| | | | | | | | | | | | | | | | | | | | | | |
| <?xml version="1.0" encoding="windows-1252"?> |
| <ownershipDocument> |
| <schemaVersion> X0306 </schemaVersion> |
| <documentType> 4/A </documentType> |
| <periodOfReport> 2022-05-24 </periodOfReport> |
| <dateOfOriginalSubmission> 2022-05-24 </dateOfOriginalSubmission> |
| <notSubjectToSection16> 0 </notSubjectToSection16> |
| <issuer> |
| | <issuerCik> 0001305773 </issuerCik> |
| | <issuerName> Conformis Inc </issuerName> |
| | <issuerTradingSymbol> CFMS </issuerTradingSymbol> |
| | </issuer> |
| <reportingOwner> |
| | <reportingOwnerId> |
| | | <rptOwnerCik> 0001012087 </rptOwnerCik> |
| | | <rptOwnerName> FALLON KENNETH P III </rptOwnerName> |
| | | </reportingOwnerId> |
| | <reportingOwnerAddress> |
| | | <rptOwnerStreet1> C/O CONFORMIS, INC. </rptOwnerStreet1> |
| | | <rptOwnerStreet2> 600 TECHNOLOGY PARK DRIVE </rptOwnerStreet2> |
| | | <rptOwnerCity> BILLERICA </rptOwnerCity> |
| | | <rptOwnerState> MA </rptOwnerState> |
| | | <rptOwnerZipCode> 01821 </rptOwnerZipCode> |
| | | <rptOwnerStateDescription></rptOwnerStateDescription> |
| | | </reportingOwnerAddress> |
| | <reportingOwnerRelationship> |
| | | <isDirector> 1 </isDirector> |
| | | <isOfficer> 0 </isOfficer> |
| | | <isTenPercentOwner> 0 </isTenPercentOwner> |
| | | <isOther> 0 </isOther> |
| | | <officerTitle></officerTitle> |
| | | <otherText></otherText> |
| | | </reportingOwnerRelationship> |
| | </reportingOwner> |
| <nonDerivativeTable> |
| | <nonDerivativeTransaction> |
| | | <securityTitle> |
| <value> Common Stock </value> |
| </securityTitle> |
| | | <transactionDate> |
| <value> 2022-05-24 </value> |
| </transactionDate> |
| | | <transactionCoding> |
| <transactionFormType> 4 </transactionFormType> |
| <transactionCode> A </transactionCode> |
| <equitySwapInvolved> 0 </equitySwapInvolved> |
| </transactionCoding> |
| | | <transactionAmounts> |
| <transactionShares> |
| <value> 130870 </value> |
| <footnoteId id="F1"/> |
| <footnoteId id="F2"/> |
| </transactionShares> |
| <transactionPricePerShare> |
| <value> 0 </value> |
| </transactionPricePerShare> |
| <transactionAcquiredDisposedCode> |
| <value> A </value> |
| </transactionAcquiredDisposedCode> |
| </transactionAmounts> |
| | | <postTransactionAmounts> |
| <sharesOwnedFollowingTransaction> |
| <value> 507995 </value> |
| </sharesOwnedFollowingTransaction> |
| </postTransactionAmounts> |
| | | <ownershipNature> |
| <directOrIndirectOwnership> |
| <value> D </value> |
| </directOrIndirectOwnership> |
| </ownershipNature> |
| | | </nonDerivativeTransaction> |
| | </nonDerivativeTable> |
| <derivativeTable></derivativeTable> |
| <footnotes> |
| | <footnote id="F1"> Represents the number of RSAs granted to the Reporting Person pursuant to Conformis' 2015 Stock Incentive Plan. The shares will vest 100% on the one year anniversary of the grant date. </footnote> |
| | <footnote id="F2"> This amendment is being filed to address a technical filing error in the name of the Reporting Person on the signature line of the Form 4 filed on May 26, 2022. </footnote> |
| | </footnotes> |
| <remarks></remarks> |
| <ownerSignature> |
| | <signatureName> /s/ Denise E. Pedulla, Attorney-in-Fact Kenneth P Fallon III </signatureName> |
| | <signatureDate> 2022-05-26 </signatureDate> |
| | </ownerSignature> |
| </ownershipDocument> |
