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Stock Trading History of Sperry Mark A

The following table details the trading activities (stock purchases, stock sales, and stock option exercises) reported to the Securities and Exchange Commission (SEC) by insider Sperry Mark A since year 2005. The trader's CIK number is 1279246. At the time of this reporting, Sperry Mark A is the VP and Chief Marketing Officer of Plug Power Inc (stock ticker symbol PLUG).

Stock purchases, sales, and option exercises reported by insider *Sperry Mark A* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2008-02-04	PLUG	Plug Power Inc	Sale	3,150	2.92	9,182
2007-02-01	PLUG	Plug Power Inc	Sale	3,200	3.65	11,680

Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Sperry Mark A (VP and Chief Marketing Officer of Plug Power Inc at the time of this reporting) see the Securities and Exchange Commission (SEC) website.