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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
1431827	Andrew Marsh	968 Albany Shaker Road Latham NY 12110		Yes	No	No	Yes

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Plug Power Common Stock	Acquisiton	2011-05-31	20,000	$2.42	38,465	No	4	P	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Plug Power Common Stock	Warrants	Acquisiton	2011-05-31	15,000	$2.42	15,000	$3.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
161,850	2011-05-31	2016-05-31	No	4	P	Direct

Footnotes

The shares and warrants were acquired on May 31, 2011 as part of a public offering of shares of common stock and warrants to purchase shares of common stock. Pursuant to the terms of the public offering, each share of common stock was sold together with 0.75 of a 5-year warrant to purchase one share of common stock for an aggregate purchase price of $2.42 per combination.
On May 19, 2011, Plug Power Inc. effected a 1-for-10 reverse stock split of its common stock, resulting in the reporting person's ownership of 166,186 fewer shares of common stock.
Existing stock options held by the reporting person have been adjusted to reflect the 1-for-10 reverse stock split as follows: 40,000 granted 4/8/2008 exercise price $35.80; 250 granted on 5/20/2009 exercise price $9.50; 106,600 granted on 4/13/2011 exercise price of $6.10.