| SECURITIES AND EXCHANGE COMMISSION | |
| Washington, D.C. 20549 | |
| SCHEDULE 13G | |
| Under the Securities Exchange Act of 1934 | |
| (Amendment No. )* | |
Arch Coal, Inc. | |
| (Name of Issuer) | |
Common Stock, par value $0.01 per share | |
| (Title of Class of Securities) | |
039380407 | |
| (CUSIP Number) | |
June 11, 2019** | |
| (Date of event which requires filing of this statement) | |
| Check the appropriate box to designate the rule pursuant to which this Schedule 13G is filed: | |
| ¨ | Rule 13d-1(b) |
| x | Rule 13d-1(c) |
| ¨ | Rule 13d-1(d) |
| (Page 1 of 8 Pages) | |
______________________________
*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 obligation to file this Schedule 13G arose as a result of an adjustment to the number of shares of Common Stock issuable upon exercise of the warrants reported herein. Such adjustment became effective on May 30, 2019. The Reporting Persons became aware of the adjustment on June 11, 2019.
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 | 13G | Page 2 of 8 Pages |
| 1 | NAMES OF REPORTING PERSONS Highbridge Capital Management, LLC | |||
| 2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP | (a)¨ (b)¨ | ||
| 3 | SEC USE ONLY | |||
| 4 | CITIZENSHIP OR PLACE OF ORGANIZATION State of Delaware | |||
| NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH | 5 | SOLE VOTING POWER 0 | ||
| 6 | SHARED VOTING POWER 915,795 shares of Common Stock issuable upon exercise of warrants | |||
| 7 | SOLE DISPOSITIVE POWER 0 | |||
| 8 | SHARED DISPOSITIVE POWER 915,795 shares of Common Stock issuable upon exercise of warrants | |||
| 9 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 915,795 shares of Common Stock issuable upon exercise of warrants | |||
| 10 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES | ¨ | ||
| 11 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.17% | |||
| 12 | TYPE OF REPORTING PERSON IA, OO | |||
| CUSIP No. 039380407 | 13G | Page 3 of 8 Pages |
| 1 | NAMES OF REPORTING PERSONS Highbridge MSF International Ltd. | |||
| 2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP | (a)¨ (b)¨ | ||
| 3 | SEC USE ONLY | |||
| 4 | CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands, British West Indies | |||
| NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH | 5 | SOLE VOTING POWER 0 | ||
| 6 | SHARED VOTING POWER 915,795 shares of Common Stock issuable upon exercise of warrants | |||
| 7 | SOLE DISPOSITIVE POWER 0 | |||
| 8 | SHARED DISPOSITIVE POWER 915,795 shares of Common Stock issuable upon exercise of warrants | |||
| 9 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 915,795 shares of Common Stock issuable upon exercise of warrants | |||
| 10 | CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES | ¨ | ||
| 11 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 5.17% | |||
| 12 | TYPE OF REPORTING PERSON OO | |||
| CUSIP No. 039380407 | 13G | Page 4 of 8 Pages |
| Item 1(a). | NAME OF ISSUER: |
| The name of the issuer is Arch Coal, Inc. (the "Company"). |
| Item 1(b). | ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: |
| The Company's principal executive offices are located at One CityPlace Drive, Suite 300, St. Louis, Missouri 63141. |
| Item 2(a). | NAME OF PERSON FILING: |
| Item 2(b). | ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE: |
| Item 2(c). | CITIZENSHIP: |
| This statement is filed by: | ||
| (i) | Highbridge Capital Management, LLC 40 West 57th Street, 32nd Floor New York, New York 10019 Citizenship: State of Delaware | |
| (ii) | Highbridge MSF International Ltd. c/o Highbridge Capital Management, LLC 40 West 57th Street, 32nd Floor New York, New York 10019 Citizenship: Cayman Islands | |
| The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons." | ||
| Item 2(d). | TITLE OF CLASS OF SECURITIES: |
| Common Stock, par value $0.01 per share (the "Common Stock"). |
| Item 2(e). | CUSIP NUMBER: |
| 039380407 |
| Item 3. | IF THIS STATEMENT IS FILED PURSUANT TO RULES 13d-1(b) OR 13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A: |
| (a) | ¨ | Broker or dealer registered under Section 15 of the Act, | |
| (b) | ¨ | Bank as defined in Section 3(a)(6) of the Act, | |
| (c) | ¨ | Insurance Company as defined in Section 3(a)(19) of the Act, | |
| (d) | ¨ | Investment Company registered under Section 8 of the Investment Company Act of 1940, | |
| (e) | ¨ | An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E); |
| CUSIP No. 039380407 | 13G | Page 5 of 8 Pages |
| (f) | ¨ | Employee Benefit Plan or Endowment Fund in accordance with Rule 13d-1(b)(1)(ii)(F), | |
| (g) | ¨ | Parent Holding Company or control person in accordance with Rule 13d-1(b)(1)(ii)(G), | |
| (h) | ¨ | Savings Association as defined in Section 3(b) of the Federal Deposit Insurance Act, | |
| (i) | ¨ | A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act; | |
| (j) | ¨ | A non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J); | |
| (k) | ¨ | Group, in accordance with Rule 13d-1(b)(1)(ii)(K). |
If filing as a non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J), please specify the type of institution:___________________________________ |
| Item 4. | OWNERSHIP. |
| (a) Amount beneficially owned: | |
| As of the date hereof, (i) Highbridge MSF International Ltd. may be deemed to beneficially own 915,795 shares of Common Stock issuable upon exercise of warrants and (ii) Highbridge Capital Management, LLC, as the trading manager of Highbridge MSF International Ltd., may be deemed to be the beneficial owner of the 915,795 shares of Common Stock issuable upon exercise of warrants held by Highbridge MSF International Ltd. | |
| (b) Percent of class: | |
| The percentages used herein and in the rest of this Schedule 13G are calculated based upon 16,809,849 shares of Common Stock reported to be outstanding as of April 19, 2019, as reported in the Company's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2019 filed by the Company with the Securities and Exchange Commission on April 23, 2019, and assumes the exercise of the warrants reported herein. Therefore, as of the date hereof, (i) Highbridge MSF International Ltd. may be deemed to beneficially own approximately 5.17% of the outstanding shares of Common Stock and (ii) Highbridge Capital Management, LLC may be deemed to beneficially own approximately 5.17% of the outstanding shares of Common Stock. | |
| The foregoing should not be construed in and of itself as an admission by any Reporting Person as to beneficial ownership of the shares of Common Stock issuable upon exercise of warrants held by Highbridge MSF International Ltd. | |
| (c) Number of shares as to which such person has: | |
| (i) Sole power to vote or to direct the vote | |
| 0 | |
(ii) Shared power to vote or to direct the vote |
| CUSIP No. 039380407 | 13G | Page 6 of 8 Pages |
| See Item 4(a) | |
| (iii) Sole power to dispose or to direct the disposition of | |
| 0 | |
| (iv) Shared power to dispose or to direct the disposition of | |
| See Item 4(a) |
| Item 5. | OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS. |
| Not applicable. |
| Item 6. | OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON. |
| Not applicable. |
| 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. |
| Item 9. | NOTICE OF DISSOLUTION OF GROUP. |
| Not applicable. |
| Item 10. | CERTIFICATION. |
| Each Reporting Person hereby makes the following certification: | |
| By signing below the Reporting Person certifies that, to the best of its knowledge and belief, the securities referred to above 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. |
| CUSIP No. 039380407 | 13G | Page 7 of 8 Pages |
SIGNATURES
After reasonable inquiry and to the best of our knowledge and belief, the undersigned certifies that the information set forth in this statement is true, complete and correct.
DATED: June 14, 2019
| HIGHBRIDGE CAPITAL MANAGEMENT, LLC | ||
| By: | /s/ John Oliva | |
| Name: | John Oliva | |
| Title: | Managing Director | |
| HIGHBRIDGE MSF INTERNATIONAL LTD. | ||
| By: | Highbridge Capital Management, LLC its Trading Manager | |
| By: | /s/ John Oliva | |
| Name: | John Oliva | |
| Title: | Managing Director | |
| CUSIP No. 039380407 | 13G | Page 8 of 8 Pages |
EXHIBIT 1
JOINT FILING AGREEMENT
The undersigned acknowledge and agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.
DATED: June 14, 2019
| HIGHBRIDGE CAPITAL MANAGEMENT, LLC | ||
| By: | /s/ John Oliva | |
| Name: | John Oliva | |
| Title: | Managing Director | |
| HIGHBRIDGE MSF INTERNATIONAL LTD. | ||
| By: | Highbridge Capital Management, LLC its Trading Manager | |
| By: | /s/ John Oliva | |
| Name: | John Oliva | |
| Title: | Managing Director | |