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Volpi Kirsten M – ‘4’ for 12/10/19 re: Tetra Tech Inc.

On:  Thursday, 12/12/19, at 6:36pm ET   ·   For:  12/10/19   ·   Accession #:  831641-19-208   ·   File #:  0-19655

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  As Of               Filer                 Filing    For·On·As Docs:Size             Issuer                      Filing Agent

12/12/19  Volpi Kirsten M                   4                      1:5K   Tetra Tech Inc.                   Tetra Tech Inc.

Statement of Changes in Beneficial Ownership of Securities by an Insider   —   Form 4   —   SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 4           Statement of Changes in Beneficial Ownership of     HTML      3K 
                Securities by an Insider --                                      
                wf-form4_157619377602439.xml/3.6


        

This ‘4’ Document is an XML Data File that may be rendered in various formats:

  Form 4    –   Plain Text   –  SEC Website  –  EDGAR System  –    XML Data    –  <?xml?> File
 
 
XML Data rendering:  Statement of Changes in Beneficial Ownership of Securities by an Insider — wf-form4_157619377602439.xml/3.6
 
                                                                                                                                                                                
<?xml version="1.0" encoding="windows-1252"?>
<ownershipDocument>
<schemaVersion> X0306 </schemaVersion>
<documentType> 4 </documentType>
<periodOfReport> 2019-12-10 </periodOfReport>
<notSubjectToSection16> 0 </notSubjectToSection16>
<issuer>
<issuerCik> 0000831641 </issuerCik>
<issuerName> TETRA TECH INC </issuerName>
<issuerTradingSymbol> TTEK </issuerTradingSymbol>
</issuer>
<reportingOwner>
<reportingOwnerId>
<rptOwnerCik> 0001582882 </rptOwnerCik>
<rptOwnerName> Volpi Kirsten M </rptOwnerName>
</reportingOwnerId>
<reportingOwnerAddress>
<rptOwnerStreet1> 3475 EAST FOOTHILL BOULEVARD </rptOwnerStreet1>
<rptOwnerStreet2></rptOwnerStreet2>
<rptOwnerCity> PASADENA, </rptOwnerCity>
<rptOwnerState> CA </rptOwnerState>
<rptOwnerZipCode> 91107 </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> 2019-12-10 </value>
</transactionDate>
<transactionCoding>
<transactionFormType> 4 </transactionFormType>
<transactionCode> S </transactionCode>
<equitySwapInvolved> 0 </equitySwapInvolved>
</transactionCoding>
<transactionAmounts>
<transactionShares>
<value> 425 </value>
</transactionShares>
<transactionPricePerShare>
<value> 85.985 </value>
</transactionPricePerShare>
<transactionAcquiredDisposedCode>
<value> D </value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value> 14783 </value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value> D </value>
</directOrIndirectOwnership>
</ownershipNature>
</nonDerivativeTransaction>
<nonDerivativeTransaction>
<securityTitle>
<value> COMMON STOCK </value>
</securityTitle>
<transactionDate>
<value> 2019-12-12 </value>
</transactionDate>
<transactionCoding>
<transactionFormType> 5 </transactionFormType>
<transactionCode> G </transactionCode>
<equitySwapInvolved> 0 </equitySwapInvolved>
</transactionCoding>
<transactionTimeliness>
<value> E </value>
</transactionTimeliness>
<transactionAmounts>
<transactionShares>
<value> 575 </value>
</transactionShares>
<transactionPricePerShare>
<value> 0 </value>
<footnoteId id="F1"/>
</transactionPricePerShare>
<transactionAcquiredDisposedCode>
<value> D </value>
</transactionAcquiredDisposedCode>
</transactionAmounts>
<postTransactionAmounts>
<sharesOwnedFollowingTransaction>
<value> 14208 </value>
</sharesOwnedFollowingTransaction>
</postTransactionAmounts>
<ownershipNature>
<directOrIndirectOwnership>
<value> D </value>
</directOrIndirectOwnership>
</ownershipNature>
</nonDerivativeTransaction>
</nonDerivativeTable>
<derivativeTable></derivativeTable>
<footnotes>
<footnote id="F1"> Bona fide gift. No compensation was given to the donor for the gifting of shares. </footnote>
</footnotes>
<remarks></remarks>
<ownerSignature>
<signatureName> /s/ Preston Hopson, Attorney-in-fact for Kirsten M. Volpi </signatureName>
<signatureDate> 2019-12-12 </signatureDate>
</ownerSignature>
</ownershipDocument>


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Filing Submission 0000831641-19-000208   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)
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