PLUG POWER INC — Director's Dealing 2013

Feb 19, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: PLUG POWER INC (PLUG)
CIK: 0001093691
Period of Report: 2013-02-14

Reporting Person: MARXE AUSTIN W & GREENHOUSE DAVID M (10% Owner)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-02-14	Common Stock	S	2000000	$0.1234	Disposed	6511620	Indirect
2013-02-14	Common Stock	S	5000000	$0.134	Disposed	1511620	Indirect

Footnotes

F1: This is a joint filing by Austin W. Marxe (Marxe) and David M. Greenhouse (Greenhouse). They share voting and investment control over all securities owned by Special Situations Fund III QP, L.P. (SSFQP), Special Situations Cayman Fund, L.P. (Cayman), Special Situations Private Equity Fund, L.P. (PE), Special Situations Technology Fund, L.P. (Tech) and Special Situations Technology Fund II, L.P. (Tech2). 561,004 shares of Common Stock are held by SSFQP, 168,715 shares of Common Stock are held by Cayman, 103,251 shares of Common Stock are held by PE, 94,293 shares of Common Stock are held by Tech and 584,357 shares of Common Stock are held by Tech2. The interest of Marxe and Greenhouse in the shares of Common Stock owned by SSFQP, Cayman, PE, Tech and Tech2 is limited to the extent of his pecuniary interest.

F2: This is a weighed average price.