X0306 4 2016-07-23 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 and CEO Common Stock 2016-07-23 4 M 0 122222 A 525606 D Common Stock 2016-07-23 4 F 0 72747 1.79 D 452859 D Common Stock 61843 I By 401(k) Plan Restricted Stock Units 2016-07-23 4 M 0 122222 0 D Common Stock 122222 0 D Restricted stock units convert into common stock on a one-for-one basis. The reporting person holds 61,843 shares of Plug Power Common Stock under a 401(k) plan. The information in this report is based on a plan statement as of December 31, 2015. Awarded pursuant to Plug Power's 2011 Stock Option and Incentive Plan. The restricted stock units are fully vested as of July 23, 2016. /s/ Gerard L. Conway, Jr., Attorney-in-Fact 2016-07-26