X0306 4 2021-09-28 0 0001093691 PLUG POWER INC PLUG 0001431827 Marsh Andrew C/O PLUG POWER INC. 968 ALBANY SHAKER ROAD LATHAM NY 12110 1 1 0 0 President & CEO Common Stock 2021-09-28 4 F 0 88312 28.40 D 859048 D Tendered to Issuer to satisfy tax withholding obligations of the Reporting Person incurred in connection with the vesting of the Reporting Person's restricted stock award. The initial grant of the restricted stock award was reported on a Form 4 filed on September 30, 2020, but was inadvertently described in the accompanying footnote as a restricted stock unit award instead of a restricted stock award. /s/ Gerard L. Conway, Jr., Attorney-in-Fact 2022-05-02