Lafaille Stephen

• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Earnings

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Abbreviations B: Buy, S: Sell, PP: Planned purchase, PS: Planned sale, O: Option / Other

Notification date	Transaction date	B/S Transaction type	Nb. shares Price Value	Number of shares	Price	Value	Details
2025-06-24	2025-06-23	Tecogen Inc (TGEN)	S Sale	10,000 -96.2% 7.25 USD 72,500	10,000 -96.2%	7.25	USD 72,500
2025-06-24	2025-06-06	Tecogen Inc (TGEN)	S Sale	25,000 -98.4% 5.98 USD 149,500	25,000 -98.4%	5.98	USD 149,500
2025-06-24	2025-06-04	Tecogen Inc (TGEN)	S Sale	15,000 -97.4% 5.00 USD 75,000	15,000 -97.4%	5.00	USD 75,000
2025-06-24	2025-06-03	Tecogen Inc (TGEN)	S Sale	10,000 -96.2% 4.88 USD 48,800	10,000 -96.2%	4.88	USD 48,800
2025-06-24	2025-03-03	Tecogen Inc (TGEN)	B Purchase	400 +inf% 2.50 USD 1,000	400 +inf%	2.50	USD 1,000