Annual report [Section 13 and 15(d), not S-K Item 405]

Stockholders' equity (Tables)

v3.25.1
Stockholders' equity (Tables) - Tecogen
12 Months Ended
Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Stock Option Activity
Stock option activity for the year ended December 31, 2024 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, 2023 3,638,122  $ 0.71  $ 10.33  $ 1.49  6.70 years $ 127,811 
Granted 125,000  $0.77 $ 0.77 
Exercised (100,000) $0.71 $ 0.71  $ 75,500 
Canceled and forfeited (910,160) $ 0.71  $ 10.33  $ 2.54 
Outstanding, December 31, 2024 2,752,962  $ 0.71  $ 3.93  $ 1.14  6.70 years $ 1,348,684 
Exercisable, December 31, 2024 1,839,212  $ 1.25  $ 838,184 
Vested and expected to vest, December 31, 2024 2,615,900  $ 1.15  $ 1,272,109 
Summary of Weighted Average Assumptions Used in Black-Scholes Option Pricing
The weighted average assumptions used in the Black-Scholes option pricing model for options granted in 2024 and 2023 are as follows:
Stock option award assumptions: 2024 2023
Expected dividend yield —% —%
Expected life 6.25 years 6.25 years
Risk-free interest rate 4.28% 4.70%
Expected volatility 40.17% 38.49%