v3.26.1
Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2026
Employee Benefit Plans  
Schedule of components and classification of stock-based compensation expense

The components and classification of stock-based compensation expense, excluding the Company’s matching contributions to the Plug Power Inc. 401(k) Savings & Retirement Plan and quarterly Board compensation, were as follows (in thousands):

Three months ended June 30,

Six months ended June 30,

2026

  ​ ​ ​

2025

  ​ ​ ​

2026

  ​ ​ ​

2025

Cost of sales

$

1,234

$

1,395

$

2,453

$

2,482

Research and development

965

875

1,921

2,012

Selling, general and administrative

8,487

7,787

17,472

14,036

$

10,686

$

10,057

$

21,846

$

18,530

Service Stock Options Awards  
Employee Benefit Plans  
Schedule of assumptions used in valuation of options The assumptions made for purposes of estimating fair value under the Black-Scholes model for the 12,841,573 service stock options granted during the six months ended June 30, 2026 were as follows:

Expected term of options (years)

5.00

Risk free interest rate

3.48% - 4.15%

Volatility

90.07% - 101.87%