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Stock Trading History of Mattern James M

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 Mattern James M since year 2005. The trader's CIK number is 1194865. At the time of this reporting, Mattern James M is the VP - Administration of Black Hills Corp /sd/ (stock ticker symbol BKH).

Stock purchases, sales, and option exercises reported by *Mattern James M* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2008-01-02	BKH	Black Hills Corp /sd/	Option Exercise	7,500	22.00	165,000
2007-03-21	BKH	Black Hills Corp /sd/	Option Exercise	7,500	19.38	145,350

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 Mattern James M (VP - Administration of Black Hills Corp /sd/ at the time of this reporting) see the Securities and Exchange Commission (SEC) website.