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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	2011-02-21	10,850	$33.04	105,157	No	4	A	Direct
Common Stock	Disposition	2011-02-21	10,850	$32.15	94,307	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Units	Disposition	2011-02-21	10,850	$0.00	10,850	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
10,850			No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	9,341	Indirect	By 401(k) plan

Footnotes

The transaction date previously filed on this reporting person's Form 4 was incorrect. This amendment reflects the correct transaction date.
The reporting person received 21,700 restricted stock units on February 21, 2008. The restricted stock units vest as follows: 10,850 units vest on February 21, 2011 and 10,850 units vest on February 21, 2012. Upon vesting of 10,850 restricted stock units on February 21, 2011, the reporting person received 10,850 shares of common stock.
Each restricted stock unit represents a right to receive one share of common stock unless otherwise deferred, at the reporting person's election, pursuant to the Arch Coal, Inc. Executive Deferred Compensation Plan.
The reporting person received 21,700 restricted stock units on February 21, 2008. The restricted stock units vest ratably over a two-year period. On February 21, 2011, 10,850 restricted stock units vested.
The restricted stock units do not expire.