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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1093691	Plug Power Inc	PLUG	Electrical Industrial Apparatus (3620)	223672377

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1044321	M David Greenhouse & W Austin Marxe	C/O Special Situations Funds 527 Madison Avenue, Suite 2600 New York NY 10022		No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Disposition	2013-02-14	2,000,000	$0.12	6,511,620	No	4	S	Indirect	By Limited Partnerships
Common Stock	Disposition	2013-02-14	5,000,000	$0.13	1,511,620	No	4	S	Indirect	By Limited Partnerships

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	By Limited Partnerships
No	4	S	Indirect	By Limited Partnerships

Footnotes

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.
This is a weighed average price.