X0306 4 2016-03-18 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 Common Stock 2016-03-18 4 X 0 96774 0.93 A 390631 D Warrant (right to buy) 0.93 2016-03-18 4 X 0 96774 0 D 2016-05-31 Common Stock 96774 0 D This Warrant was previously reported as relating to 30,000 shares with an exercise price of $3.00 per share. As a result of the Warrant's adjustment provisions, the Warrant was adjusted to relate to 96,774 shares and an exercise price of $0.93 per share. This Warrant has been exercised in exchange for a cash payment by the reporting owner. This Warrant was acquired in 2011 in connection with the purchase of Issuer Common Stock, and it is being exercised prior to its expiration date of May 31, 2016. The Reporting Person intends to hold the shares of common stock. Warrant became exercisable upon issuance. As previously reported on February 12, 2015, the Reporting Person held a total of 96,774 exercisable Warrant shares. The total beneficially owned derivative securities reported at the time inadvertently included securities of a separate class, and, accordingly, such previously reported shares are now properly excluded. /s/ Gerard L. Conway Jr., Attorney-in-fact 2016-03-22