Item 7.01 Regulation FD Disclosure.
On July 27, 2009, Arch Coal, Inc. (the "Company") issued a press release announcing the commencement of an offering of 17,000,000 shares of its common stock pursuant to an automatic shelf registration statement on Form S-3 filed previously with the Securities and Exchange Commission. A copy of the press release is attached hereto as Exhibit 99.1.
On July 27, 2009, the Company issued a press release announcing the commencement of an offering in accordance with Rule 144A under the Securities Act of 1933, as amended, of $500 million in aggregate principal amount of senior unsecured notes due 2016. A copy of the press release is attached hereto as Exhibit 99.2.
The information contained in Item 7.01 and the exhibits attached hereto shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, nor shall they be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing. Item 9.01 Financial Statements and Exhibits.
(d) Exhibits The following exhibits are attached hereto and filed herewith.

Exhibit
No. Description

99.1 Press release dated July 27, 2009 announcing offering of common stock.

99.2 Press release dated July 27, 2009 announcing offering of senior notes.

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Signatures Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: July 27, 2009 Arch Coal, Inc.

By: /s/ Robert G. Jones Robert G. Jones Senior Vice President - Law, General Counsel and Secretary

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