Annual report pursuant to Section 13 and 15(d)

Stockholders' equity (Tables)

v3.24.1
Stockholders' equity (Tables) - Tecogen
 12 Months Ended
Dec. 31, 2023
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, 2023 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, 2022 3,204,297  $ 0.71  — $ 10.33  $ 1.61  7.30 years $ 882,074 
Granted 575,000  $ 0.88  — $ 1.10  $ 0.93 
Exercised —  —
Canceled and forfeited (141,175) $ 0.71  — $ 4.50 $ 1.81 
Outstanding, December 31, 2023 3,638,122  $ 0.71  — $ 10.33  $ 1.49  6.70 years $ 127,811 
Exercisable, December 31, 2023 1,953,197  $ 1.95  $ 77,961 
Vested and expected to vest, December 31, 2023 3,385,353  $ 1.53  $ 120,333 
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 2023 and 2022 are as follows:
Stock option award assumptions: 2023 2022
Expected dividend yield —% —%
Expected life 6.25 years 6.25 years
Risk-free interest rate 4.70% 2.17%
Expected volatility 38.49% 36.24%