X0306 4 2020-11-09 0 0001093691 PLUG POWER INC PLUG 0001745274 Silver Jonathan M C/O PLUG POWER INC. 968 ALBANY SHAKER ROAD LATHAM NY 12110 1 0 0 0 Common Stock 2020-11-09 4 M 0 15520 1.94 A 59856 D Common Stock 2020-11-09 4 M 0 27056 2.31 A 86912 D Common Stock 2020-11-09 4 S 0 42576 20.0019 D 44336 D Stock Option (Right to Buy) 1.94 2020-11-09 4 M 0 15520 0 D 2028-06-25 Common Stock 15520 0 D Stock Option (Right to Buy) 2.31 2020-11-09 4 M 0 27056 0 D 2029-05-09 Common Stock 27056 0 D Shares sold pursuant to a pre-established 10b5-1 trading plan effective as of September 14, 2020. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.00 to $20.01, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range. The stock option granted to the Reporting Person is fully vested and exercisable as of the date hereof. /s/ Gerard L. Conway Jr., Attorney-in-Fact 2020-11-12