<SEC-DOCUMENT>0001699136-21-000087.txt : 20210316
<SEC-HEADER>0001699136-21-000087.hdr.sgml : 20210316
<ACCEPTANCE-DATETIME>20210316161049
ACCESSION NUMBER:		0001699136-21-000087
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210312
FILED AS OF DATE:		20210316
DATE AS OF CHANGE:		20210316

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			ODONNELL JOHN A
		CENTRAL INDEX KEY:			0001173592

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38390
		FILM NUMBER:		21745796

	MAIL ADDRESS:	
		STREET 1:		2929 ALLEN PARKWAY
		STREET 2:		SUITE 2100
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77019

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Cactus, Inc.
		CENTRAL INDEX KEY:			0001699136
		STANDARD INDUSTRIAL CLASSIFICATION:	OIL & GAS FILED MACHINERY & EQUIPMENT [3533]
		IRS NUMBER:				352586106
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		920 MEMORIAL CITY WAY
		STREET 2:		SUITE 300
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77024
		BUSINESS PHONE:		713-626-8800

	MAIL ADDRESS:	
		STREET 1:		920 MEMORIAL CITY WAY
		STREET 2:		SUITE 300
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77024
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_161592541818607.xml
<DESCRIPTION>FORM 4
<TEXT>
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    <periodOfReport>2021-03-12</periodOfReport>

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    <issuer>
        <issuerCik>0001699136</issuerCik>
        <issuerName>Cactus, Inc.</issuerName>
        <issuerTradingSymbol>WHD</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001173592</rptOwnerCik>
            <rptOwnerName>ODONNELL JOHN A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>920 MEMORIAL CITY WAY</rptOwnerStreet1>
            <rptOwnerStreet2>SUITE 300</rptOwnerStreet2>
            <rptOwnerCity>HOUSTON</rptOwnerCity>
            <rptOwnerState>TX</rptOwnerState>
            <rptOwnerZipCode>77024</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
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            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class B Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2021-03-12</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>D</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                <sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
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            <transactionDate>
                <value>2021-03-12</value>
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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
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            <transactionDate>
                <value>2021-03-12</value>
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                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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                <transactionShares>
                    <value>25000</value>
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                <transactionPricePerShare>
                    <value>30.555</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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                <sharesOwnedFollowingTransaction>
                    <value>15260</value>
                </sharesOwnedFollowingTransaction>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Units</value>
                <footnoteId id="F3"/>
            </securityTitle>
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                <footnoteId id="F4"/>
                <footnoteId id="F5"/>
                <footnoteId id="F6"/>
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                <transactionPricePerShare>
                    <footnoteId id="F7"/>
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                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F4"/>
                <footnoteId id="F5"/>
                <footnoteId id="F6"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F4"/>
                <footnoteId id="F5"/>
                <footnoteId id="F6"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>25000.0</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>27508</value>
                </sharesOwnedFollowingTransaction>
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            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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    <footnotes>
        <footnote id="F1">These securities were disposed of in connection with the closing of the Issuer's most recent secondary public offering on March 12, 2021 (the &quot;Offering&quot;). In connection with the redemption of Units, as described below, the Reporting Person disposed of a corresponding number of shares of Class B Common Stock, which shares were cancelled by the Issuer.</footnote>
        <footnote id="F2">These securities were acquired in connection with certain transactions associated with the closing of the Issuer's most recent secondary public offering.</footnote>
        <footnote id="F3">&quot;Units&quot; mean ownership interests in Cactus Wellhead, LLC (&quot;Cactus LLC&quot;). The Issuer is the sole managing member of Cactus LLC.</footnote>
        <footnote id="F4">The first amended and restated limited liability company operating agreement of Cactus LLC provides the holders of Units with certain rights to cause Cactus LLC to acquire all or at least a minimum portion of their Units for, at Cactus LLC's election, (x) shares of Class A Common Stock at a redemption ratio of one share of Class A Common Stock for each Unit redeemed, subject to conversion rate adjustments for stock splits, stock dividends and reclassification and other similar transactions, or (y) an equivalent amount of cash (the &quot;Redemption Right&quot;).</footnote>
        <footnote id="F5">(Continued from footnote 4) Alternatively, upon the exercise of the Redemption Right, the Issuer (instead of Cactus LLC) will have the right to acquire each tendered Unit directly from the exchanging Unit holder for, at its election, (x) shares of Class A Common Stock at a redemption ratio of one share of Class A Common Stock for each Unit redeemed, subject to conversion rate adjustments for stock splits, stock dividends and reclassification and other similar transactions, or (y) an equivalent amount of cash.</footnote>
        <footnote id="F6">Upon the exercise of the Redemption Right, the Issuer (instead of Cactus LLC) has the right (the &quot;Call Right&quot;) to acquire each tendered Unit directly from the exchanging Unit holder for, at its election, (x) shares of Class A Common Stock at a redemption ratio of one share of Class A Common Stock for each Unit redeemed, subject to conversion rate adjustments for stock splits, stock dividends and reclassification and other similar transactions, or (y) an equivalent amount of cash. In connection with the Offering, the Issuer exercised its Call Right and acquired the tendered Units (and a corresponding number of shares of Class B Common Stock) in return for shares of Class A Common Stock.</footnote>
        <footnote id="F7">The Units were redeemed for Class A Common Stock on March 12, 2021 in connection with the Offering.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ John A O'Donnell, by David Isaac as Attorney-in-Fact</signatureName>
        <signatureDate>2021-03-16</signatureDate>
    </ownerSignature>
</ownershipDocument>
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</SEC-DOCUMENT>
