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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1037676	Arch Coal Inc	ACI	Bituminous Coal & Lignite Surface Mining (1221)	430921172

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1046080	W John Eaves	One Cityplace Drive St. Louis MO 63141	President & Coo	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2010-12-01	18,200	$10.98	112,507	No	4	M	Direct
Common Stock	Disposition	2010-12-01	18,200	$30.31	94,307	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Options (right to buy)	Disposition	2010-12-01	18,200	$0.00	18,200	$10.98

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2011-02-22	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	4,596	Indirect	By 401(k) Plan

Footnotes

This represents the weighted average price at which the shares were sold. The shares were sold at prices ranging from $29.85 to $30.58. Mr. Eaves will provide, upon request of the SEC staff, Arch Coal, Inc., or a shareholder of Arch Coal, Inc., complete information regarding the number of shares pruchased at each price within the range.
The reporting person received 18,200 stock options on February 22, 2001. The stock options vested as follows: 6,067 stock options vested on February 22, 2002; 6,067 stock options vested on February 22, 2003; and 6,066 stock options vested on February 22, 2004.