<SEC-DOCUMENT>0001209191-16-127178.txt : 20160610 <SEC-HEADER>0001209191-16-127178.hdr.sgml : 20160610 <ACCEPTANCE-DATETIME>20160610185413 ACCESSION NUMBER: 0001209191-16-127178 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20160608 FILED AS OF DATE: 20160610 DATE AS OF CHANGE: 20160610 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: FIBROGEN INC CENTRAL INDEX KEY: 0000921299 STANDARD INDUSTRIAL CLASSIFICATION: PHARMACEUTICAL PREPARATIONS [2834] IRS NUMBER: 000000000 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 409 ILLINOIS STREET CITY: SAN FRANCISCO STATE: CA ZIP: 94158 BUSINESS PHONE: 415-978-1200 MAIL ADDRESS: STREET 1: 409 ILLINOIS STREET CITY: SAN FRANCISCO STATE: CA ZIP: 94158 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Kurkijarvi Kalevi CENTRAL INDEX KEY: 0001621333 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-36740 FILM NUMBER: 161709559 MAIL ADDRESS: STREET 1: C/O FIBROGEN, INC. STREET 2: 409 ILLINOIS ST., CITY: SAN FRANCISCO STATE: CA ZIP: 94158 </SEC-HEADER> <DOCUMENT> <TYPE>4 <SEQUENCE>1 <FILENAME>doc4.xml <DESCRIPTION>FORM 4 SUBMISSION <TEXT> <XML> <?xml version="1.0"?> <ownershipDocument> <schemaVersion>X0306</schemaVersion> <documentType>4</documentType> <periodOfReport>2016-06-08</periodOfReport> <notSubjectToSection16>0</notSubjectToSection16> <issuer> <issuerCik>0000921299</issuerCik> <issuerName>FIBROGEN INC</issuerName> <issuerTradingSymbol>FGEN</issuerTradingSymbol> </issuer> <reportingOwner> <reportingOwnerId> <rptOwnerCik>0001621333</rptOwnerCik> <rptOwnerName>Kurkijarvi Kalevi</rptOwnerName> </reportingOwnerId> <reportingOwnerAddress> <rptOwnerStreet1>C/O FIBROGEN, INC.</rptOwnerStreet1> <rptOwnerStreet2>409 ILLINOIS ST.</rptOwnerStreet2> <rptOwnerCity>SAN FRANCISCO</rptOwnerCity> <rptOwnerState>CA</rptOwnerState> <rptOwnerZipCode>94158</rptOwnerZipCode> <rptOwnerStateDescription></rptOwnerStateDescription> </reportingOwnerAddress> <reportingOwnerRelationship> <isDirector>1</isDirector> <isOfficer>0</isOfficer> <isTenPercentOwner>0</isTenPercentOwner> <isOther>0</isOther> </reportingOwnerRelationship> </reportingOwner> <derivativeTable> <derivativeTransaction> <securityTitle> <value>Stock Option (Right to Buy)</value> </securityTitle> <conversionOrExercisePrice> <value>19.05</value> </conversionOrExercisePrice> <transactionDate> <value>2016-06-08</value> </transactionDate> <deemedExecutionDate></deemedExecutionDate> <transactionCoding> <transactionFormType>4</transactionFormType> <transactionCode>A</transactionCode> <equitySwapInvolved>0</equitySwapInvolved> </transactionCoding> <transactionTimeliness> <value></value> </transactionTimeliness> <transactionAmounts> <transactionShares> <value>12000</value> </transactionShares> <transactionPricePerShare> <value>0.00</value> </transactionPricePerShare> <transactionAcquiredDisposedCode> <value>A</value> </transactionAcquiredDisposedCode> </transactionAmounts> <exerciseDate> <footnoteId id="F1"/> </exerciseDate> <expirationDate> <value>2026-06-08</value> </expirationDate> <underlyingSecurity> <underlyingSecurityTitle> <value>Common Stock</value> </underlyingSecurityTitle> <underlyingSecurityShares> <value>12000</value> </underlyingSecurityShares> </underlyingSecurity> <postTransactionAmounts> <sharesOwnedFollowingTransaction> <value>12000</value> </sharesOwnedFollowingTransaction> </postTransactionAmounts> <ownershipNature> <directOrIndirectOwnership> <value>D</value> </directOrIndirectOwnership> </ownershipNature> </derivativeTransaction> </derivativeTable> <footnotes> <footnote id="F1">The shares subject to the option vest and become exercisable quarterly over one year measured from June 8, 2016.</footnote> </footnotes> <remarks></remarks> <ownerSignature> <signatureName>/s/ Dorothy Pacini, Attorney-in-fact</signatureName> <signatureDate>2016-06-09</signatureDate> </ownerSignature> </ownershipDocument> </XML> </TEXT> </DOCUMENT> </SEC-DOCUMENT>