Stock Trading History of Lang Paul 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 Lang Paul A since year 2005. The trader's CIK number is 1382977. At the time of this reporting, Lang Paul A is the Senior VP - Operations of Arch Coal Inc . (stock ticker symbol ACI). See this page for all insider trading activities at Arch Coal Inc .

Stock purchases, sales, and option exercises reported by insider *Lang Paul A* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2008-06-03	ACI	Arch Coal Inc	Option Exercise	10,000	51.50	514,950
2008-02-25	ACI	Arch Coal Inc	Option Exercise	834	.00	0
2008-02-08	ACI	Arch Coal Inc	Sale	11,734	50.00	586,700
2008-02-08	ACI	Arch Coal Inc	Option Exercise	6,000	11.30	67,800
2008-02-07	ACI	Arch Coal Inc	Option Exercise	4,900	.00	0
2007-05-04	ACI	Arch Coal Inc	Option Exercise	4,900	.00	0

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 Lang Paul A (Senior VP - Operations of Arch Coal Inc at the time of this reporting) see the Securities and Exchange Commission (SEC) website.