Quarterly report [Sections 13 or 15(d)]

Stock-Based Compensation (Tables)

v3.25.1
Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2025
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, 2025 and 2024 are as follows:
Stock Option Award Assumptions March 31, 2025 March 31, 2024
Expected dividend yield —% —%
Expected life 6.25 years 6.25 years
Risk-free interest rate 4.22% 4.28%
Expected volatility 42.33% 40.17%
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, 2025 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, 2024 2,752,962  $0.71 — $3.93 $ 1.14  6.70 years $ 1,348,684 
Granted
 30,000  $2.14 — $2.88 $ 2.32 
Exercised
 (35,000) $1.10 $ 1.10  $ 49,175 
Outstanding, March 31 2025 2,747,962  $0.71 — $3.93 $ 1.16  6.48 years $ 3,234,426 
Exercisable, March 31, 2025 1,805,462  $ 1.26  $ 2,036,326 
Vested and expected to vest, March 31, 2025 2,606,587  $ 1.17    $ 3,054,711