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<?xml version="1.0" encoding="windows-1252"?> |
<ownershipDocument> |
| <schemaVersion> X0306 </schemaVersion> |
| <documentType> 4 </documentType> |
| <periodOfReport> 2020-03-09 </periodOfReport> |
| <notSubjectToSection16> 0 </notSubjectToSection16> |
| <issuer> |
| | <issuerCik> 0001641991 </issuerCik> |
| | <issuerName> SPX FLOW, Inc. </issuerName> |
| | <issuerTradingSymbol> FLOW </issuerTradingSymbol> |
| | </issuer> |
| <reportingOwner> |
| | <reportingOwnerId> |
| | | <rptOwnerCik> 0001531882 </rptOwnerCik> |
| | | <rptOwnerName> Hyde Belinda </rptOwnerName> |
| | | </reportingOwnerId> |
| | <reportingOwnerAddress> |
| | | <rptOwnerStreet1> C/O SPX FLOW, INC. </rptOwnerStreet1> |
| | | <rptOwnerStreet2> 13320 BALLANTYNE CORPORATE PLACE </rptOwnerStreet2> |
| | | <rptOwnerCity> CHARLOTTE </rptOwnerCity> |
| | | <rptOwnerState> NC </rptOwnerState> |
| | | <rptOwnerZipCode> 28277 </rptOwnerZipCode> |
| | | <rptOwnerStateDescription></rptOwnerStateDescription> |
| | | </reportingOwnerAddress> |
| | <reportingOwnerRelationship> |
| | | <isDirector> 0 </isDirector> |
| | | <isOfficer> 1 </isOfficer> |
| | | <isTenPercentOwner> 0 </isTenPercentOwner> |
| | | <isOther> 0 </isOther> |
| | | <officerTitle> VP and CHRO </officerTitle> |
| | | <otherText></otherText> |
| | | </reportingOwnerRelationship> |
| | </reportingOwner> |
| <nonDerivativeTable> |
| | <nonDerivativeTransaction> |
| | | <securityTitle> |
| <value> Common Stock </value> |
| </securityTitle> |
| | | <transactionDate> |
| <value> 2020-03-09 </value> |
| </transactionDate> |
| | | <transactionCoding> |
| <transactionFormType> 4 </transactionFormType> |
| <transactionCode> F </transactionCode> |
| <equitySwapInvolved> 0 </equitySwapInvolved> |
| <footnoteId id="F1"/> |
| </transactionCoding> |
| | | <transactionAmounts> |
| <transactionShares> |
| <value> 782 </value> |
| </transactionShares> |
| <transactionPricePerShare> |
| <value> 34.41 </value> |
| </transactionPricePerShare> |
| <transactionAcquiredDisposedCode> |
| <value> D </value> |
| </transactionAcquiredDisposedCode> |
| </transactionAmounts> |
| | | <postTransactionAmounts> |
| <sharesOwnedFollowingTransaction> |
| <value> 36503 </value> |
| </sharesOwnedFollowingTransaction> |
| </postTransactionAmounts> |
| | | <ownershipNature> |
| <directOrIndirectOwnership> |
| <value> D </value> |
| </directOrIndirectOwnership> |
| </ownershipNature> |
| | | </nonDerivativeTransaction> |
| | <nonDerivativeHolding> |
| | | <securityTitle> |
| <value> Common Stock </value> |
| </securityTitle> |
| | | <postTransactionAmounts> |
| <sharesOwnedFollowingTransaction> |
| <value> 847 </value> |
| </sharesOwnedFollowingTransaction> |
| </postTransactionAmounts> |
| | | <ownershipNature> |
| <directOrIndirectOwnership> |
| <value> I </value> |
| </directOrIndirectOwnership> |
| <natureOfOwnership> |
| <value> 401(k) Plan </value> |
| </natureOfOwnership> |
| </ownershipNature> |
| | | </nonDerivativeHolding> |
| | </nonDerivativeTable> |
| <derivativeTable> |
| | <derivativeHolding> |
| | | <securityTitle> |
| <value> Restricted Stock Unit </value> |
| </securityTitle> |
| | | <conversionOrExercisePrice> |
| <footnoteId id="F2"/> |
| </conversionOrExercisePrice> |
| | | <exerciseDate> |
| <footnoteId id="F3"/> |
| </exerciseDate> |
| | | <expirationDate> |
| <footnoteId id="F3"/> |
| </expirationDate> |
| | | <underlyingSecurity> |
| <underlyingSecurityTitle> |
| <value> Common Stock </value> |
| </underlyingSecurityTitle> |
| <underlyingSecurityShares> |
| <value> 6620.0 </value> |
| </underlyingSecurityShares> |
| </underlyingSecurity> |
| | | <postTransactionAmounts> |
| <sharesOwnedFollowingTransaction> |
| <value> 6620 </value> |
| </sharesOwnedFollowingTransaction> |
| </postTransactionAmounts> |
| | | <ownershipNature> |
| <directOrIndirectOwnership> |
| <value> D </value> |
| </directOrIndirectOwnership> |
| </ownershipNature> |
| | | </derivativeHolding> |
| | <derivativeHolding> |
| | | <securityTitle> |
| <value> Restricted Stock Unit </value> |
| </securityTitle> |
| | | <conversionOrExercisePrice> |
| <footnoteId id="F4"/> |
| </conversionOrExercisePrice> |
| | | <exerciseDate> |
| <footnoteId id="F5"/> |
| </exerciseDate> |
| | | <expirationDate> |
| <footnoteId id="F5"/> |
| </expirationDate> |
| | | <underlyingSecurity> |
| <underlyingSecurityTitle> |
| <value> Common Stock </value> |
| </underlyingSecurityTitle> |
| <underlyingSecurityShares> |
| <value> 4776.0 </value> |
| </underlyingSecurityShares> |
| </underlyingSecurity> |
| | | <postTransactionAmounts> |
| <sharesOwnedFollowingTransaction> |
| <value> 4776 </value> |
| </sharesOwnedFollowingTransaction> |
| </postTransactionAmounts> |
| | | <ownershipNature> |
| <directOrIndirectOwnership> |
| <value> D </value> |
| </directOrIndirectOwnership> |
| </ownershipNature> |
| | | </derivativeHolding> |
| | </derivativeTable> |
| <footnotes> |
| | <footnote id="F1"> Shares delivered to the issuer for the payment of withholding taxes due upon the vesting of restricted stock previously granted under the SPX FLOW Stock Compensation Plan. </footnote> |
| | <footnote id="F2"> 2020 restricted stock units granted pursuant to the SPX FLOW Stock Compensation Plan. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock. </footnote> |
| | <footnote id="F3"> The restricted stock units vest in three equal annual installments beginning on the first anniversary of the grant date. </footnote> |
| | <footnote id="F4"> 2019 restricted stock units granted pursuant to the SPX FLOW Stock Compensation Plan. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock. </footnote> |
| | <footnote id="F5"> The restricted stock units vest in three equal annual installments beginning on February 28, 2020. </footnote> |
| | </footnotes> |
| <remarks></remarks> |
| <ownerSignature> |
| | <signatureName> Peter Ryan, Attorney In Fact for Belinda Hyde </signatureName> |
| | <signatureDate> 2020-03-11 </signatureDate> |
| | </ownerSignature> |
| </ownershipDocument> |