | Buy | 5,000 | 1.17 | 5,830 |
| 2022-09-02 | Hatsopoulos John | Buy | 5,000 | 1.10 | 5,500 |
| 2022-09-01 | Hatsopoulos John | Buy | 5,000 | 1.10 | 5,500 |
| 2022-08-31 | Hatsopoulos John | Buy | 5,000 | 1.10 | 5,500 |
| 2022-08-25 | Hatsopoulos John | Buy | 5,000 | 1.25 | 6,250 |
| 2022-08-24 | Hatsopoulos John | Buy | 5,000 | 1.23 | 6,170 |
| 2022-08-23 | Hatsopoulos John | Buy | 5,000 | 1.25 | 6,250 |
| 2022-08-22 | Hatsopoulos John | Buy | 5,000 | 1.21 | 6,050 |
| 2021-08-17 | Lewis Earl R | Buy | 15,000 | 1.88 | 28,200 |
| 2020-06-08 | Lewis Earl R | Buy | 11,711 | .82 | 9,603 |
| 2020-04-23 | Hatsopoulos John | Buy | 25,000 | 1.00 | 25,100 |
| 2020-04-21 | Benjamin Locke M. (CEO) | Buy | 2,000 | 1.02 | 2,040 |
| 2017-11-14 | Benjamin Locke M. (Co-CEO) | Buy | 2,000 | 2.64 | 5,280 |
| 2017-01-06 | Maxwell Charlest | Buy | 25,000 | 4.00 | 100,000 |
| 2017-01-04 | Maxwell Charlest | Buy | 12,000 | 3.85 | 46,140 |
| 2016-12-30 | Maxwell Charlest | Buy | 900 | 3.98 | 3,577 |
| 2016-12-29 | Maxwell Charlest | Buy | 15,200 | 3.88 | 58,976 |
| 2016-12-28 | Maxwell Charlest | Buy | 69 | 3.92 | 270 |
| 2016-12-23 | Maxwell Charlest | Buy | 1,600 | 3.86 | 6,176 |
| 2016-04-22 | Hatsopoulos John (Chief Executive Officer) | Buy | 127,226 | .00 | 0 |
| 2016-04-22 | Hatsopoulos George N | Buy | 50,890 | .00 | 0 |
| 2015-06-01 | Garrison David A (CFO, Treasurer and Secretary) | Buy | 1,000 | 4.32 | 4,319 |
| 2015-05-29 | Garrison David A (CFO, Treasurer and Secretary) | Buy | 100 | 4.30 | 430 |
| 2015-05-28 | Garrison David A (CFO, Treasurer and Secretary) | Buy | 400 | 4.30 | 1,720 |
Insider trading activities including stock purchases, stock sales, and option exercises of TGEN listed in the above tables cannot be completely guaranteed as to their accuracy. For more insider trading information of Tecogen Inc. (symbol TGEN, CIK number 1537435) see the Securities and Exchange Commission (SEC) website.