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$TGEN

$6.81 -$0.05 (0.73%)

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Insider Transactions

Insider Transaction Summary

GEORGE N HATSOPOULOS

1,355,541 shares

Net: 0 B/S: -

John Hatsopoulos

1,038,951 shares

Net: +50,000 B/S: ∞

Earl Lewis

1,011,006 shares

Net: +10,000 B/S: ∞

JOHN HATSOPOULOS

988,951 shares

Net: 0 B/S: -

Locke M. Benjamin

736,800 shares

Net: 0 B/S: -

Susan B Hirsch

265,416 shares

Net: +40,000 B/S: ∞

AHMED GHONIEM

237,723 shares

Net: +25,000 B/S: ∞

ANGELINA GALITEVA

225,000 shares

Net: +25,000 B/S: ∞

CHARLEST MAXWELL

224,590 shares

Net: 0 B/S: -

JOHN M ALBERTINE

175,000 shares

Net: +25,000 B/S: ∞

FRED HOLUBOW

175,000 shares

Net: 0 B/S: -

Ralph Jenkins

150,000 shares

Net: 0 B/S: -

Deanna M Petersen

109,200 shares

Net: 0 B/S: -

EARL R LEWIS

91,250 shares

Net: +25,000 B/S: ∞

BONNIE JEAN BROWN

69,200 shares

Net: 0 B/S: -

Abinand Rangesh

67,193 shares

Net: +56,892 B/S: ∞

ROBERT A PANORA

62,523 shares

Net: -20,254 B/S: 0.56

Roger P. Deschenes

52,962 shares

Net: +27,964 B/S: ∞

John Kimball IV Whiting

22,612 shares

Net: +21,976 B/S: ∞

Stephen Lafaille

12,376 shares

Net: +11,976 B/S: 1.34

DAVID A GARRISON

6,362 shares

Net: 0 B/S: -

Ahmed Ghoniem

0 shares

Net: 0 B/S: ∞

Insider Name	Current Shares	Net Change (1yr)	Buy/Sell Ratio
GEORGE N HATSOPOULOS	1,355,541	0	-
John Hatsopoulos	1,038,951	+50,000	∞
Earl Lewis	1,011,006	+10,000	∞
JOHN HATSOPOULOS	988,951	0	-
Locke M. Benjamin	736,800	0	-
Susan B Hirsch	265,416	+40,000	∞
AHMED GHONIEM	237,723	+25,000	∞
ANGELINA GALITEVA	225,000	+25,000	∞
CHARLEST MAXWELL	224,590	0	-
JOHN M ALBERTINE	175,000	+25,000	∞
FRED HOLUBOW	175,000	0	-
Ralph Jenkins	150,000	0	-
Deanna M Petersen	109,200	0	-
EARL R LEWIS	91,250	+25,000	∞
BONNIE JEAN BROWN	69,200	0	-
Abinand Rangesh	67,193	+56,892	∞
ROBERT A PANORA	62,523	-20,254	0.56
Roger P. Deschenes	52,962	+27,964	∞
John Kimball IV Whiting	22,612	+21,976	∞
Stephen Lafaille	12,376	+11,976	1.34
DAVID A GARRISON	6,362	0	-
Ahmed Ghoniem	0	0	∞

Individual Transactions

April 24, 2026

Ahmed Ghoniem

Open Market Purchase

Change: +12,723

Price: $0.79

Shares: 12,723

Value: +$10,000

Ahmed Ghoniem

Option Exercise/Conversion

Change: -12,723

Price: $0.79

Shares: 0

Value: -$10,000

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Ahmed Ghoniem	Apr 27	Open Market Purchase (P) Market Purchase	12,723	+12,723	$0.79	+$10,000
Ahmed Ghoniem	Apr 27	Option Exercise/Conversion (M) Compensation/Award	0	-12,723	$0.79	-$10,000

April 13, 2026

Susan B Hirsch

Open Market Purchase

Change: +5,000

Price: $3.73

Shares: 265,416

Value: +$18,650

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Susan B Hirsch	Apr 14	Open Market Purchase (P) Market Purchase	265,416	+5,000	$3.73	+$18,650

March 27, 2026

Susan B Hirsch

Open Market Purchase

Change: +10,000

Price: $2.54

Shares: 260,416

Value: +$25,400

Earl Lewis

Open Market Purchase

Change: +5,000

Price: $2.52

Shares: 1,011,006

Value: +$12,596

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Susan B Hirsch	Mar 27	Open Market Purchase (P) Market Purchase	260,416	+10,000	$2.54	+$25,400
Earl Lewis	Mar 27	Open Market Purchase (P) Market Purchase	1,011,006	+5,000	$2.52	+$12,596

March 26, 2026

Earl Lewis

Open Market Purchase

Change: +5,000

Price: $2.88

Shares: 1,006,006

Value: +$14,408

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Earl Lewis	Mar 27	Open Market Purchase (P) Market Purchase	1,006,006	+5,000	$2.88	+$14,408

March 23, 2026

John Kimball IV Whiting

Open Market Purchase

Change: +10,000

Price: $2.38

Shares: 22,612

Value: +$23,800

Insider	Filing Date	Transaction	Shares	Change	Price	Value
John Kimball IV Whiting	Mar 23	Open Market Purchase (P) Market Purchase	22,612	+10,000	$2.38	+$23,800

March 20, 2026

Abinand Rangesh

Open Market Purchase

Change: +3,000

Price: $2.30

Shares: 67,193

Value: +$6,894

Roger P. Deschenes

Open Market Purchase

Change: +10,000

Price: $2.23

Shares: 52,962

Value: +$22,300

John Hatsopoulos

Option Exercise/Conversion

Change: +50,000

Price: $0.88

Shares: 1,038,951

Value: +$44,000

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Abinand Rangesh	Mar 23	Open Market Purchase (P) Market Purchase	67,193	+3,000	$2.30	+$6,894
Roger P. Deschenes	Mar 23	Open Market Purchase (P) Market Purchase	52,962	+10,000	$2.23	+$22,300
John Hatsopoulos	Mar 23	Option Exercise/Conversion (M) Compensation/Award	1,038,951	+50,000	$0.88	+$44,000

July 24, 2025

Stephen Lafaille

Grant/Award Acquisition

Change: +11,976

Price: $0.00

Shares: 12,376

Value: +$0

John Kimball IV Whiting

Grant/Award Acquisition

Change: +11,976

Price: $0.00

Shares: 12,612

Value: +$0

Abinand Rangesh

Grant/Award Acquisition

Change: +53,892

Price: $0.00

Shares: 64,193

Value: +$0

Susan B Hirsch

Grant/Award Acquisition

Change: +25,000

Price: $8.35

Shares: 150,000

Value: +$208,750

AHMED GHONIEM

Grant/Award Acquisition

Change: +25,000

Price: $8.35

Shares: 237,723

Value: +$208,750

ANGELINA GALITEVA

Grant/Award Acquisition

Change: +25,000

Price: $8.35

Shares: 225,000

Value: +$208,750

Roger P. Deschenes

Grant/Award Acquisition

Change: +17,964

Price: $0.00

Shares: 42,962

Value: +$0

EARL R LEWIS

Grant/Award Acquisition

Change: +25,000

Price: $8.35

Shares: 91,250

Value: +$208,750

JOHN M ALBERTINE

Grant/Award Acquisition

Change: +25,000

Price: $8.35

Shares: 175,000

Value: +$208,750

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Stephen Lafaille	Jul 28	Grant/Award Acquisition (A) Compensation/Award	12,376	+11,976	$0.00	+$0
John Kimball IV Whiting	Jul 28	Grant/Award Acquisition (A) Compensation/Award	12,612	+11,976	$0.00	+$0
Abinand Rangesh	Jul 28	Grant/Award Acquisition (A) Compensation/Award	64,193	+53,892	$0.00	+$0
Susan B Hirsch	Jul 28	Grant/Award Acquisition (A) Compensation/Award	150,000	+25,000	$8.35	+$208,750
AHMED GHONIEM	Jul 28	Grant/Award Acquisition (A) Compensation/Award	237,723	+25,000	$8.35	+$208,750
ANGELINA GALITEVA	Jul 28	Grant/Award Acquisition (A) Compensation/Award	225,000	+25,000	$8.35	+$208,750
Roger P. Deschenes	Jul 28	Grant/Award Acquisition (A) Compensation/Award	42,962	+17,964	$0.00	+$0
EARL R LEWIS	Jul 28	Grant/Award Acquisition (A) Compensation/Award	91,250	+25,000	$8.35	+$208,750
JOHN M ALBERTINE	Jul 28	Grant/Award Acquisition (A) Compensation/Award	175,000	+25,000	$8.35	+$208,750

June 24, 2025

ROBERT A PANORA

Open Market Sale

Change: -900

Price: $6.86

Shares: 62,523

Value: -$6,174

Insider	Filing Date	Transaction	Shares	Change	Price	Value
ROBERT A PANORA	Jul 14	Open Market Sale (S) Market Sale	62,523	-900	$6.86	-$6,174