<SEC-DOCUMENT>0001515156-25-000131.txt : 20251006
<SEC-HEADER>0001515156-25-000131.hdr.sgml : 20251006
<ACCEPTANCE-DATETIME>20251006173720
ACCESSION NUMBER:		0001515156-25-000131
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250925
FILED AS OF DATE:		20251006
DATE AS OF CHANGE:		20251006

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			McIntyre Julian Alexander
		CENTRAL INDEX KEY:			0001963363
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-37822
		FILM NUMBER:		251377780

	MAIL ADDRESS:	
		ADDRESS IS A NON US LOCATION: 	YES
		STREET 1:		30A BROOK STREET
		CITY:			LONDON
		PROVINCE COUNTRY:   	X0
		ZIP:			W1K5DJ

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Arq, Inc.
		CENTRAL INDEX KEY:			0001515156
		STANDARD INDUSTRIAL CLASSIFICATION:	MISCELLANEOUS CHEMICAL PRODUCTS [2890]
		ORGANIZATION NAME:           	08 Industrial Applications and Services
		EIN:				275472457
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		8051 E. MAPLEWOOD AVE., STE 210
		CITY:			GREENWOOD VILLAGE
		STATE:			CO
		ZIP:			80111
		BUSINESS PHONE:		720-598-3500

	MAIL ADDRESS:	
		STREET 1:		8051 E. MAPLEWOOD AVE., STE 210
		CITY:			GREENWOOD VILLAGE
		STATE:			CO
		ZIP:			80111

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Advanced Emissions Solutions, Inc.
		DATE OF NAME CHANGE:	20110311
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wk-form4_1759786637.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-09-25</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001515156</issuerCik>
        <issuerName>Arq, Inc.</issuerName>
        <issuerTradingSymbol>ARQ</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001963363</rptOwnerCik>
            <rptOwnerName>McIntyre Julian Alexander</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O ARQ, INC.</rptOwnerStreet1>
            <rptOwnerStreet2>8051 E. MAPLEWOOD AVENUE, SUITE 210</rptOwnerStreet2>
            <rptOwnerCity>GREENWOOD VILLAGE</rptOwnerCity>
            <rptOwnerState>CO</rptOwnerState>
            <rptOwnerZipCode>80111</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2025-09-25</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>30000</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3191289</value>
                    <footnoteId id="F2"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Allard Services Limited</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>58978</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of common stock of the Issuer held by MWB Limited which were transferred to a minority owner of MWB Limited on September 25, 2025 in anticipation of the intended dissolution of the MWB Limited entity. Allard Services Limited is the majority owner of MWB Limited. Concurrently, the remaining 352,042 shares of the Issuer's common stock held by MWB Limited were transferred to Allard Services Limited and are included in the total securities beneficially owned by Allard Services Limited reported in this row.</footnote>
        <footnote id="F2">The reported amount includes 352,042 shares, 43,034 shares and 21,908 shares of common stock that were transferred to Allard Services Limited from MWB Limited, Markham Fuels Management Limited and Stannard Limited, respectively, since the date of the last report filed by the reporting person. As of the date of this report, MWB Limited, Markham Fuels Management Limited and Stannard Limited no longer hold shares of the Issuer's common stock.</footnote>
        <footnote id="F3">The shares reported on this row are held by Allard Services Limited.  Julian McIntyre, a Director of the Issuer, controls Allard Services Limited and therefore is an indirect beneficial owner of the securities reported herein.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Julian Alexander McIntyre</signatureName>
        <signatureDate>2025-10-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
