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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
1335177	N David Warnecke	Cityplace One Suite 300 St. Louis MO 63144	Vp-Marketing & Trading	No	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	Disposition	2010-12-07	13,093	$32.69	0	No	4	S	Indirect	By 401(k) plan

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	By 401(k) plan

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Phantom Stock	Disposition	2010-12-07	3,002	$32.35	3,002	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0			No	4	I	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	5,000	Direct

Footnotes

Each share of phantom stock represents a right to receive the value in cash of one share of Arch Coal, Inc. common stock. The shares of phantom stock are held by the executive officer through the Arch Coal, Inc. Deferred Compensation Plan (the "Plan"). The shares of phantom stock acquired by the executive officer represent dividends attributable to amounts that the executive officer elected to defer under the Plan into a hypothetical investment in shares of Arch Coal, Inc. common stock.
Shares of phantom stock are payable in cash on the date or dates elected by the executive officer, subject to the terms of the Plan. The executive officer may transfer any and all of the phantom stock account into an alternative investment account at any time.