X0306 4 2020-07-13 0 0001093691 PLUG POWER INC PLUG 0001008001 MCNAMEE GEORGE C C/O PLUG POWER INC. 968 ALBANY SHAKER ROAD LATHAM NY 12110 1 0 0 0 Plug Power Common Stock 2020-07-13 4 M 0 1500 5.10 A 889719 D Plug Power Common Stock 2020-07-13 4 S 0 1400 8.7944 D 888319 D Plug Power Common Stock 2020-07-13 4 S 0 100 9.47 D 888219 D Stock Option (Right to Buy) 5.10 2020-07-13 4 M 0 1500 0 D 2021-05-12 Common Stock 1500 0 D Shares sold pursuant to a pre-established 10b5-1 trading plan effective as of June 11, 2020. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.31 to $9.06, 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. This option was previously reported as covering 15,000 shares at an exercise price of $0.51 per share, but was adjusted to reflect a 1-for-10 reverse stock split that occurred on May 19, 2011. 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 2020-07-14