Quarterly report [Sections 13 or 15(d)]

Stock-Based Compensation (Tables)

v3.26.1
Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2026
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions
The weighted average assumptions used in the Black-Scholes option pricing model for options granted in three months ended March 31, 2026 and 2025 are as follows:
Stock Option Award Assumptions March 31, 2026 March 31, 2025
Expected dividend yield —% —%
Expected life 6.50 years 6.25 years
Risk-free interest rate 5.20% 4.22%
Expected volatility 49.49% 42.33%
Tecogen  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Stock Option Activity
Stock option activity for the three months ended March 31, 2026 was as follows: 

Common Stock Options Number of
Options		 Exercise
Price
Per
Share		 Weighted Average Exercise Price Weighted
Average
Remaining
Life		 Aggregate
Intrinsic
Value
Outstanding, December 31, 2025 2,347,044  $ 0.71  — $8.61 $ 1.90  6.29 years $ 7,961,973 
Granted
 50,000  $ 2.36  $ 2.36 
Exercised
 (58,750) $ 0.88  — $1.20 $ 0.93  $ 95,900 
Canceled and forfeited
 (65,500) $ 0.71  — $3.93 $ 0.95 
Outstanding, March 31 2026 2,272,794  $ 0.71  — $8.61 $ 1.97  6.10 years $ 2,933,445 
Exercisable, March 31, 2026 1,400,458  $ 1.26  $ 1,980,445 
Vested and expected to vest, March 31, 2026 2,141,944  $ 1.90    $ 2,790,495