<SEC-DOCUMENT>0001127602-18-017384.txt : 20180514
<SEC-HEADER>0001127602-18-017384.hdr.sgml : 20180514
<ACCEPTANCE-DATETIME>20180514173038
ACCESSION NUMBER:		0001127602-18-017384
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20180510
FILED AS OF DATE:		20180514
DATE AS OF CHANGE:		20180514

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Williams Stephen D.
		CENTRAL INDEX KEY:			0001702386

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38061
		FILM NUMBER:		18832074

	MAIL ADDRESS:	
		STREET 1:		C/O WARRIOR MET COAL, LLC
		STREET 2:		16243 HIGHWAY 216
		CITY:			BROOK
		STATE:			AL
		ZIP:			35444

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			WARRIOR MET COAL, INC.
		CENTRAL INDEX KEY:			0001691303
		STANDARD INDUSTRIAL CLASSIFICATION:	BITUMINOUS COAL & LIGNITE MINING [1220]
		IRS NUMBER:				810706839
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		16243 HIGHWAY 216
		CITY:			BROOKWOOD
		STATE:			AL
		ZIP:			35444
		BUSINESS PHONE:		2055546150

	MAIL ADDRESS:	
		STREET 1:		16243 HIGHWAY 216
		CITY:			BROOKWOOD
		STATE:			AL
		ZIP:			35444

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	WARRIOR MET COAL, LLC
		DATE OF NAME CHANGE:	20161201
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form4.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-05-10</periodOfReport>

    <issuer>
        <issuerCik>0001691303</issuerCik>
        <issuerName>WARRIOR MET COAL, INC.</issuerName>
        <issuerTradingSymbol>HCC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001702386</rptOwnerCik>
            <rptOwnerName>Williams Stephen D.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>16243 HIGHWAY 216</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BROOKWOOD</rptOwnerCity>
            <rptOwnerState>AL</rptOwnerState>
            <rptOwnerZipCode>35444</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-05-10</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>6778</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>39370</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents the vesting of restricted stock upon the satisfaction of conditions outside of the reporting person's control.  The reporting person was granted (i) 14,526 shares of restricted stock on April 1, 2016 under the Warrior Met Coal, Inc. 2016 Equity Incentive Plan (the &quot;2016 Plan&quot;), 5,810 of which vested on May 10, 2018, and (ii) 4,844 shares of restricted stock on February 24, 2017 under the 2016 Plan, 968 of which vested on May 10, 2018.</footnote>
        <footnote id="F2">Includes (i) 8,716 shares of restricted stock granted to the reporting person on April 1, 2016 under the Warrior Met Coal, Inc. 2016 Equity Incentive Plan (the &quot;2016 Plan&quot;), which vest in equal installments on April 1, 2019, April 1, 2020 and April 1, 2021, and (ii) 3,876 shares of restricted stock granted to the reporting person on February 24, 2017 under the 2016 Plan, which vest in equal installments on February 24, 2019, February 24, 2020, February 24, 2021 and February 24, 2022.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Kelli K. Gant, by power of attorney</signatureName>
        <signatureDate>2018-05-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
