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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
1464304	Iii C George Morris	One Cityplace Drive Suite 300 St. Louis MO 63141		Yes	No	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	2012-03-07	8,400	$11.89	19,053	No	4	P	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Units	Acquisiton	2012-03-07	2,500	$0.00	2,500	$11.85
Common Stock	Phantom Stock	Acquisiton	2012-03-07	5,063	$11.85	5,063	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
2,500			No	4	A	Direct
5,063			No	4	A	Direct

Footnotes

The reporting person received 2,500 restricted stock units on March 7, 2012. The restricted stock units vest upon the retirement of the reporting person.
The restricted stock units do not expire.
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 director through the Arch Coal, Inc. Deferred Compensation Plan for Non-Employee Directors (the "Plan") and represent past compensation that the director elected to defer under the Plan into a hypothetical investment in shares of Arch Coal, Inc. common stock and/or dividends attributable to such deferred amounts.
Shares of phantom stock are payable in cash following termination of the director's service as a director of Arch Coal, Inc. The director may transfer certain portions of the phantom stock account into an alternative investment account at any time.