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Stock Trading History of Castleberry John K

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 Castleberry John K since year 2005. The trader's CIK number is 1195517. At the time of this reporting, Castleberry John K is the CEO of WBI Hold., In of Mdu Resources Group Inc (stock ticker symbol MDU).

Stock purchases, sales, and option exercises reported by *Castleberry John K* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2005-05-18	MDU	Mdu Resources Group Inc	Sale	6,800	28.00	190,400
2005-05-17	MDU	Mdu Resources Group Inc	Sale	14,174	27.75	393,328
2005-05-16	MDU	Mdu Resources Group Inc	Sale	20,974	27.50	576,785
2005-05-12	MDU	Mdu Resources Group Inc	Sale	5,346	28.15	150,489

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 Castleberry John K (CEO of WBI Hold., In of Mdu Resources Group Inc at the time of this reporting) see the Securities and Exchange Commission (SEC) website.