Use these links to rapidly review the document
PROXY STATEMENT TABLE OF CONTENTS

Table of Contents

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of
the Securities Exchange Act of 1934 (Amendment No.          )

 

---

Table of Contents

March 19, 2018

Dear fellow stockholder:

        You are cordially invited to attend our annual meeting of stockholders on Monday, April 30, 2018. We will hold the meeting at 10:00 a.m., Central time, in the lower level auditorium at our headquarters located at CityPlace One, One CityPlace Drive, St. Louis, Missouri 63141.

        In connection with the annual meeting, we have enclosed a notice of the meeting, a proxy statement and a proxy card. We have also enclosed a copy of our annual report for 2017, which contains detailed information about us and our operating and financial performance.

        If you wish to attend the meeting in person, you will need to obtain an admission ticket in advance. You can request a ticket by following the instructions set forth on page 1 of the proxy statement under the heading "How Do I Gain Admission to the Annual Meeting." I hope that you will be able to attend the meeting, but I know that not every stockholder will be able to do so. Whether or not you plan to attend, I encourage you to vote your shares. You may vote by telephone or via the Internet, or complete, sign and return the enclosed proxy card. The prompt execution of your proxy will be greatly appreciated.

        Thank you for your continued support of Arch Coal. We look forward to seeing you at the annual meeting.

   

ARCH COAL, INC.
1 CityPlace Drive, Suite 300                    St. Louis, Missouri 63141                    t: (314) 994-2700

---

Table of Contents

One CityPlace Drive, Suite 300
St. Louis, Missouri 63141

March 19, 2018

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS
To Be Held April 30, 2018

        The annual meeting of stockholders (the "Annual Meeting") of Arch Coal, Inc., a Delaware corporation (the "Company"), will be held in the lower level auditorium at the Company's headquarters located at CityPlace One, One CityPlace Drive, St. Louis, Missouri 63141 on Monday, April 30, 2018 at 10:00 a.m., Central time, to:

(1)

Elect the seven nominees for director named in the attached proxy statement;



(2)

Vote on an advisory resolution to approve the Company's named executive officer compensation;



(3)

Ratify the appointment of Ernst & Young LLP, independent registered public accounting firm, as the Company's independent auditors for the year ending December 31, 2018; and



(4)

Consider any other business that may properly come before the Annual Meeting or any adjournment(s) or postponement(s) thereof.

        March 6, 2018 has been fixed as the record date for the determination of stockholders entitled to receive notice of and to vote at the Annual Meeting or any adjournment(s) or postponement(s) thereof. If you own shares of common stock as of March 6, 2018, you may vote those shares via the Internet, by telephone or by attending the Annual Meeting and voting in person. If you received your proxy materials by mail, you may also vote your shares by completing and mailing your proxy/voting instruction card. If you wish to attend the Annual Meeting, you must request an admission ticket in advance by following the instructions on page 1 of the proxy statement under the heading "How Do I Gain Admission to the Annual Meeting."

        Your vote is important. Whether or not you plan to attend the Annual Meeting, please cast your vote by telephone or the Internet. If you received a proxy card by mail, you may complete, date and sign the proxy card and return it in the enclosed envelope.

---

Table of Contents

PROXY STATEMENT

TABLE OF CONTENTS

---

i

---

Table of Contents

ii

---

Table of Contents

 

iii

---

Table of Contents

iv

---

Table of Contents

v

---

Table of Contents

QUESTIONS AND ANSWERS ABOUT THE ANNUAL MEETING

When and Where Is the 2018 Annual Meeting of Stockholders Being Held?

        The 2018 annual meeting of stockholders (the "Annual Meeting") of Arch Coal, Inc., a Delaware corporation ("Arch" or the "Company"), will be held on Monday, April 30, 2018. The Annual Meeting will be held at 10:00 a.m., Central time, in the lower level auditorium at the Company's headquarters located at CityPlace One, One CityPlace Drive, St. Louis, Missouri 63141.

Who May Vote at the Annual Meeting?

        Stockholders of the Company on March 6, 2018, the record date for the Annual Meeting, are entitled to receive notice of and to vote at the Annual Meeting or any adjournments or postponements of the Annual Meeting. On the record date, the Company had 20,824,885 shares of Common Stock outstanding, consisting of 20,824,628 shares of Class A Common Stock and 257 shares of Class B Common Stock outstanding.

How Do I Gain Admission to the Annual Meeting?

        If you wish to attend the Annual Meeting, you must be a stockholder on the record date and request an admission ticket in advance. Each stockholder planning to attend the Annual Meeting will be asked to present an admission ticket and a valid photo identification, such as a driver's license or passport. You may request an admission ticket by visiting www.proxyvote.com and following the instructions provided or by calling 1-844-318-0137. You will need the Control Number included on your proxy card, voter instruction form, or notice. Tickets will be issued to registered and beneficial owners and to one guest accompanying each registered or beneficial owner.

        Requests for admission tickets will be processed in the order in which they are received. Please note that seating is limited and will be on a first-come, first-served basis.

        No cameras, camcorders, videotaping equipment, other recording devices, bags or large packages will be permitted in the Annual Meeting. Photographs and/or video may be taken by Company employees or independent contractors at the Annual Meeting, and those photographs and video images may be used by the Company. By attending the Annual Meeting, you will be agreeing to the Company's use of those images and waive any claim or rights with respect to those images and their use.

What Items Will Be Voted On at the Annual Meeting?

        Stockholders will vote on the following items at the Annual Meeting:

•

The election of seven director nominees to the Board of Directors (the "Board") of the Company (Proposal 1);



•

An advisory resolution to approve the Company's named executive officer compensation (Proposal 2); and



•

The ratification of the appointment of Ernst & Young LLP, independent registered public accounting firm, as the Company's independent auditors for the year ending December 31, 2018 (Proposal 3).

1

---

Table of Contents

What Are the Board's Voting Recommendations?

        The Board recommends you vote your shares:

•

"FOR" each of the director nominees to the Board (Proposal 1);



•

"FOR" the advisory resolution to approve the Company's named executive officer compensation (Proposal 2); and



•

"FOR" the ratification of the appointment of Ernst & Young LLP, independent registered public accounting firm, as the Company's independent auditors for the year ending December 31, 2018 (Proposal 3).

How Do I Vote?

        If you are a registered stockholder, you may vote your shares in advance using any of the following voting alternatives:

        By Internet —  You can vote over the Internet at www.proxyvote.com by following the instructions provided (you will need the Control Number from the Notice or proxy card you receive).

        By Telephone —  You can vote by telephone by calling the toll-free number indicated on your proxy card or voting instruction card (you will need the Control Number from the Notice or proxy card you receive).

        By Mail —  If you received your proxy materials by mail, you can vote by signing, dating and returning the accompanying proxy card.

        Alternatively, you may vote your shares in person at the meeting.

        When your proxy is properly submitted, your shares will be voted as you indicate. If you do not indicate your voting preference, the appointed proxies (John W. Eaves and Robert G. Jones) will vote your shares FOR each of the director nominees to the Board under Proposal No. 1, FOR Proposal No. 2 and FOR Proposal No. 3. If your shares are owned in joint names, all joint owners must vote by the same method, and if joint owners vote by mail, all of the joint owners must sign the proxy card. The deadline for voting by telephone or via the Internet, is 11:59 p.m., Eastern time, on the day before the Annual Meeting.

        If you are a beneficial owner of shares held in street name, follow the instructions provided by your nominee to vote your shares. In most instances, you will be able to vote by the same methods as indicated above. You must have a legal proxy from the stockholder of record in order to vote the shares in person at the Annual Meeting.

May I Change My Vote?

        You may revoke your proxy and change your vote at any time before the voting deadline for the Annual Meeting. After your initial vote, you may vote again on a later date any time prior to the Annual Meeting via the Internet or by telephone (only your latest Internet or telephone proxy submitted prior to the voting deadline for the Annual Meeting will be counted), by signing and returning a new proxy card or voting instruction form with a later date, or by attending the Annual Meeting and voting in person. However, your attendance at the Annual

2

---

Table of Contents

Meeting will not automatically revoke your proxy unless you vote again at the Annual Meeting or specifically request in writing that your prior proxy be revoked.

How Many Votes Do I Have?

        You have one vote for each share of the Company's Class A Common Stock and one vote for each share of the Company's Class B Common Stock that you owned at the close of business on the record date. These shares include:

•

Shares registered directly in your name with the Company's transfer agent, for which you are considered the "stockholder of record;" and



•

Shares held for you as the beneficial owner through a broker, bank, or other nominee in "street name."

Is My Vote Confidential?

        Yes. Voting tabulations are confidential except in extremely limited circumstances. Such limited circumstances include contested solicitation of proxies when disclosure is required by law to defend a claim against the Company or to assert a claim by the Company and when a stockholder's written comments appear on a proxy or other voting material.

What Are Broker Non-Votes and How Are They Counted?

        A broker non-vote occurs when a broker, bank, or other nominee holding shares on behalf of a beneficial owner is prohibited from exercising discretionary voting authority for a beneficial owner who has not provided voting instructions. Brokers, banks, and other nominees may vote without instruction only on "routine" proposals. On "non-routine" proposals, nominees cannot vote without instructions from the beneficial owner, resulting in so-called "broker non-votes." Proposal No. 3, the ratification of Ernst & Young, LLP as the Company's independent registered public accounting firm, is the only routine proposal on the ballot for the Annual Meeting. All other proposals are non-routine. If you hold your shares with a broker, bank, or other nominee, they will not be voted on non-routine proposals unless you give voting instructions to such nominee. Broker non-votes are counted as present and entitled to vote for purposes of determining a quorum at the meeting, but are not counted for purposes of determining the number of shares present and entitled to vote on non-routine matters.

What Is the Voting Requirement to Approve Each of the Proposals?

        For Proposal No. 1, the seven nominees receiving the highest number of affirmative votes of the shares entitled to be voted for them will be elected as directors to serve for one-year terms and until their respective successors are duly elected and qualified. Abstentions are not counted for the purpose of the election of directors, and neither abstentions nor broker non-votes will have any effect on the voting results.

        Approval of Proposals No. 2 and No. 3 requires the affirmative vote of a majority of the shares present or represented by proxy and voting at the Annual Meeting. The vote on Proposal No. 2, the approval of the Company's named executive officer compensation, is a non-binding advisory vote only.

3

---

Table of Contents

        Abstentions and broker non-votes are not treated as votes cast. Accordingly, neither abstentions nor broker non-votes will affect the outcome of the voting on Proposals No. 2 and No. 3.

        If a submitted proxy does not specify how to vote, the shares represented by that proxy will be considered to be voted in favor of each of the seven nominees recommended by the Board in Proposal No. 1, and "FOR" each of Proposals No. 2 and No. 3. Unless a stockholder checks the box on the proxy card or provides instructions to withhold discretionary voting authority, the appointed proxies may use their discretion to vote on any other matters properly brought before the meeting. As of the date of this proxy statement, the Company knows of no other matter that will be presented for consideration at the Annual Meeting other than those matters discussed in this proxy statement.

What "Quorum" Is Required for the Annual Meeting?

        In order to have a valid stockholder vote, a quorum must exist at the Annual Meeting. For the Company, a quorum exists when stockholders holding a majority of the outstanding shares of common stock are present or represented at a meeting. For these purposes, shares that are present or represented by proxy at the Annual Meeting will be counted toward a quorum, regardless of whether the holder of the shares or proxy fails to vote on a particular matter or whether a broker with discretionary voting authority fails to exercise such authority with respect to any particular matter.

What Is Householding?

        As permitted by the SEC, the Company may deliver only one copy of this proxy statement and its 2017 annual report to stockholders residing at the same address, unless the stockholders have notified the Company of their desire to receive multiple copies of these documents. This is known as householding.

        The Company will promptly deliver, upon request, a separate copy of the proxy statement or annual report to any stockholder residing at an address to which only one copy was mailed. Requests for separate copies for the current year or future years, or to receive a single copy in the future for shareholders sharing an address, should be directed to the Secretary, Arch Coal, Inc. One CityPlace Drive., Suite 300, St. Louis, Missouri 63141, or by telephone at (314) 994-2700.

Where Can I Find the Voting Results?

        The Company intends to announce preliminary voting results at the Annual Meeting. The Company will publish the final results in a Current Report on Form 8-K, which the Company expects to file within four business days after the Annual Meeting is held. You can obtain a copy of the Current Report on Form 8-K by logging on to the Company's website at archcoal.com, by calling the Securities and Exchange Commission (SEC) at 800-SEC-0330 for the location of the nearest public reference room, or through the EDGAR system at sec.gov. Information on the Company's website does not constitute part of this proxy statement.

4

---

Table of Contents

DIRECTORS AND CORPORATE GOVERNANCE PRACTICES

Overview

        Arch is dedicated to being a global leader in the coal industry and to creating long-term value for the Company's stockholders. It is the Company's policy to conduct the Company's business with integrity and an unrelenting passion for providing the best value to the Company's customers. The Company's key corporate governance materials, including our Corporate Governance Guidelines, Code of Business Conduct and Board committee charters, are published under the "Investors" section of the Company's website at archcoal.com. Information on the Company's website does not constitute part of this proxy statement. The Board regularly reviews these materials and modifies them as warranted based upon Delaware law, the rules and listing standards of the New York Stock Exchange and SEC regulations, as well as best practices recommended by recognized governance authorities.

Board of Directors

        The following individuals were appointed as members of the Board upon the Company's emergence from Chapter 11 in October 2016: James N. Chapman, Patrick J. Bartels, Jr., Sherman K. Edmiston III, Patrick A. Kriegshauser, Richard A. Navarre, Scott D. Vogel and John W. Eaves. All such individuals were re-elected to the Board at the 2017 annual meeting of stockholders for a one-year term, expiring at the 2018 Annual Meeting. All such individuals have been nominated for re-election to the Board at the 2018 Annual Meeting.

Corporate Governance Guidelines and Code of Business Conduct

Corporate Governance Guidelines

        The Company's Corporate Governance Guidelines set forth a framework within which the Board, assisted by its committees, directs the affairs of the Company. These Guidelines address, among other items, the composition and functions of the Board, director independence, compensation of directors, and director qualification standards.

Code of Conduct

        The Company's Code of Business Conduct is applicable to all employees of the Company, including the principal executive officer, the principal financial officer and the principal accounting officer, as well as all directors of the Company.

        The Corporate Governance Guidelines and the Code of Business Conduct are available on the Company's website under the "Investors" section at archcoal.com and in print to any stockholder who requests them from the Company's Secretary. The Company intends to post amendments to or waivers from (to the extent applicable to one of the Company's directors or executive officers) the Code of Business Conduct at the same location on the Company's website. Information on the Company's website does not constitute part of this proxy statement.

Director Independence

        It is the Board's objective to have a substantial number of directors who are independent. The Corporate Governance Guidelines incorporate the criteria established by the New York Stock Exchange to assist the Board in

5

---

Table of Contents

determining whether a director is independent. The Board has determined, in its judgment, that all but one member, John W. Eaves, meet the New York Stock Exchange standards for independence.

        All members of the Company's Audit, Nominating and Corporate Governance and Personnel and Compensation Committees must be independent directors in accordance with the Company's Corporate Governance Guidelines. Members of the Audit Committee must also satisfy a separate SEC independence requirement, which provides that they may not accept, directly or indirectly, any consulting, advisory or other compensatory fee from the Company or any of the Company's subsidiaries other than their directors' compensation.

Leadership Structure and Risk Oversight

        Mr. James N. Chapman has served as the chairman of the Company's Board since October 2016. The Board has no fixed policy with respect to the separation of the offices of chairman and chief executive officer. Instead, the Board retains the discretion to make this determination on a case-by-case basis from time to time as it deems to be in the best interest of the Company and the Company's stockholders at any given time. The Company's current structure is that Mr. Chapman serves as chairman of the Board, and Mr. Eaves serves as chief executive officer of the Company.

        Under the Corporate Governance Guidelines, the Company's non-management directors meet regularly in executive session without management present. The chairman of the Board presides over these executive sessions. However, the Corporate Governance Guidelines provide that, if the chairman of the Board is the chief executive officer, or is not an independent director, the independent directors of the Board shall elect a lead director to lead executive session meetings of the independent members of the Board.

        Our full Board is responsible for oversight of the Company's risk management processes. In fulfilling its risk oversight responsibilities, the Board receives periodic reports on management's enterprise risk assessment process and assessment of current and future risks. To increase the Board's effectiveness, the standing committees of the Board are actively involved in risk oversight. The committees' involvement also allows for a deeper review of specific risks. Each committee reports on its activities to the full Board.

Director Qualifications, Diversity and Biographies

        The Corporate Governance Guidelines provide that the Company's Nominating and Corporate Governance Committee and Board will consider candidates for the Company's Board who possess the following principal qualities: strength of character, an inquiring and independent mind, practical wisdom, and mature judgment. In addition to these qualities, the selection criteria for nomination include recognized achievement, an ability to contribute to some aspect of the Company's business, and the willingness to make the commitment of time and effort required of a director.

        As described in more detail below, the Company's Board believes that each of the Company's directors meets such criteria and has attributes and experience that make him well qualified to serve. In order to find the most valuable talent available to meet these criteria, the Company's Board generally considers candidates diverse in geographic origin, gender, ethnic background, and professional experience (private, public, and non-profit),

6

---

Table of Contents

pursuant to the Company's Corporate Governance Guidelines. The Company's goal is to include members with the skills and characteristics that, taken together, will assure a strong Board.

        The Company's directors have diverse backgrounds and provide experience and expertise in a number of critical areas. The Nominating and Corporate Governance Committee considers the particular experience, attributes, reputation and qualifications of directors standing for re-election and potential nominees for election, as well as the needs of the Company's Board as a whole and its standing committees.

        The Nominating and Corporate Governance Committee has identified nine areas of expertise that are particularly relevant to service on the Board and has identified the directors whose key areas of expertise qualify them for each of the listed categories. The categories identified by the Nominating and Corporate Governance Committee are:

•

CEO/Senior Management — Experience working as a chief executive officer, chief financial officer, chief accounting officer, managing director or other senior officer of a major public or private company or non-profit entity.



•

Industry — Extensive knowledge and experience in the energy, natural resources, metals and mining industries, either as a senior executive of a company in such industries, as a senior executive of a customer serving such industries or through legal or regulatory experience on industry-related matters.



•

Environmental and Safety — A thorough understanding of safety and environmental issues and industry regulations.



•

Finance and Accounting — Senior executive-level experience or membership on a board audit committee with an extensive understanding of finance and accounting matters such as capital markets, corporate finance, M&A, financial accounting and reporting, auditing, Sarbanes-Oxley compliance and internal controls.



•

Governance/Board — Prior or current experience as a board member of a major organization (private, public or non-profit).



•

Government Relations — Experience in or a strong understanding of the workings of government and public policy on a local, state and national level.



•

Human Resources and Compensation — Senior executive-level experience or membership on a board compensation committee with an extensive understanding of compensation programs, particularly compensation programs for executive-level employees and incentive-based compensation programs.



•

Marketing — Senior executive-level experience in marketing combined with a strong working knowledge of the Company's domestic and international markets, customers and strategy.



•

Strategic Planning — Senior executive-level experience in strategic planning for a major public, private or non-profit entity.

7

---

Table of Contents

DIRECTORS NOMINATED FOR ELECTION AT THE ANNUAL MEETING

        The following is a list of the Company's directors, their ages as of April 1, 2018, their occupation during the last five years and certain other biographical information, including the areas of expertise where each director or nominee is most skilled:

8

---

Table of Contents

9

---

Table of Contents

10

---

Table of Contents

Board Meetings and Committees

        During 2017, the Board met 15 times, and each director attended at least 75% of the aggregate of all of the meetings of the Board and the committees of the Board on which he served. Under the Company's Corporate Governance Guidelines, each director is expected to spend the time needed and meet as frequently as necessary to properly perform his duties and responsibilities, including attending the annual stockholders' meeting, Board meetings and meetings of the committees on which he serves. All of the directors attended the Company's 2017 annual meeting of stockholders.

11

---

Table of Contents

Nominating and Corporate Governance Committee

        The Nominating and Corporate Governance Committee is responsible for, among other things, the following items:

•

identifying qualified individuals to stand for election to the Board at the annual stockholders' meeting and recommending candidates for membership on the Board's committees;



•

developing and recommending the Corporate Governance Guidelines to the Board; and



•

reviewing the effectiveness of Board governance, including overseeing an annual assessment of the performance of the Board.

        The Board has determined, in its judgment, that the Nominating and Corporate Governance Committee is composed entirely of independent directors as defined in the New York Stock Exchange listing standards. The Nominating and Corporate Governance Committee operates under a written charter adopted by the Board, a copy of which is published under the "Investors" section of the Company's website at archcoal.com.

Personnel and Compensation Committee

        The Personnel and Compensation Committee is responsible for, among other things, the following items:

•

overseeing the Company's executive incentive compensation and equity-based programs;



•

overseeing the Company's non-employee director compensation program; and



•

monitoring the Company's succession planning and management development practices.

        The Board has determined, in its judgment, that the Personnel and Compensation Committee is composed entirely of independent directors as defined in the New York Stock Exchange listing standards. In making its determination, the Board considered, among other things, the factors applicable to members of the Personnel and Compensation Committee pursuant to New York Stock Exchange listing standards and Rule 10C-1 of the Securities Exchange Act of 1934. The Personnel and Compensation Committee operates under a written charter adopted by the entire Board, a copy of which is published under the "Investors" section of the Company's website at archcoal.com. The report of the Personnel and Compensation Committee can be found under "Personnel and Compensation Committee Report" in this proxy statement.

Audit Committee

        The Audit Committee is responsible for the following items:

•

overseeing the integrity of the Company's financial statements, internal accounting, and effectiveness of financial controls, disclosure controls and financial reporting processes;



•

determining and evaluating the qualifications, independence and performance of the Company's independent registered public accounting firm;



•

overseeing the performance of the Company's internal audit function; and



•

monitoring the Company's compliance with legal and regulatory requirements.

12

---

Table of Contents

        The Audit Committee is directly responsible for the appointment, compensation and oversight of the work of the Company's independent registered public accounting firm. The Board has determined, in its judgment, that the Audit Committee is composed entirely of independent directors in compliance with the New York Stock Exchange listing standards and Rule 10A-3 of the Securities Exchange Act of 1934. The Audit Committee operates under a written charter adopted by the Board, a copy of which is published under the "Investors" section of the Company's website at archcoal.com.

        The Board has determined, in its judgment, that all three members of the Audit Committee are "financially literate" and are "audit committee financial experts" for purposes of the SEC regulations. Under the Audit Committee's charter, no member of the committee may serve on more than two other public company audit committees unless the Board determines that such simultaneous service will not impair the ability of the member to serve effectively on the committee. None of the members of the Audit Committee currently serve on the audit committees of more than two other public companies. The report of the Audit Committee can be found under "Audit Committee Report" in this proxy statement.

Board and Committee Self-Assessments

        The Board conducts annual self-evaluations to determine whether it and its committees are functioning effectively and whether its governing documents continue to remain appropriate. Each committee also annually reviews its own performance and assesses the adequacy of its charter and reports the results and any recommendations to the Board.

Director Retirement/Resignation Policies

        The Corporate Governance Guidelines require any nominee for director in an uncontested election who receives a greater number of votes "withheld" from his election than votes "for" such election to offer his resignation to the Board. In the event a resignation is tendered, the Nominating and Corporate Governance Committee and the Board will evaluate the best interests of the Company and its stockholders and make a determination on the action to be taken with respect to such offered resignation, which may include (i) accepting the resignation, (ii) maintaining the director but addressing the underlying cause of the withheld votes, (iii) resolving that the director will not be re-nominated in the future for election, or (iv) rejecting the resignation. Following a determination by the Board, the Company will disclose the Board's decision in a filing with the SEC, a press release, or another broadly disseminated means of communication. The Corporate Governance Guidelines require the Board to nominate for election or re-election only those candidates who agree in advance in writing to tender a resignation letter in accordance with these terms. Each nominee for election at the Annual Meeting has agreed to follow this policy as set forth in the Corporate Governance Guidelines.

        The Corporate Governance Guidelines also provide that outside directors tender their resignation for consideration by the Board following such director's 72nd birthday.

        Vacancies on the Board may be filled by a majority of the remaining directors. A director elected to fill a vacancy, or a new directorship created by an increase in the size of the Board, serves until the next annual meeting of stockholders and until his successor shall be elected and shall qualify, subject, however, to prior death, resignation, incapacitation or removal from office, and except as otherwise required by law.

13

---

Table of Contents

Conflicts of Interest

        The Company's Code of Business Conduct reflects the Company's policy that all of the Company's employees, including the Company's named executive officers and directors must avoid any activity that creates, or may create, a conflict of interest that might interfere with the proper performance of their duties or that might be hostile, adverse or competitive with the Company's business. In addition, each of the Company's directors and executive officers is encouraged to notify the Company's Board when confronted with any situation that may be perceived as a conflict of interest, even if the person does not believe that the situation would violate the Company's Code of Business Conduct or Corporate Governance Guidelines. The Board will then determine, after consultation with counsel, whether a conflict of interest exists. Directors who have a material personal interest in a particular issue may not vote on any matters with respect to that issue.

Compensation Committee Interlocks and Insider Participation

        James N. Chapman, Patrick J. Bartels, Jr. and Scott D. Vogel each served on the Personnel and Compensation Committee during 2017. None of the directors who served on the Personnel and Compensation Committee during 2017 has been an officer or employee of the Company. None of the Company's executive officers has served on the board of directors or compensation committee of any other entity that has or has had one or more executive officers serving as a member of the Company's Board or Personnel and Compensation Committee. See "Transactions with Related Persons" below for certain transactions involving Mr. Bartels.

Nomination Process for Election of Directors

        The Nominating and Corporate Governance Committee has responsibility for assessing the need for new directors to address specific requirements or to fill a vacancy. All candidates must meet the requirements specified in the Company's Corporate Governance Guidelines. Candidates who meet those requirements and otherwise qualify for membership on the Company's Board are identified, and the committee initiates contact with preferred candidates. The committee regularly reports to the Board on the progress of the committee's efforts. The committee meets to consider and approve final candidates who are then presented to the Board for consideration and approval. The Company's chairman or the chairman of the Nominating and Corporate Governance Committee may extend an invitation to join the Board.

        Stockholder recommendations must be submitted in writing to Robert G. Jones, the Company's Secretary, and must include information regarding nominees required under the Company's Bylaws. Individuals properly recommended by stockholders will receive the same consideration received by individuals identified to the Nominating and Corporate Governance Committee through other means.

        The Company's Bylaws include a proxy access provision that allows stockholders who meet the requirements set forth in the Bylaws to include a specified number of director nominees in the Company's proxy materials.

Communicating With the Board of Directors

        The Company's Board has established procedures intended to facilitate communication by stockholders and interested parties directly with the Board as a whole, any of the Company's Board committees, the chairman of the Board, any other individual director or group of directors, including the Company's non-employee directors as a whole. Such communications may be confidential or anonymous, and may be reported by phone to the

14

---

Table of Contents

Company's confidential hotline at 866-519-1881 or by writing to the individual directors or group in care of Arch Coal, Inc., One CityPlace Drive, Suite 300, St. Louis, Missouri 63141, Attention: Senior Vice President-Law, General Counsel and Secretary. All such communications are promptly communicated to the chairman, lead director, the chairman of the Audit Committee or the Company's director of internal audit, as appropriate.

15

---

Table of Contents

ELECTION OF DIRECTORS
(PROPOSAL NO. 1)

        All seven of our current directors are up for election at the 2018 Annual Meeting. Upon the recommendation of the Nominating and Corporate Governance Committee, the Board has nominated each of our current directors: Patrick J. Bartels, Jr., James N. Chapman, John W. Eaves, Sherman K. Edmiston III, Patrick A. Kriegshauser, Richard A. Navarre and Scott D. Vogel, for re-election for a term that will expire at the 2019 Annual Meeting, until a successor is elected and qualified or until his earlier death, resignation or removal.

        To the knowledge of the Board, no nominee will be unwilling or unable to serve as a director. All nominees have consented to be named in this proxy statement and to serve if elected. If, however, a nominee is unavailable for election, your proxy authorizes the Company to vote for a replacement nominee if the Board names one. As an alternative, the Board may reduce the number of directors to be elected at the Annual Meeting.

Recommendation of the Board

        The Board recommends a vote "FOR" each nominee.

16

---

Table of Contents

ADVISORY VOTE TO APPROVE NAMED EXECUTIVE OFFICER COMPENSATION
(PROPOSAL NO. 2)

        Pursuant to Section 14A of the Securities Exchange Act of 1934, as amended, we are seeking advisory stockholder approval of the compensation of our named executive officers ("NEOs"), or "say-on-pay" vote, as disclosed in the section of this proxy statement entitled "Executive Compensation." Stockholders are being asked to vote on the following advisory resolution:

        "RESOLVED, that the stockholders approve, on an advisory basis, the compensation of Arch Coal, Inc.'s named executive officers, as disclosed pursuant to the compensation disclosure rules of the Securities and Exchange Commission (which disclosure includes the Compensation Discussion and Analysis, the compensation tables, and any related material)."

        The compensation of our NEOs is designed to tie a substantial percentage of each officer's compensation opportunity to the attainment of financial and other performance measures that the Board believes promote the creation of long-term stockholder value and position the Company for long-term success. As described more fully in the Compensation Discussion and Analysis ("CD&A"), the total mix of compensation that the Company offers its NEOs is designed to enable the Company to attract and maintain top talent while, at the same time, creating a close relationship between performance and compensation. The Personnel and Compensation Committee and the Board believe that the design of the program, and as a result the compensation awarded to NEOs under the current program, fulfills this objective.

        Stockholders are urged to read the CD&A section of this proxy statement, the compensation tables and accompanying narratives, which discuss in detail how our compensation policies and procedures implement our compensation philosophy.

        Although the vote on this Proposal No. 2 is non-binding, the Board will review the voting results in connection with its ongoing evaluation of the Company's compensation program. The final decision on the compensation and benefits of our NEOs remains with the Board. The Board has adopted a policy that provides for this vote annually. At our last annual meeting, our stockholders voted, on an advisory basis, to hold annual "say-on-pay" votes.

Recommendation of the Board

        The Board recommends a vote "FOR" the following resolution at the Annual Meeting:

        "RESOLVED, that the stockholders approve, on an advisory basis, the compensation of Arch Coal, Inc.'s named executive officers, as disclosed pursuant to the compensation disclosure rules of the Securities and Exchange Commission (which disclosure includes the Compensation Discussion and Analysis, the compensation tables, and any related material)."

17

---

Table of Contents

RATIFICATION OF THE APPOINTMENT OF
INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
(PROPOSAL NO. 3)

        Ernst & Young LLP was the Company's independent registered public accounting firm for 2017. The Audit Committee has appointed Ernst & Young LLP as the Company's independent registered public accounting firm for 2018. The Audit Committee and the Board are requesting that stockholders ratify this appointment. In the event the stockholders do not ratify the selection of Ernst & Young LLP, the Audit Committee will reconsider its selection. Even if the selection is ratified, the Audit Committee, in its discretion, may direct the appointment of a different independent registered public accounting firm at any time during the fiscal year if the Audit Committee believes such a change would be in the Company's best interests and the best interests of the Company's stockholders. Representatives of Ernst & Young LLP are expected to be available at the Annual Meeting to make a statement if they desire to do so and to be available to respond to appropriate questions.

Fees Paid to Auditors

        The following table sets forth the fees accrued or paid to Ernst & Young LLP, the Company's independent registered public accounting firm, for the years ended December 31, 2017 and December 31, 2016:

        The Audit Committee has adopted an audit and non-audit services pre-approval policy that requires the Audit Committee to pre-approve services to be provided by the Company's independent registered public accounting firm. The Audit Committee will consider whether the services to be provided by the independent registered public accounting firm are prohibited by the SEC's rules on auditor independence and whether the independent registered public accounting firm is best positioned to provide the most effective and efficient service. The Audit Committee is mindful of the relationship between fees for audit and non-audit services in deciding whether to pre-approve such services. The Audit Committee has delegated to the chairman of the Audit Committee pre-approval authority between committee meetings, and the chairman must report any pre-approval decisions to the committee at the next regularly scheduled committee meeting. All non-audit services performed by Ernst & Young LLP in 2017 and 2016 were pre-approved in accordance with the procedures established by the Audit Committee.

Recommendation of the Board

        The Board recommends a vote "FOR" the ratification of the appointment of Ernst & Young LLP as the Company's independent registered public accounting firm for the year ending December 31, 2018.

18

---

Table of Contents

OTHER MATTERS

        The Company knows of no other matters to be submitted to the stockholders at the Annual Meeting. If any other matters properly come before the stockholders at the Annual Meeting, it is the intention of the persons named on the proxy to vote the shares represented thereby on such matters in accordance with their best judgment.

EXECUTIVE COMPENSATION

Compensation Discussion and Analysis

        This Compensation Discussion and Analysis describes the material elements of compensation paid to each of the following named executive officers of Arch Coal, Inc. (the "named executive officers" or "NEOs"), for fiscal year 2017:

EXECUTIVE SUMMARY

        Our NEOs' compensation for 2017 was focused on incentivizing our NEOs to create long-term value for our stockholders and other stakeholders. On January 11, 2016, we filed voluntary petitions for relief under Chapter 11 of the Bankruptcy Code ("Chapter 11"), and on October 5, 2016, we emerged from Chapter 11 as a restructured company. Following our Chapter 11 restructuring, which was focused primarily on strengthening our balance sheet and creating a strong foundation for a sustainable financial future, we accomplished the following goals in 2017:

•

Returned $326 million to stockholders through two new capital deployment initiatives:



•

Executed on our share repurchase program, purchasing approximately 4 million shares of common stock, representing 16% of shares outstanding, for a total of $302 million.



•

Paid $24 million in quarterly cash dividends.



•

Further strengthened our financial position:



•

Refinanced the Company's senior secured term loan, reducing annual interest expense by $20 million, or nearly 50%, while extending the debt maturities by more than two years.



•

Entered into a new inventory-only asset based lending ("ABL") facility and amended our existing accounts receivable securitization facility, resulting in $200 million of aggregate capacity.

19

---

Table of Contents

•

Reduced collateral requirements and increased borrowing capacity, resulting in the return of over $100 million of cash held by counterparties.



•

Divested our highest-cost mine, as well as two other idled properties in Appalachia, further strengthening our key metallurgical segment and allowing us to focus on our core coking coal operations.



•

Continued to deliver industry-leading safety and environmental performance:



•

Our total-incident rate for 2017 was more than two times better than the national coal industry average.



•

We achieved a Company-best performance in 2017 in environmental stewardship, delivering near-perfect annual performance with respect to air and water quality compliance.



•

We received two of the three national awards issued by the Department of Interior's Office of Surface Mining; one award for excellence in surface coal mining reclamation and the other for our leadership in partnering with industry and conservation groups to protect and enhance the Wyoming prairie landscape.

2017 Key Compensation Decisions and Actions

        Our key compensation decisions and actions relating to our NEOs' compensation for 2017 included the following:

•

Base salary amounts.  Our NEOs did not receive an increase in base salary in 2016 or 2017.



•

2017 annual incentive compensation plan ("ICP") payouts.  Our 2017 budget and strategic objectives, as well as our core operating values of safety and environmental stewardship, were considered when establishing our 2017 ICP. The metrics under the 2017 ICP were Adjusted EBITDA (70%), safety incident rate (15%) and environmental compliance (15%). In addition to payouts for these key metrics, the Board awarded an additional performance bonus to our NEOs and other executives in recognition of their exceptional performance in achieving the goals outlined above in the Executive Summary to strengthen the Company's financial position and increase shareholder value.



•

2017 long-term incentive grants.  The LTIP component of compensation was granted in two forms of equity grants:



•

performance-based restricted stock units (50%), which are based upon the volume weighted average price ("VWAP") of a share of our common stock for any 45-day trading window during a three-year performance period; and



•

time-based restricted stock units (50%), which cliff vest on the third anniversary of the grant date.



•

Retention program.  In 2015, our prior Board approved and we entered into retention agreements with each of our NEOs given the uncertainty and challenging times in the coal industry. The final payment under those agreements was made in November 2017.

20

---

Table of Contents

Overview

        Prior to our emergence from Chapter 11 in October 2016, our executive compensation programs were administered by our prior Board. Following our emergence from Chapter 11, we generally continued our existing compensation programs, which are designed to attract, motivate and retain highly talented executives, except that such programs are focused on promoting our strategic objectives following such emergence and are implemented and administered by our post-emergence Board. We believe these compensation programs encourage sustained long-term profitability by making a significant portion of each named executive officer's total direct compensation variable and dependent on our achievement of safety, environmental and financial performance. Thus, most of our executives' total compensation is performance-based and not guaranteed.

        The type and amount of compensation for each NEO is determined after considering a variety of factors, including the executive's position and level of responsibility within our organization, comparative market data and other external market-based factors. The Personnel and Compensation Committee, or the Committee, uses this information when establishing compensation in order to achieve a comprehensive package that emphasizes pay-for-performance and is competitive in the marketplace. For the 2017 fiscal year, the pay mix at target for the CEO and other NEOs is displayed below.

21

---

Table of Contents

        The components of the NEO compensation program for 2017 were as follows:

Our Compensation Process

        The Committee, with advice and analysis from its independent compensation consulting firm, uses current compensation levels and benchmarking and other data of peer companies, individual and Company performance, long-term career goals, future leadership potential and succession planning, among other factors, in determining appropriate target compensation levels for our NEOs. The Committee does not use a formula to weight these factors, but, instead, uses these factors to provide context within which to assess the significance of comparative market data and to differentiate the level of target compensation among our NEOs.

        After the end of the performance period to which a particular incentive award relates, the Committee reviews our performance relative to the applicable performance targets and recommends payouts based on that performance. The Committee generally retains discretion to recommend payouts that are above or below actual performance levels for the applicable performance period. However, if the Committee determines that an award should be treated as performance-based compensation under Section 162(m) of the Code, then the Committee forgoes its discretion to increase the award payout. For purposes of determining the amount of a payout to recommend, the Committee may also consider infrequent or non-recurring items that are not reflective of ongoing operations, the effects of major corporate transactions or other items that the Committee determines, in its judgment, significantly distort the comparability of our actual performance against the performance targets.

22

---

Table of Contents

        Annually, the Committee reviews the design of our named executive officer compensation program, including whether the risks arising from our compensation policies and practices are reasonably likely to have a material adverse effect on the Company. In doing so, the Committee assesses whether compensation programs used in prior years have successfully achieved our compensation objectives. The Committee also considers the extent to which our compensation program is designed to achieve our long-term financial and operating goals. The Committee has retained the independent compensation consultant referenced below under "Role of Compensation Consultants" to help analyze certain comparative market data. Certain members of management participate in this process by assembling and summarizing data used by the Committee. The Committee and its independent compensation consultant reviewed our compensation policies and practices, and the Committee has determined that the risks arising from our compensation policies and practices are not reasonably likely to have a material adverse effect on the Company. In 2017, the Company prepared "tally sheets" that summarize the past and present values of each component of each NEO's total compensation. This tool is available to assist Committee members in the evaluation and approval of changes to compensation.

Role of Compensation Consultants

        During 2017, the Committee continued to retain Lyons, Benenson & Company Inc. ("LB") as an independent compensation consultant to advise on executive compensation matters. LB assisted the Committee in determining the compensation peer group, which is described in more detail below. LB also advised the Committee on competitive compensation practices, mix of compensation elements and comparative market data, which the Committee considered in addressing and determining the appropriate levels of compensation for each NEO relative to the marketplace.

        The Committee has reviewed the independence of its independent compensation consultant and has determined that no conflicts of interest exist. The Committee has sole authority to retain or replace the independent compensation consultant. The Committee regularly reviews the performance and independence of its independent compensation consultant, as well as fees paid. A representative of the independent compensation consultant attends committee meetings as requested to serve as a resource on compensation matters. In order to encourage independent review and discussion of compensation matters, the Committee has the authority to, and does from time to time, meet with such representative in executive session.

Role of Management

        Our chief executive officer and our vice president of human resources receive compensation peer group information from the independent compensation consultant, and then provide the Committee with compensation recommendations for our NEOs, other than our chief executive officer, including base salary, annual cash incentive opportunity and long-term incentive opportunities. Management provides a current market value for each proposed element of compensation and for the total target value, as well as the median and other select percentile market values for the NEO's peers. Our chief executive officer does not recommend his own base salary or target or actual payout amounts under our annual or long-term incentive awards.

        Annually, the Committee reviews the performance of our chief executive officer and makes recommendations to the Board regarding his compensation. In doing so, the Committee uses information provided by the independent compensation consultant and certain historical financial and operating performance data provided by

23

---

Table of Contents

management. The Committee believes that the compensation opportunities provided to our chief executive officer, while higher in the aggregate than compensation provided to our other executives, are appropriate taking into consideration our chief executive officer's overall leadership responsibilities.

Compensation Peer Group

        In October 2016, the Committee, in consultation with LB, decided upon a peer group of companies (listed below) based primarily upon criteria including size (both in terms of revenues and market capitalization), business alignment, industry relevance and competition for executive talent. The Committee continued to use this compensation peer group during 2017, except Spectra Energy Corp. was removed from our peer group due to its acquisition. This peer group has median revenues of approximately $2.0 billion (with a range of $800 million to $4.7 billion) and median market capitalization of approximately $2.4 billion (with a range of $18 million to $29.2 billion). We recognize that the companies in this group generally are larger than we are under both of these measures; nevertheless, we view this peer group as appropriate in light of the importance we ascribe to providing competitive compensation opportunities that are sufficient to attract and retain the talented executives needed to lead the Company.

        When evaluating benchmark data for these peer companies, the median market data is applied to each individual pay component in addition to a total compensation analysis. In addition, general industry compensation data is also reviewed by the Committee to provide an additional reference point. This data is based on a broad spectrum of public companies (excluding financial services and retail companies) that had median revenues similar to the Company.

        The Committee assesses the appropriateness of the peer groups used to benchmark our compensation programs on an annual basis and adds or subtracts members of the peer groups as appropriate.

Evaluation of Stockholder "Say on Pay" Vote Results

        This year we are again providing shareholders with the right to cast a non-binding advisory vote to approve the compensation of our NEOs (see "Proposal No. 2 — Advisory Vote to Approve Named Executive Officer Compensation"). Approximately 88% of the votes cast at our 2017 annual meeting of stockholders voted to approve our executive compensation programs and policies, reflecting our stockholders' support of our executive compensation program. The Committee continues to engage with stockholders and other stakeholders and take their feedback, as well as the results of the "say on pay" vote, into account when establishing or modifying our compensation programs.

24

---

Table of Contents

Elements of Our Compensation Program

        The Committee believes that our named executive officers, together with our other executives who have an ability to influence the achievement of our financial and operating objectives, should have a higher percentage of total compensation that is variable and, therefore, subject to greater risk. This provides closer alignment between those executives' total compensation with the short- and long-term interests of stockholders and other stakeholders.

        In order to achieve the compensation objectives established by the Committee, the Company uses the following compensation elements:

•

Base salary;



•

Short-term incentive opportunities (the Annual Incentive Compensation Program);



•

Long-term incentive opportunities (the Long-Term Incentive Program); and



•

Certain other limited executive benefits.

        In general, as the position and amount of responsibility for an executive increase, a greater percentage of that executive's total compensation will be variable. Executives with the highest level and amount of responsibility generally have the lowest percentage of their total compensation fixed as base salary and the highest percentage of their total compensation dependent upon our performance, as reflected in short- or long-term incentive awards.

        The following table shows the allocation of total target compensation for each NEO for each of the last three years:

Base Salary —

        We provide each named executive officer with an annual base salary. Base salaries for our named executive officers depend on each executive's experience and scope of responsibilities as well as the median market data for comparable job positions at companies within our peer group. We increase base salary primarily in response to notable achievements or for additions in scope of responsibilities. In addition, we may increase base salary to remain competitive in the marketplace.

25

---

Table of Contents

        During 2017, as part of the Committee's annual compensation review process, the Committee determined that the base salaries for our NEOs should not be increased. Our NEOs have not received base salary increases since 2015.

Annual Incentive Compensation Program —

Overview —

        The Committee designed the Annual Incentive Compensation Program to focus our organization on meeting and exceeding certain annual financial and operating objectives by rewarding those key employees with the greatest ability to influence our results.

        For 2017, the Committee utilized Adjusted EBITDA, which constitutes 70% of the total target award, and environmental and safety measures, which each constitute 15% of the total target award. The environmental and safety measures continue to be part of the 2017 program because these goals reflect our core values. The Committee returned to the plan design features and maximum payout opportunity in place prior to our Chapter 11 restructuring by increasing the maximum payout opportunity of the Adjusted EBITDA measure to 200% of target (for 2016, there was no above-target payout opportunity for this performance measure).

        Early each year, the Committee determines the compensation plan design for the annual cash incentives based on performance from the prior year, as well as other factors. The Committee recommends the annual plan design, as well as the performance targets, to the Board for approval. Annual cash awards contain various incentive levels based on the participant's accountability and impact on our performance, with target opportunities established as a percentage of base salary based on the median market data.

        The following table shows the target opportunities available to the NEOs as a percentage of their base salaries and the actual payouts as a percentage of their base salaries for each of the last three years:

26

---

Table of Contents

        The following table shows the performance measures used in the 2017 Annual Incentive Compensation Program for our NEOs, together with the percentage of the total annual cash incentive grant that such component comprises. Each of the components for the NEOs is described in greater detail below.

        We believe that these performance measures align our compensation packages with both stockholder and employee interests by targeting specific performance goals and operational standards. By identifying meaningful performance measures and by assigning certain measures greater weight, we are able to more closely align compensation to the achievement of those business objectives over which particular employees have the greatest impact.

        If the target level of performance is achieved with respect to a particular performance measure, the applicable payout percentage for that performance measure will equal 100%. Achievement at the threshold performance level results in an applicable payout percentage that varies based on the performance measure, as shown in the table below. If the maximum level of performance is achieved with respect to a particular performance measure, the payout percentage for that measure will equal 200% of target performance. We interpolate payouts under the annual cash incentive awards for performance levels that fall between the threshold, target and maximum performance levels. There is no payout for performance that does not meet the threshold level criteria.

Adjusted EBITDA —

        For 2017, the Company established a budget, including Adjusted EBITDA. "Adjusted EBITDA" is determined based on our earnings before interest, taxes, depreciation and amortization, on a consolidated basis in accordance with generally accepted accounting principles, and excludes items such as acquisition-related expenses and amortization of acquired sales contracts. The Committee reviewed the budget approved by the Board and set the "target" level of this component based on that budget. In 2017, "target" level was set at 100% of budget. The threshold payout value for 2017 was set at 70% of the Adjusted EBITDA budget and the maximum payout value

27

---

Table of Contents

was set at 130% of the Adjusted EBITDA budget. The following table shows the threshold, target and maximum levels for the 2017 Annual Incentive Compensation Program.

Safety Incident Rate —

        Safety is an important emphasis for the Company and, the Board believes, each of the Company's stakeholders. Strong safety performance leads to improved employee performance and lower costs associated with regulatory citations, insurance and litigation matters, which in turn lead to improved operating performance. Because of these factors, the Committee uses Safety Incident Rate as a component of the annual incentive compensation program. "Safety Incident Rate" is determined based on the Company's historical performance and is the number of reportable injuries per 200,000 man hours. The "target" goal for 2017 was set at the Company's three-year average, while the threshold and maximum goals were set at 10% higher than the Company's three-year average and 10% improvement over the Company's three-year average, respectively. In addition, there is no payout for this performance measure if there is a work-related fatality during the fiscal year. The following table shows the threshold, target and maximum levels for the 2017 Annual Incentive Compensation Program.

Environmental Compliance —

        Like safety, environmental compliance is an important goal for the Company. Improved environmental compliance can improve the areas in which our employees live and operate and reduce long-term costs and expenses associated with fines, remediation issues and litigation matters. The Committee has established an environmental compliance component based on Notices of Violation, or NOVs, received by the Company and its subsidiaries. Similar to the safety component, the "target" goal for 2017 was set at the Company's three-year average, while the threshold and maximum goals were set at 10% higher than the Company's three-year average and 10% improvement over the Company's three-year average, respectively. The following table shows the threshold, target and maximum levels for the 2017 Annual Incentive Compensation Program.

28

---

Table of Contents

2017 Payout Under the Annual Incentive Compensation Program

        In early 2018, the Committee evaluated the level of achievement of the various performance measures for 2017 and made the following determinations:

        Based on the actual performance as set forth above, the cumulative amounts listed below were earned under the 2017 Annual Incentive Compensation Program for the Company's 2017 performance.

Additional Performance Bonuses

        In addition to the amounts earned under the 2017 Annual Incentive Compensation Program performance measures described above, the Board awarded an additional performance bonus to the NEOs and other executives in recognition of their exceptional performance in achieving the 2017 financial and shareholder value goals following our emergence from Chapter 11 in October 2016, as outlined in the Executive Summary. These bonus amounts are set forth below in the Summary Compensation Table and reflect the Board's subjective determination of each NEO's contribution to our overall 2017 performance.

Long-Term Incentive Program

Overview —

        The Committee designed our long-term incentive program to promote decision-making that creates long-term value for our stockholders and other stakeholders. The Committee believes that an effective LTIP should also create strong retention incentives for those key employees who are most likely to influence our long-term performance.

        The following table shows the components of our long-term incentive program for each of the last three years, together with the percentage associated with such portion of the award compared to the total award granted in that year. Long-term incentive awards contain various incentive levels based on the participant's

29

---

Table of Contents

accountability and potential influence on our performance, with target opportunities established as a percentage of base salary based on the median market data.

2017 Grants —

        On November 30, 2017, each of our NEOs received two awards of restricted stock units ("RSUs") as follows:

        The time-based and performance-based RSU awards vest on the third anniversary of the grant date. The performance-based RSU award is earned based on the VWAP of a share of our common stock for any 45-day trading period during the three-year performance period (the "45-day VWAP"), subject to achieving threshold performance of a 45-day VWAP of no less than $88. On the date of grant, the 45-day VWAP was $75.65. The NEOs may earn up to 150% of the target number of performance-based RSUs based on achievement of 45-day VWAP performance levels that the Committee determined were appropriately challenging.

        The 2017 RSU awards are the first regular long-term incentive awards granted since our emergence from Chapter 11 in October 2016.

30

---

Table of Contents

2015 - 2017 Performance Unit Award Achievement —

        Our compensation program for 2015 included long-term incentive awards of performance shares, restricted stock units and performance units for the 2015 - 2017 performance period. The performance share and restricted stock unit awards were canceled without any payout to the NEOs upon our emergence from Chapter 11. The performance unit awards, which are tied to our safety and environmental performance and had historically paid out in cash, were not canceled. In early 2018, the Committee evaluated the level of achievement of the various performance measures for the 2015 - 2017 performance period and made the following determinations for such performance unit awards:

        Total actual amounts paid to each NEO under the 2015 performance unit awards for the Company's 2015 - 2017 performance are set forth in the footnotes to the Summary Compensation Table below.

Other Benefits

        Executive Benefits —  We provide a limited number of executive benefits such as financial planning services to our NEOs and certain other key employees. The purpose of these benefits is to attract and retain executives with a comprehensive compensation package. Executive benefits are taxable to the executives. Executives do not receive any tax gross up payments on these benefits.

        Participation in Benefit Plans and Other Compensation Arrangements —  Each of our NEOs is eligible to participate in the same health and welfare plans as our other eligible employees. These plans include medical and dental insurance, life, travel and accidental death and dismemberment insurance, short- and long-term disability coverage and participation in our qualified defined benefit pension plan (which was frozen at the end of 2014) and a 401(k) plan. The following is a summary of certain benefit plans and other compensation arrangements available to our NEOs but for which our other employees generally may not be eligible:

        Supplemental Retirement Plan Benefits —  The Internal Revenue Code (the "Code") limits the amount of qualified retirement benefits we may provide for certain employees. As a result, we sponsor a supplemental retirement plan that provides eligible employees, including the NEOs, with additional retirement benefits that would otherwise be available under our defined benefit pension plan but for the limitations contained in the Code. We froze this supplemental retirement plan on December 31, 2014, the same date that we froze our defined benefit pension plan. No participants earn any service credit after such date. For more information about our defined benefit pension plan and our supplemental retirement plan, including the accumulated benefits attributable to our NEOs, see "Pension Benefits" below.

        Non-Qualified Deferred Compensation Plan —  The Code limits the amount certain of our employees may contribute to our tax-qualified 401(k) plan in any year. Therefore, we sponsor a non-qualified deferred compensation plan that allows eligible employees, including the NEOs, to defer receipt of a portion of their base salaries and certain annual and long-term cash incentive awards not subject to these limits. The deferred compensation plan provides higher-paid employees with the full Company matching contribution to which they

31

---

Table of Contents

would otherwise be entitled under our defined contribution plan but for the limitations contained in the Code. NEOs were not allowed to make deferrals under the non-qualified plan for 2017. For more information about our deferred compensation plan, including information about amounts attributable to our NEOs, see "Non-Qualified Deferred Compensation" below.

        Change in Control Agreements —  To provide our NEOs and certain other key employees with some financial security in the event their employment with our organization is terminated without cause or under certain circumstances following a change in control, we provide the executives with change in control agreements that provide for cash payments and certain other severance benefits upon a qualifying termination. We believe that the change in control agreements we maintain with our executives provide a meaningful mechanism by which to retain those individuals who are most capable of affecting our future performance. The agreements were developed and entered into in the years prior to our Chapter 11 filing and were assumed by the Company on our emergence from Chapter 11. The agreements were not modified during the Chapter 11 case, except that the NEOs agreed to waive the first trigger under the agreements, such that our Chapter 11 reorganization did not constitute a change in control for purposes of the agreements. As a result, our NEOs will only receive enhanced change in control payments and benefits under the agreements if their employment is involuntarily terminated in connection with a subsequent change in control. For more information about the change in control agreements with our NEOs, see "Potential Payments Upon Termination of Employment or Change in Control" below.

        Retention Agreements —  To maintain stability for the Company during a volatile time for our industry, in July 2015, our prior Board approved and we entered into retention agreements with each of our NEOs and certain other key employees. The agreements provided that, subject to the conditions set forth therein, each employee was eligible to receive quarterly cash retention payments for up to a total of 27 months if his employment continued. To encourage retention through the entire period, the payments were backloaded, with each of the first eight quarterly payments equaling 9.375% of the total possible retention award, and the final quarterly payment equaling 25% of the total possible award. If an employee's employment was terminated for any reason other than by us without "cause" or by the employee for "good reason" (as such terms are defined in the retention agreement), any unpaid retention payments under the agreement were forfeited. The total possible retention award originally equaled two times base salary for each of Messrs. Eaves, Drexler and Lang, and 1.5 times base salary for each of Messrs. Cochran and Jones. We paid the first quarterly installment under the retention agreements to the NEOs and other employees prior to our Chapter 11 filing. We were prohibited from making scheduled payments under the retention agreements to the NEOs during our Chapter 11 case, which resulted in a 28% reduction in the aggregate amount payable to each NEO. We resumed scheduled payments upon our emergence from Chapter 11 (excluding the 28% reduction) and made the final payment under the retention agreements in November 2017.

Stock Ownership Guidelines

        Following our emergence from Chapter 11 in 2016, our Board adopted stock ownership guidelines, which superseded the guidelines previously in effect and which are intended to promote meaningful stock ownership by our NEOs. These guidelines specify a number of shares of our common stock, including unvested RSUs, that our NEOs must accumulate within the later of five years of the implementation of the guidelines or their first

32

---

Table of Contents

receiving an equity grant. The specific shareholding guidelines are determined based on a multiple of base salary, as follows:

Anti-Hedging and Anti-Pledging Policy

        Each of our NEOs and directors is subject to the terms of our securities trading policies. Those policies prohibit entering into hedging transactions involving our stock, including trading in or writing "puts" and "calls" or engaging in "short sales," "margining" or any other action designed to offset any change in the value of the Company's stock. Those policies also prohibit NEOs and directors from pledging any Company securities.

Impact of Section 162(m) on Compensation

        Prior to the Tax Cuts and Jobs Act ("Tax Reform") that was signed into law December 22, 2017, Section 162(m) of the Code generally limited to $1 million the U.S. federal income tax deductibility of compensation paid in one year to a company's CEO or any of its three next-highest-paid executive officers (other than its Chief Financial Officer). Compensation that qualified as "performance-based" under Section 162(m) of the Internal Revenue Code was exempt from this $1 million limitation. As part of Tax Reform, the ability to rely on this "qualified performance-based compensation" exception was eliminated, and the limitation on deductibility was generally expanded to include all named executive officers. Although we maintain compensation arrangements that were intended to qualify as performance-based compensation under Section 162(m) of the Internal Revenue Code prior to Tax Reform, subject to certain transition relief rules, we may no longer take a deduction for any compensation paid to our covered employees in excess of $1 million. Furthermore, although the Committee may have taken action intended to limit the impact of Section 162(m) of the Internal Revenue Code, it also believes that the tax deduction is only one of several relevant considerations in setting compensation. The Committee believes that shareholder interests are best served by not restricting the Committee's discretion and flexibility in structuring compensation programs, even though such programs may result in non-deductible compensation expenses. Accordingly, achieving the desired flexibility in the design and delivery of compensation may have resulted (and may continue to result, in light of the recent changes in law) in compensation that in certain cases is not deductible for federal income tax purposes.

33

---

Table of Contents

2017 Summary Compensation Table

        The following table is a summary of compensation information for our chief executive officer, our chief financial officer and each of the other three most highly compensated executive officers for the fiscal year ended December 31, 2017. Amounts shown that were awarded prior to our emergence from Chapter 11 in October 2016 were approved and implemented by our prior Board. Any compensation amounts awarded following our emergence from Chapter 11 reflect the administration of our executive compensation plans and programs by our new Board appointed following such emergence.

34

---

Table of Contents

35

---

Table of Contents

Grants of Plan-Based Awards for the Year Ended December 31, 2017

        The following table shows information relating to the grants of certain equity and non-equity awards made to the NEOs during 2017.

36

---

Table of Contents

Outstanding Equity Awards at December 31, 2017

        The following table shows information relating to the equity awards previously granted to our NEOs that were outstanding as of December 31, 2017. Our NEOs did not hold any stock options as of December 31, 2017.

37

---

Table of Contents

Option Exercises and Stock Vested for the Year Ended December 31, 2017

        The following table shows information relating to the value realized by our NEOs as a result of the vesting of their restricted stock unit awards during 2017. Our NEOs did not exercise any stock options in 2017.

Pension Benefits

        Defined Benefit Pension Plan.    We sponsor a defined benefit pension plan covering all of our eligible employees, including our NEOs. We froze our pension plan on December 31, 2014. No participants earn any service credit after such date. Under the plan, a cash balance account was established for each participant. Participants become vested in their cash balance accounts after serving three years with us. Upon retirement or upon termination of employment following three years of service with us, participants or their beneficiaries may elect to receive benefits in a lump sum, in installments over a period of time or at a later date. Under the terms of the plan, normal retirement occurs on the first day of the month following the date a participant turns 65. We credit each participant's cash balance account with an interest amount based on the U.S. Treasury rate, subject to an annual minimum rate of 4.25%.

        Supplemental Retirement Plan.    We sponsor a supplemental retirement plan covering all of our eligible employees, including our NEOs, whose retirement benefits under our defined benefit pension plan are limited by the Code. We froze our supplemental retirement plan on December 31, 2014. Subject to the limitations contained in the Code, benefits under the supplemental retirement plan will be paid six months after termination in a lump sum.

38

---

Table of Contents

        The following table shows information relating to the accumulated benefits to which the NEOs were entitled under our defined benefit pension plans as of December 31, 2017:

Non-Qualified Deferred Compensation

        We maintain a deferred compensation plan that historically has allowed eligible employees to defer receipt of their base salaries and/or incentive awards until the dates elected by the employees. We have not allowed deferrals under the plan since the Company's emergence from Chapter 11, and our Board does not intend to allow deferrals in the future. The cash amounts previously deferred are invested in accounts that mirror the gains and/or losses of a number of different investment funds. These investment funds are substantially similar to the investment alternatives offered to participants in our 401(k) plan. The plan has never offered any above-market rates of return to any of our NEOs. Participants are always vested in their deferrals under the plan and any related earnings.

        Under the plan, we credit each participant's account with the number of units equal to the number of shares or units that the participant could purchase or receive with the amount of compensation deferred under the plan on the date we credit the participant's account, based upon the fair market value of the underlying investment on that date. We will pay the amount of compensation deferred under the plan to the participant (or to their designated beneficiary in the event of death) in annual installments or in a lump sum, at the participant's election, following the participant's termination of employment or on the date or dates specified by the participant in his payment election. The amount we pay will be based on the number of units credited to each participant's account, valued on the basis of the fair market value of an equivalent number of shares or units of the underlying investment on the date payment occurs. We may also pay a participant the amount of

39

---

Table of Contents

compensation deferred under the plan prior to the date the participant initially elected to receive payment if we determine that the employee has a demonstrated financial hardship.

        The following table shows information relating to the activity in the deferred compensation plan accounts for the NEOs during 2017:

Potential Payments Upon Termination of Employment or Change in Control

        We maintain certain agreements or arrangements with each of our NEOs and other executives that provide for the payment or acceleration of certain benefits in the event that the executive's employment is terminated without cause or following a change in control. In addition to the benefits described below, the NEOs would also be entitled to receive certain benefits under our defined benefit and pension plan, supplemental retirement plan and non-qualified deferred compensation plan. See the sub-section entitled "Pension Benefits" for more information on the benefits accumulated under our defined benefit pension plan and our supplemental retirement plan that are attributable to each of the NEOs and the sub-section entitled "Non-Qualified Deferred Compensation" for more information on the aggregate balance maintained under our deferred compensation plan by each of the NEOs.

        Our NEOs' change in control agreements provide "double trigger" payments on involuntary termination of employment in connection with a change in control. In connection with the Chapter 11 case in 2016, the NEOs agreed to waive the first trigger under the agreements, such that our Chapter 11 reorganization did not constitute a change in control for purposes of the agreements. As a result, our NEOs will only receive these "double trigger" payments if their employment is involuntarily terminated in connection with a subsequent change in control.

Potential Payments Upon Termination of Employment

        We maintain change in control agreements with our NEOs and other executives. Under the change in control agreements, we may be required to provide compensation in the event of a termination of employment or a change in control of the Company. As a condition to each executive's entitlement to receive payments under the change in control agreements, the executive is required to execute a waiver of claims against us and to abide by certain non-disclosure, non-competition and non-solicitation requirements.

40

---

Table of Contents

        Voluntary termination and termination for cause —  Each of the NEOs may terminate his employment at any time. In addition, we may terminate the employment of the NEOs for cause for any of the following reasons:

•

a willful and continual failure to perform his duties;



•

gross misconduct that is materially and demonstrably detrimental to us; or



•

the commission of a felony.

        Under the terms of the change in control agreements, if we terminate an executive's employment for cause or if an executive voluntarily terminates his employment, then we will pay the executive an amount equal to the executive's accrued and unpaid base salary.

        The RSU award agreements provide that, if an executive voluntarily terminates his employment (other than for good reason or due to retirement), his unvested RSUs will be forfeited. If we terminate an executive's employment for cause, his RSUs, whether vested or unvested, will be forfeited.

        Involuntary termination prior to a change in control —  Under the change in control agreements, each of the NEOs may be entitled to certain benefits on an involuntary termination. If we terminate an executive without cause prior to a change in control, then under the terms of the change in control agreement we will pay the executive a lump sum cash amount equal to the following:

•

one times (two times for Mr. Eaves) the executive's highest annual base salary during the preceding three years;



•

one times the higher of the executive's annual cash incentive award for the most recent year or the average annual cash incentive award for the three preceding years;



•

a pro-rata portion of any amounts to which the executive would be entitled under our annual cash incentive awards or our long-term cash and equity-based incentive awards;



•

12 times (18 times for Mr. Eaves) the effective monthly COBRA rate;



•

12 times (24 times for Mr. Eaves) the applicable monthly life insurance premium rate;



•

the matching contribution under our defined contribution plan and executive deferred compensation plan and the annual interest credit amounts under our defined benefit plans as if the executive continued to participate in those plans for a period of 12 months (24 months for Mr. Eaves);



•

the value of any unused vacation time.

        Also, we have agreed to reimburse the NEOs for the cost of financial counseling services (up to a maximum of $5,000) for a period of 12 months (24 months for Mr. Eaves), and the cost of reasonable outplacement services for a period of 12 months (24 months for Mr. Eaves).

        The RSU award agreements provide for the following treatment of the awards if an NEO's employment is terminated by us without cause or by the NEO for good reason:

•

For the time-based RSU awards granted in 2016, the one-third portion of the RSU that was scheduled to vest on the next annual vesting date will vest as of the date of such termination, and any remaining

41

---

Table of Contents

unvested portions will be forfeited. The vested portion of the award will be settled in shares on the third anniversary of the grant date or, if earlier, the first anniversary of such termination.

•

For the time-based RSU awards granted in 2017, a pro-rated portion of the RSU will vest (based on the portion of the three-year vesting period that the NEO was employed) as of the date of such termination, and any remaining unvested portions will be forfeited. The vested portion of the award will be settled in shares on the date of such termination.



•

For the performance-based RSU award, the service condition will be deemed attained with respect to a prorated portion of the RSUs (based on the portion of the three-year performance period that the NEO was employed), and such prorated portion of the award will remain subject to the VWAP performance condition. The remaining portion of the award will be forfeited.

        The following table shows the amounts that each of the NEOs would have received if we had terminated his employment for reasons other than cause prior to a change in control on December 31, 2017:

        Termination in connection with a change in control —  Under the change in control agreements, each of the NEOs may be entitled to certain benefits if we terminate the executive's employment for reasons other than cause following a change in control or if the executive terminates his employment for "good reason" (as defined in the executive's change in control agreement) during the two years following a change in control.

        The change in control agreements define a "change in control" to mean any of the following:

•

a consolidation, merger or similar transaction in which we do not survive or in which shares of our common stock are converted into cash, securities or other property, other than a merger in which the

42

---

Table of Contents

holders of our common stock immediately prior to the merger maintain substantially the same proportionate ownership of the common stock of the surviving entity immediately after the merger;

•

the sale, lease, exchange or other transfer of all or substantially all of our assets;



•

the approval by our stockholders of a plan of liquidation or dissolution; or



•

the failure of our directors to constitute a majority of our Board at any time during any two consecutive years.

        If we terminate an NEO for reasons other than cause following a change in control or if the NEO terminates his employment for good reason during the two years following a change in control, then under the terms of the change in control agreement, we will pay the executive a lump sum cash amount equal to the following:

•

two times (three times for Mr. Eaves) the executive's highest annual base salary during the preceding three years;



•

two times (three times for Mr. Eaves) the higher of the executive's annual cash incentive award for the most recent year or the average annual cash incentive award for the three years preceding the date of termination;



•

the full amount of any long-term cash and equity-based awards and a pro-rata portion of any amounts to which the executive would be entitled under our annual cash incentive awards;



•

18 times the effective monthly COBRA rate;



•

24 times (36 times for Mr. Eaves) the applicable monthly life insurance premium rate;



•

the matching contribution under our defined contribution plan and non-qualified executive deferred compensation plan and the annual interest credit amounts under our defined benefit plans as if the executive continued to participate in those plans for a period of 24 months (36 months for Mr. Eaves); and



•

the value of any unused vacation time.

        Also, we have agreed to reimburse each NEO for the cost of financial counseling services (up to a maximum of $5,000) for a period of 24 months (36 months for Mr. Eaves), and the cost of reasonable outplacement services for a period of 24 months (36 months for Mr. Eaves).

        The RSU award agreements provide for accelerated vesting immediately on a change in control (see below under "Potential Payments Upon Change in Control"). As a result, the NEOs would not receive any additional benefits with respect to their RSUs on termination of employment following a change in control.

43

---

Table of Contents

        The following table shows the amounts each NEO would have received if we had terminated his employment on December 31, 2017 for reasons other than cause following a change in control or if the NEO had terminated his employment on December 31, 2017 following a change in control:

        Death or disability —  The change in control agreements provide that, in the event an NEO's employment is terminated as a result of his death or disability, then we will pay the executive an amount equal to the executive's accrued and unpaid base salary, unused vacation time and all other amounts, including payouts under our annual cash incentive awards, that the executive has earned but which have not yet been paid. Any performance units held by the executive will vest based on the portion of the vesting period that preceded such termination, subject to attainment of the applicable performance goals.

        The RSU award agreements provide for the following treatment of the awards if an NEO's employment is terminated as a result of his death or disability:

•

For the time-based RSU award, the RSUs will vest in full and be settled in shares as of the date of such termination.



•

For the performance-based RSU award, the service condition will be deemed attained with respect to 100% of the RSUs and the award will remain subject to the VWAP performance condition.

44

---

Table of Contents

        The following table shows the amounts each NEO would have received if his employment had terminated on December 31, 2017 as a result of his death or disability:

        Retirement —  The change in control agreements provide that, in the event an NEO's employment is terminated as a result of his retirement, then we will pay the executive an amount equal to the executive's accrued and unpaid base salary, unused vacation time and all other amounts, including payouts under our annual cash incentive awards, that the executive has earned but which have not yet been paid. Any performance units held by the executive will vest based on the portion of the vesting period that preceded such termination, subject to attainment of the applicable performance goals.

        The RSU award agreements provide for the following treatment of the awards if an NEO's employment is terminated as a result of his retirement:

•

For the time-based RSU awards, a pro-rated portion of the RSU will vest (based on the portion of the three-year vesting period that the NEO was employed) as of the date of such termination, and any remaining unvested portions will be forfeited.



•

For the performance-based RSU award, the service condition will be deemed attained with respect to a prorated portion of the RSUs (based on the portion of the three-year performance period that the NEO was employed), and such prorated portion of the award will remain subject to the VWAP performance condition. The remaining portion of the award will be forfeited.

45

---

Table of Contents

        The following table shows the amounts each NEO would have received if his employment had terminated on December 31, 2017 as a result of his retirement:

Potential Payments Upon Change in Control

        The RSU award agreements provide for the following treatment of the awards on a change in control:

•

For the time-based RSU award, the award will fully vest.



•

For the performance-based RSU award, the service condition will be deemed attained with respect to 100% of the RSUs. The level of attainment of the VWAP performance condition will be determined based on the greater of (i) the price or implied price per share of our common stock in such change in control or (ii) the highest VWAP for any period of 90 trading days or 45 trading days, depending on the RSU award, during the portion of the three-year performance period ending on the day prior to such change in control. To the extent that the award vests, the award will be settled as of the date of such change in control.

        Under the terms of the Arch Coal, Inc. 2016 Omnibus Incentive Plan, a change in control means any of the following:

•

the acquisition by any person of more than 50% of our outstanding common stock;



•

a consolidation or merger in which we do not survive or in which shares of our common stock are converted to cash, securities or other property, other than a merger in which the holders of our common stock immediately prior to the merger maintain more than 50% of the ownership of common stock of the surviving corporation immediately after the merger;

46

---

Table of Contents

•

the sale, lease, exchange or other transfer of all or substantially all of our assets;



•

our stockholders approve a plan or proposal for our liquidation or dissolution; or



•

during a period of two consecutive years, continuing directors cease to constitute a majority of the Board.

        The following table shows the amounts each NEO would have received if we had undergone a change in control on December 31, 2017:

Pay Ratio Disclosure

        As required by Section 953(b) of the Dodd-Frank Wall Street Reform and Consumer Protection Act, and Item 402(u) of Regulation S-K, we are providing the following information regarding the relationship of the annual total compensation of our employees and the annual total compensation of our CEO. We consider the pay ratio specified below to be a reasonable estimate, calculated in a manner intended to be consistent with Item 402(u) of Regulation S-K.

        We identified the median employee by examining all W-2 reported earnings, excluding our CEO, for those who were employed by us on October 1, 2017. We included all employees, whether employed on a full-time or part-time basis, and annualized the earnings for any employee who was hired after January 1, 2017 or had a break in employment between January 1, 2017 and October 1, 2017.

        After identifying the median employee based on W-2 reported earnings through September 30, 2017, we calculated the annual total compensation for 2017 for such employee using the same methodology we used for our NEOs as set forth in the 2017 Summary Compensation Table earlier in this section.

        For 2017, the value of the annual total compensation of the median employee was $96,992. For 2017, the annual total compensation of our CEO was $9,790,214. The resulting pay ratio of the annual total compensation of our CEO to the median of the annual total compensation of all of our employees (other than our CEO) for 2017 was 101:1.

47

---

Table of Contents

DIRECTOR COMPENSATION

        Our director compensation program is designed to compensate our non-employee directors for the amount of work required for a company of our size and scope and to align the interests of our non-employee directors with the long-term interests of our stockholders and other stakeholders.

        The Committee annually reviews the compensation structure and amounts for our non-employee directors. From time to time, the Committee may engage a compensation consultant to provide survey or proxy data on the structure and amount of director compensation for other companies. During 2016, the Committee retained LB to assist the Committee in determining the compensation structure for our non-employee directors following our emergence from Chapter 11, which structure took into account our need to attract members to our Board following emergence from Chapter 11. The Committee believes the amount of compensation provided is reasonable for the amount of work required by our non-employee directors and the elements of this program align the interests of our non-employee directors with the long-term interests of our stockholders.

        Compensation of Our Board.    Our Board adopted the following compensation structure for our non-employee directors for 2017:

Annual Board Retainers

48

---

Table of Contents

        The following table sets forth compensation paid to each director (other than Mr. Eaves) in 2017 who served on the Board in 2017.

        Stock Ownership Guidelines.    In order to align the interests of our non-employee directors with the long-term interests of our stockholders, the Board has adopted stock ownership guidelines for non-employee directors. Each newly elected non-employee director is expected to satisfy this goal within five years of becoming a director.

        Under the guidelines, each non-employee director (other than Mr. Bartels, who, due to his affiliation with Monarch, has elected not to receive equity awards) is required to own a number of shares of our common stock equal in value to three times the value of the annual retainer. Each non-employee director's ownership is reviewed annually, with each share of common stock held by a non-employee director being valued at the Company's average closing price for the 90 days prior to the measurement date. In the event that a non-employee director does not meet the applicable guideline at any time after the initial five-year period, the director is required to hold a minimum of 67% of the net shares resulting from any future vesting of restricted stock or restricted stock units until the guideline is met.

49

---

Table of Contents

PERSONNEL AND COMPENSATION COMMITTEE REPORT

        The Personnel and Compensation Committee is comprised entirely of independent directors and has the responsibility for reviewing and recommending changes in our executive compensation policies and programs to the Board of Directors. The Committee also reviews and makes recommendations for all compensation payments to our chief executive officer and other executives, which are approved by the Board of Directors as a whole.

        The Personnel and Compensation Committee has reviewed and met with management to discuss the disclosures contained in the section of this proxy statement entitled "Executive Compensation — Compensation Discussion and Analysis." Based on that review and discussions with management, the Personnel and Compensation Committee recommended to the Board of Directors, and the Board of Directors approved, including the disclosures contained in the section entitled "Compensation Discussion and Analysis" in this proxy statement and, by incorporating that section by reference, in the Annual Report on Form 10-K for the year ended December 31, 2017 for filing with the SEC.

PERSONNEL AND COMPENSATION COMMITTEE

James N. Chapman, Chairman
Patrick J. Bartels, Jr.
Scott D. Vogel

        The material contained in this Personnel and Compensation Committee Report does not constitute soliciting material, is not deemed filed with the SEC, and is not incorporated by reference into any other Company filing under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, whether made on, before, or after the date of this Proxy Statement and irrespective of any general incorporation language in such filing, except to the extent that the Company specifically incorporates the Personnel and Compensation Committee Report by reference therein.

50

---

Table of Contents

AUDIT COMMITTEE REPORT

        The Audit Committee oversees the Company's financial reporting process on behalf of the Board of Directors as set forth in its charter. Management is primarily responsible for the financial statements and reporting process, including the systems of internal controls, while the independent registered public accounting firm is responsible for performing an independent audit of the Company's financial statements in accordance with auditing standards generally accepted in the United States and expressing an opinion on the conformity of those financial statements with accounting principles generally accepted in the United States.

        In this context, the Audit Committee has reviewed the Company's audited consolidated financial statements and has met with and held discussions with management, the Company's internal auditors and with Ernst & Young LLP, the Company's independent registered public accounting firm, to discuss those financial statements and related matters. The Audit Committee reviewed with the Company's internal and independent auditors the overall scope and plans for their respective audits. The Audit Committee also met, at least quarterly, with the auditors, with and without management present, to discuss the results of their examinations, their evaluations of the Company's internal controls and the overall quality of the Company's financial reporting. The Audit Committee also reviewed with the independent auditors their judgment as to the quality and the appropriateness of the Company's accounting principles and financial controls and such other matters as are required to be discussed with the Audit Committee under auditing standards generally accepted in the United States.

        The Company's independent registered public accounting firm also provided to the Audit Committee the written disclosures and the letter prescribed by applicable requirements of the Public Company Accounting Oversight Board regarding the independent registered public accounting firm's communications with the Audit Committee concerning independence, and the Audit Committee discussed with the independent auditors that firm's independence, including those matters required to be discussed by Auditing Standard No. 1301, Communications with Audit Committees as adopted by the Public Company Accounting Oversight Board. The Audit Committee considered whether the performance by Ernst & Young LLP of non-audit services was compatible with their independence.

        In reliance on the reviews and discussions referred to above, the Audit Committee recommended to the Board of Directors, and the Board of Directors approved, including the audited consolidated financial statements in the Annual Report on Form 10-K for the year ended December 31, 2017 for filing with the Securities and Exchange Commission. The Audit Committee has retained Ernst & Young LLP as the Company's independent registered public accounting firm for 2018.

        While the Audit Committee has the responsibilities and powers set forth in its charter, it is not the duty of the Audit Committee to plan or conduct audits or to determine that the Company's financial statements are complete and accurate or are in accordance with generally accepted accounting principles. This is the responsibility of management and the independent auditor.

AUDIT COMMITTEE

Patrick A. Kriegshauser, Chairman
Sherman K. Edmiston III
Richard A. Navarre

51

---

Table of Contents

        The material contained in this Audit Committee Report does not constitute soliciting material, is not deemed filed with the SEC, and is not incorporated by reference into any other Company filing under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, whether made on, before, or after the date of this Proxy Statement and irrespective of any general incorporation language in such filing, except to the extent that the Company specifically incorporates the Audit Committee Report by reference therein.

52

---

Table of Contents

EQUITY COMPENSATION PLAN INFORMATION

        The following table provides information, as of December 31, 2017, regarding the number of shares of common stock that may be issued under the Company's equity compensation plans.

53

---

Table of Contents

SECURITY OWNERSHIP OF DIRECTORS AND EXECUTIVE OFFICERS

        The following table sets forth, as of March 6, 2018, information concerning the beneficial ownership of our common stock by each director, each of the executives named in this proxy statement and all current directors and executive officers as a group. Under rules of the SEC, persons who have power to vote or dispose of securities, either alone or jointly with others, are deemed to be the beneficial owners of such securities. Each person reflected in the table below has both sole voting and investment power with respect to the shares included in the table, except as described in the footnotes below:

54

---

Table of Contents

SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS

        The following table shows all persons or entities that we know were "beneficial owners" of more than five percent of our common stock on March 6, 2018.

55

---

Table of Contents

SECTION 16(a) BENEFICIAL OWNERSHIP REPORTING COMPLIANCE

        Section 16(a) of the Securities Exchange Act of 1934 requires the Company's directors, executive officers and any persons beneficially holding more than ten percent of the Company's common stock to report their ownership of common stock and any changes in that ownership to the Securities and Exchange Commission and the New York Stock Exchange. The Securities and Exchange Commission has established specific due dates for these reports, and the Company is required to report in this proxy statement any failure to file by these dates. Based solely on a review of the copies of the reports furnished to the Company and written representations that no other such statements were required, the Company believes that all such reports of the Company's directors and executive officers were filed on a timely basis.

56

---

Table of Contents

CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

Review and Approval of Transactions with Related Persons

        In determining whether to approve, ratify or disapprove of the Company's entry into a transaction with a related party, our Board considers all relevant facts and circumstances and takes into account, among other factors:

•

whether the transaction is on terms no less favorable than terms generally available to an unaffiliated third party under the same or similar circumstances;



•

whether the transaction would impair the independence of an outside director; and



•

whether the transaction would present an improper conflict of interest for any director or executive officer of the Company.


Transactions with Related Persons


Registration Rights Agreement

        On November 17, 2016, the Company entered into a registration rights agreement (the "Registration Rights Agreement") with Monarch Alternative Capital LP and certain other affiliated funds (collectively, "Monarch"). The Company determined to enter into the Registration Rights Agreement because Monarch is an "affiliate" of the Company as defined under the securities laws, holding 13.23% of the Company's Class A Common Stock. Pursuant to the Company's Chapter 11 Plan of Reorganization, upon the Company's emergence from bankruptcy on October 5, 2016, Patrick J. Bartels Jr., a managing principal of Monarch Alternative Capital LP, was appointed to the Company's Board and is a member of the Company's Personnel and Compensation Committee and the Company's Nominating and Corporate Governance Committee. Additionally, the Company entered into an observer rights agreement with Monarch upon the Company's emergence from bankruptcy, pursuant to which Monarch appointed an observer to attend meetings of the Company's Board and meetings of committees of the Company's Board.

        Pursuant to the Registration Rights Agreement, the Company has agreed that upon Monarch's request it will file a registration statement to permit Monarch to sell shares of the Company's Class A Common Stock. Demands for registration by Monarch are subject to (i) a minimum aggregate proceeds size of $35 million, (ii) a limit of one demand per any six-month period and (iii) a limit of three demands in the aggregate. If the Company is eligible to use Form S-3, Monarch has the right to request that the Company file a shelf registration statement. Monarch's right to sell shares pursuant to the shelf registration statement is subject to the same limitations described above for demand registration rights. If the Company undertakes a registered public offering (subject to customary exceptions), the Company must notify Monarch and offer it the opportunity to participate in such offering, subject to customary cutback rights. Monarch's registration rights are subject to customary blackout restrictions. The Registration Rights Agreement also provides restrictions on Monarch's ability to transfer ownership of its Class A Common Stock to competitors, with certain exceptions, set forth in the Registration Rights Agreement.

        The Company has agreed to pay customary expenses associated with any registration under the Registration Rights Agreement, but excluding underwriting discounts and commissions.

57

---

Table of Contents

        The Registration Rights Agreement terminates in the event (i) Monarch provides written notification of termination to the Company, (ii) Monarch's shares of Class A Common Stock subject to the Registration Rights Agreement have been sold and are freely tradeable, or (iii) Monarch owns less than 5% of the outstanding Class A Common Stock.

Repurchases of Class A Common Stock

        During 2017, the Company repurchased an aggregate of 1,250,000 shares of its Class A Common Stock directly from Monarch as part of its share repurchase program. On September 19, 2017, the Company repurchased 750,000 shares of its Class A Common Stock at a price per share of $74.33 for a total purchase price of approximately $55.7 million. On December 14, 2017, the Company repurchased 500,000 shares of its Class A Common Stock at a price per share of $83.03 for a total purchase price of approximately $41.5 million. The purchase price for each share repurchase was calculated based on a discount to the closing price of the Company's Class A Common Stock on the date of the related stock repurchase agreement. Each repurchase was paid for with cash on hand.

58

---

Table of Contents

STOCKHOLDER PROPOSALS FOR THE 2019 ANNUAL MEETING

        If you wish to submit proposals for possible inclusion in the Company's 2019 proxy materials, the Company must receive them at its principal executive offices no later than the close of business on November 19, 2018. Proposals should be addressed to Robert G. Jones, Senior Vice President — Law, General Counsel and Secretary, Arch Coal, Inc., One CityPlace Drive, Suite 300, St. Louis, Missouri 63141. If you wish to include a nominee for director in the Company's 2019 proxy statement pursuant to the proxy access provisions of the Company's Bylaws, and you meet the qualifications set forth in the Company's Bylaws, your notice must be delivered not earlier than December 31, 2018 and not later than January 30, 2019. If you wish to nominate directors and/or propose proper business from the floor for consideration at the 2019 annual meeting of stockholders, the Company's Bylaws provide that:

•

you must notify the Company's secretary in writing;



•

your notice must have been received at the Company's headquarters not earlier than December 31, 2018 and not later than January 30, 2019; and



•

your notice must contain the specific information required in the Company's Bylaws.

        The Company will send copies of these requirements to any stockholder who writes to the Company requesting this information. Please note that these three requirements apply only to matters that you wish to bring before your fellow stockholders at the 2019 annual meeting of stockholders without submitting them for possible inclusion in the Company's 2019 proxy materials.

59

---

Table of Contents

INTERNET AVAILABILITY OF PROXY MATERIALS
Important Notice Regarding the Availability of Proxy Materials
for the Stockholder Meeting To Be Held on April 30, 2018

        The notice of Annual Meeting, proxy statement and the Company's 2017 annual report may be viewed online under the "Investors" section located on the Company's website at archcoal.com. Information on the Company's website does not constitute part of this proxy statement. You may find more information about the date, time and location of the Annual Meeting, as well as the items to be voted on by stockholders at the Annual Meeting, in the section of this proxy statement entitled "Proxy Summary." There, you will also find information about attending the Annual Meeting and voting your proxy, including where you may find the individual control numbers necessary to vote your shares by telephone or over the Internet.

        If you are a stockholder of record and are interested in receiving future proxy statements and annual reports electronically, you should contact the Company's transfer agent by accessing your account at amstock.com and selecting "Shareholder Account Access." If you hold shares of the Company's common stock through a broker, bank or other nominee, please refer to the instructions provided by that entity for instructions on how to elect this option.

PROXY SOLICITATION

        The Company is paying the cost of preparing, printing, and mailing these proxy materials. The Company will reimburse brokerage firms, banks and others for their reasonable expenses in forwarding proxy materials to beneficial owners and obtaining their instructions.

        Proxies will be solicited by mail and also may be solicited by the Company's executive officers and other employees personally, by telephone or by electronic means, but such persons will not be specifically compensated for such services. The Company will also pay fees of approximately $12,500 to D.F. King & Co., Inc. to assist in soliciting proxies on behalf of the Company. It is contemplated that brokerage firms, banks, custodians, fiduciaries and other nominees will be requested to forward the soliciting material to the beneficial owners of stock held of record by such persons, and the Company will reimburse them for their reasonable expenses incurred.

March 19, 2018

60

---