UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

 (Amendment No. 1)

(Name of Issuer)

 (Title of Classes of Securities)

 (CUSIP Numbers)

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

*The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No.: 039380407

Item 1(a). Name of Issuer:

Arch Coal Inc

(b). Address of Issuer’s Principal Executive Offices:

1 City Place Drive, Suite 300, Saint Louis, MO 63141

1 Item 2(a). Name of Person Filing:

Invesco Senior Secured Management Inc.

(b). Address of Principal Business Office or, if none, residence of filing person:

1166 Ave of the Americas 26th floor New York NY 10036

(c). Citizenship of filing person:

State of Delaware, United States

(d). Title of Classes of Securities:

Common Stock

(e). CUSIP Numbers:

039380407

Item 3. If this Statement is Filed Pursuant to ss240.13d-1(b) or 240.13d-2(b) or (c), Check Whether the Person Filing is a:

(e) [x] An investment adviser in accordance with section 240.13d-1(b)(1)(ii)(E)

(g) [x] A parent holding company or control person in accordance with section 240.13d-1(b)(1)(ii)(G)

Item 4. Ownership:

Please see responses to Items 5-8 on the cover of this statement, which are incorporated herein by reference.

Item 5. Ownership of Five Percent or Less of a Class:

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [ ]

Item 6. Ownership of More than Five Percent on Behalf of another Person:

Invesco Senior Secured Management Inc. as a discretionary manager for OFI-Senior Floating Rate beneficially owns 19.73% of security reported herein. However, no one individual has greater than 5% economic ownership. The shareholders of the Fund have the right to receive or the power to direct the receipt of dividends and proceeds from the sale of securities listed above.

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Item 7. Identification and Classification of the Subsidiary which Acquired the Security Being Reported on by the Parent Holding Company:

Not Applicable.

Item 8. Identification and Classification of Members of the Group:

Not Applicable. This schedule is not being filed pursuant to Rule 13d-1(b)(1)(ii)(J) or Rule 13d-1(d).

Item 9. Notice of Dissolution of a Group:

Not Applicable.

Item 10. Certification:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

Signature:

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date

Invesco Senior Secured Management Inc.

By:    /s/Tara McAleer

Tara McAleer

Chief Compliance Officer