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Stock Trading History of Preston John T

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 Preston John T since year 2005. The trader's CIK number is 938731. At the time of this reporting, Preston John T is the Director of Clean Harbors Inc . (stock ticker symbol CLHB). See this page for all insider trading activities at Clean Harbors Inc .

Stock purchases, sales, and option exercises reported by insider *Preston John T* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2008-03-18	CLHB	Clean Harbors Inc	Sale	6,000	63.07	378,420
2008-03-18	CLHB	Clean Harbors Inc	Option Exercise	6,000	10.37	62,219

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 Preston John T (Director of Clean Harbors Inc at the time of this reporting) see the Securities and Exchange Commission (SEC) website.