FORM 10-K ☐ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGEACT OF 1934For the fiscal year ended December 31, 2024or☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIESEXCHANGE ACT OF 1934For the transition period from to (Exact name of registrant as specified in its charter) 81-0706839 (State or other jurisdiction of incorporation ororganization) (I.R.S. Employer Identification No.) 16243 Highway 216 35444 Alabama (Address of Principal Executive Offices) (Zip Code) (205) 554-6150(Registrant’s telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act: Trading Symbol(s)HCC Title of each classCommon Stock, par value $0.01 per shareRights to Purchase Series A JuniorParticipating Preferred Stock, par value$0.01 per share New York Stock Exchange Securities registered pursuant to Section 12(g) of the Act: None. Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.YesýNo o Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.YesoNo ý Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of theSecurities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to filesuch reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ýNo o Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to besubmitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorterperiod that the registrant was required to submit such files). Yes ýNo o Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or asmaller reporting company or an emerging growth company. See the definitions of“large accelerated filer,”“accelerated filer,”“smaller reporting company”and“emerging growth company”in Rule 12b-2 of the Exchange Act. Smaller reportingcompany Large accelerated filerýAccelerated fileroNon-accelerated filero☐Emerging growth company☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period forcomplying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of theeffectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C 7262(b)) bythe registered public accounting firm that prepared or issued its audit report.☐ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements ofthe registrant included in the filing reflect the correction of an error to previously issued financial statements. Yes☐No ý Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis ofincentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to§240.10D-1(b). Yes☐No ý Indicateby check mark whether the registrant is a shell company(as defined in Rule 12b-2 of the ExchangeAct). Yes☐No ýThe aggregate market value of voting stock held by non-affiliates of the registrant, based on the closing price of the common stock on June 30, 2024, the registrant’s most recently completed second fiscal quarter, as reported by the New York StockExchange, was approximately $3.3 billion. Number of shares of common stock outstanding as of February 12, 2025: 52,540,246 Documents Incorporated By Reference Portions of the registrant’s definitive proxy statement for its 2024 Annual Meeting of Stockholders, which will be filed with theSecurities and Exchange Commission within 120 days of December 31, 2024, are incorporated by reference into Part III of thisreport for the year ended December 31, 2024. Forward-Looking Statements Glossary of Selected Terms 3 Part IItem 1.Business6Item 1A.Risk Factors20Item 1B.Unresolved Staff Comments54Item 1C.Cybersecurity54Item 2.Properties56Item 3.Legal Proceedings67Item 4.Mine Safety Disclosures67Part IIItem 5.Market for Registrant’s Common Equity, Related Stockholder Matters and IssuerPurchases of Equity Securities.68Item 6.[Reserved]69Item 7.Management’s Discussion and Analysis of Financial Condition and Results ofOperations70Item 7A.Quantitative and Qualitative Disclosures About Market Risk89Item 8.Financial Statements and Supplementary Data89Item 9.Changes in and Disagreements with Accountants on Accounting and FinancialDisclosure90Item 9A.Controls and Procedures90Item 9B.Other Information90Item 9C.D