Annual report pursuant to Section 13 and 15(d)

Stockholders' equity (Tables)

v3.23.1
Stockholders' equity (Tables) - Tecogen
12 Months Ended
Dec. 31, 2022
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, 2022 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, 2021 2,386,842  $ 0.71  $ 10.33  $ 1.81  7.56 years $ 697,935 
Granted 1,036,650  $ 1.00  $ 1.41  $ 1.14 
Exercised — 
Canceled and forfeited (219,195) $ 1.00  $ 6.74 $ 1.58 
Outstanding, December 31, 2022 3,204,297  $ 0.71  $ 10.33  $ 1.61  7.30 years $ 882,074 
Exercisable, December 31, 2022 1,421,147  $ 2.32  $ 391,257 
Vested and expected to vest, December 31, 2022 2,936,825  $ 1.66  $ 808,252 
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 2022 and 2021 are as follows:
Stock option awards: 2022 2021
Expected life 6.25 years 6.25 years
Risk-free interest rate 2.17% 1.09%
Expected volatility 36.24% 35.86%