UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C SCHEDULE 13G. Under the Securities Exchange Act of (Amendment No.

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1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. _ ) * AtlassianCorporationPlc (NameofIssuer) CommonStock (TitleofClassofSecurities) G (CUSIPNumber) December29,2017 (DateofEventWhichRequiresFilingofthisStatement) ChecktheappropriateboxtodesignatetherulepursuanttowhichthisScheduleisfiled: [X] Rule13d-1(b) Rule13d-1(c) Rule13d-1(d) * Theremainderofthiscoverpageshallbefilledoutforareportingperson'sinitialfilingonthisformwithrespecttothesubjectclassofsecurities,andforany subsequentamendmentcontaininginformationwhichwouldalterthedisclosuresprovidedinapriorcoverpage. Theinformationrequiredintheremainderofthiscoverpageshallnotbedeemedtobe"filed"forthepurposeofSection18oftheSecuritiesExchangeActof1934 (the"act")orotherwisesubjecttotheliabilitiesofthatsectionoftheact,butshallbesubjecttoallotherprovisionsoftheact(however,seethenotes.)

2 CUSIPNo. G NAMESOFREPORTINGPERSONS WellingtonManagementGroupLLP 2. CHECKTHEAPPROPRIATEBOXIFAMEMBEROFAGROUP (a) (b) 3. SECUSEONLY 4. CITIZENSHIPORPLACEOFORGANIZATION Massachusetts NUMBEROF SHARES BENEFICIALLY OWNEDBYEACH REPORTING PERSONWITH 5.SOLEVOTINGPOWER 0 6.SHAREDVOTINGPOWER 3,887,510 7.SOLEDISPOSITIVEPOWER 0 8.SHAREDDISPOSITIVEPOWER 5,854, AGGREGATEAMOUNTBENEFICIALLYOWNEDBYEACHREPORTINGPERSON 5,854, CHECKIFTHEAGGREGATEAMOUNTINROW(9)EXCLUDESCERTAINSHARES 11. PERCENTOFCLASSREPRESENTEDBYAMOUNTINROW(9) 6.09% 12. TYPEOFREPORTINGPERSON HC

3 CUSIPNo. G NAMESOFREPORTINGPERSONS WellingtonGroupHoldingsLLP 2. CHECKTHEAPPROPRIATEBOXIFAMEMBEROFAGROUP (a) (b) 3. SECUSEONLY 4. CITIZENSHIPORPLACEOFORGANIZATION Delaware NUMBEROF SHARES BENEFICIALLY OWNEDBYEACH REPORTING PERSONWITH 5.SOLEVOTINGPOWER 0 6.SHAREDVOTINGPOWER 3,887,510 7.SOLEDISPOSITIVEPOWER 0 8.SHAREDDISPOSITIVEPOWER 5,854, AGGREGATEAMOUNTBENEFICIALLYOWNEDBYEACHREPORTINGPERSON 5,854, CHECKIFTHEAGGREGATEAMOUNTINROW(9)EXCLUDESCERTAINSHARES 11. PERCENTOFCLASSREPRESENTEDBYAMOUNTINROW(9) 6.09% 12. TYPEOFREPORTINGPERSON HC

4 CUSIPNo. G NAMESOFREPORTINGPERSONS WellingtonInvestmentAdvisorsHoldingsLLP 2. CHECKTHEAPPROPRIATEBOXIFAMEMBEROFAGROUP (a) (b) 3. SECUSEONLY 4. CITIZENSHIPORPLACEOFORGANIZATION Delaware NUMBEROF SHARES BENEFICIALLY OWNEDBYEACH REPORTING PERSONWITH 5.SOLEVOTINGPOWER 0 6.SHAREDVOTINGPOWER 3,887,510 7.SOLEDISPOSITIVEPOWER 0 8.SHAREDDISPOSITIVEPOWER 5,854, AGGREGATEAMOUNTBENEFICIALLYOWNEDBYEACHREPORTINGPERSON 5,854, CHECKIFTHEAGGREGATEAMOUNTINROW(9)EXCLUDESCERTAINSHARES 11. PERCENTOFCLASSREPRESENTEDBYAMOUNTINROW(9) 6.09% 12. TYPEOFREPORTINGPERSON HC

5 Item 1. Item 2. Item 3. Item 4. (a) Name of Issuer AtlassianCorporationPlc (b) Address of Issuer's Principal Executive Offices ExchangeHouse,PrimroseStreet LondonEC2A2EG (a) Name of Person Filing WellingtonManagementGroupLLP WellingtonGroupHoldingsLLP WellingtonInvestmentAdvisorsHoldingsLLP (b) Address of Principal Business Office or, if None, Residence c/owellingtonmanagementcompanyllp 280CongressStreet Boston,MA02210 (c) Citizenship WellingtonManagementGroupLLP-Massachusetts WellingtonGroupHoldingsLLP-Delaware WellingtonInvestmentAdvisorsHoldingsLLP-Delaware (d) Title of Class of Securities CommonStock (e) CUSIP Number G If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a: (a) BrokerordealerregisteredunderSection15oftheAct(15U.S.C.78o). (b) BankasdefinedinSection3(a)(6)oftheAct(15U.S.C.78c). (c) InsuranceCompanyasdefinedinSection3(a)(19)oftheAct(15U.S.C.78c). (d) InvestmentCompanyregisteredunderSection8oftheInvestmentCompanyActof1940(15U.S.C. 80a-8). (e) AninvestmentadviserinaccordancewithRule240.13d-1(b)(1)(ii)(E); (f) AnemployeebenefitplanorendowmentfundinaccordancewithRule240.13d-1(b)(1)(ii)(F); (g) [X] AparentholdingcompanyorcontrolpersoninaccordancewithRule240.13d-1(b)(1)(ii)(G); (h) AsavingsassociationasdefinedinSection3(b)oftheFederalDepositInsuranceAct(12U.S.C.1813); (i) AchurchplanthatisexcludedfromthedefinitionofaninvestmentcompanyunderSection3(c)(14)of theinvestmentcompanyactof1940(15u.s.c.80a-3); (j) Group,inaccordancewithRule240.13d-1(b)(1)(ii)(J). IfthisstatementisfiledpursuanttoRule13d-1(c),checkthisbox Ownership. Providethefollowinginformationregardingtheaggregatenumberandpercentageoftheclassofsecuritiesoftheissueridentified initem1. (a) AmountBeneficiallyOwned: SeetheresponsestoItem9ontheattachedcoverpages. (b) PercentofClass: (c) SeetheresponsestoItem11ontheattachedcoverpages. Numberofsharesastowhichsuchpersonhas:

6 Item 5. Item 6. Item 7. (i) solepowertovoteortodirectthevote 0 (ii) sharedpowertovoteortodirectthevote (iii) solepowertodisposeortodirectthedisposition of (iv) sharedpowertodisposeortodirectthe dispositionof Ownership of Five Percent or Less of Class. SeetheresponsestoItem6ontheattachedcover pages. 0 SeetheresponsestoItem8ontheattachedcover pages. Ifthisstatementisbeingfiledtoreportthefactthatasofthedatehereofthereportingpersonhasceasedtobethe beneficialownerofmorethanfivepercentoftheclassofsecurities,checkthefollowing: Ownership of More than Five Percent on Behalf of Another Person. ThesecuritiesastowhichthisScheduleisfiledareownedofrecordbyclientsofoneormoreinvestmentadvisers identifiedinexhibitadirectlyorindirectlyownedbywellingtonmanagementgroupllp.thoseclientshavethe righttoreceive,orthepowertodirectthereceiptof,dividendsfrom,ortheproceedsfromthesaleof,such securities.nosuchclientisknowntohavesuchrightorpowerwithrespecttomorethanfivepercentofthisclass ofsecurities,exceptasfollows: NotApplicable. Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company. SeeattachedExhibitA.

7 Item 8. Item 9. Item 10. Identification and Classification of Members of the Group. NotApplicable. Notice of Dissolution of Group. NotApplicable. Certification. BysigningbelowIcertifythat,tothebestofmyknowledgeandbelief,thesecuritiesreferredtoabovewere acquiredandareheldintheordinarycourseofbusinessandwerenotacquiredandarenotheldforthepurposeof orwiththeeffectofchangingorinfluencingthecontroloftheissuerofthesecuritiesandwerenotacquiredand arenotheldinconnectionwithorasaparticipantinanytransactionhavingthatpurposeoreffect. SIGNATURE Afterreasonableinquiryandtothebestofmyknowledgeandbelief,Icertifythattheinformationset forthinthisstatementistrue,completeandcorrect. By:WellingtonManagementGroupLLP By:WellingtonGroupHoldingsLLP By:WellingtonInvestmentAdvisorsHoldingsLLP Exhibit A PursuanttotheinstructionsinItem7ofSchedule13G,thefollowingliststheidentityandItem3 classificationofeachrelevantentitythatbeneficiallyownssharesofthesecurityclassbeingreportedon thisschedule13g. WellingtonGroupHoldingsLLP HC WellingtonInvestmentAdvisorsLLP HC WellingtonManagementGlobalHoldings,Ltd.-HC Oneormoreofthefollowinginvestmentadvisers(the WellingtonInvestmentAdvisers ): WellingtonManagementCompanyLLP IA WellingtonManagementCanadaLLC IA WellingtonManagementSingaporePteLtd IA WellingtonManagementHongKongLtd IA

8 WellingtonManagementInternationalLtd IA WellingtonManagementJapanPteLtd IA WellingtonManagementAustraliaPtyLtd-IA ThesecuritiesastowhichthisScheduleisfiledbyWellingtonManagementGroupLLP,asparent holdingcompanyofcertainholdingcompaniesandthewellingtoninvestmentadvisers,areownedof recordbyclientsofthewellingtoninvestmentadvisers.wellingtoninvestmentadvisorsholdingsllp controlsdirectly,orindirectlythroughwellingtonmanagementglobalholdings,ltd.,thewellington InvestmentAdvisers.WellingtonInvestmentAdvisorsHoldingsLLPisownedbyWellingtonGroup HoldingsLLP.WellingtonGroupHoldingsLLPisownedbyWellingtonManagementGroupLLP. EXHIBIT B JOINT FILING AGREEMENT TheundersignedherebyagreethatthisSchedule13G(the Schedule13G )withrespecttothecommon stockofatlassiancorporationplcis,andanyadditionalamendmenttheretosignedbyeachofthe undersignedshallbe,filedonbehalfofeachundersignedpursuanttoandinaccordancewiththe provisionsof13d-1(k)underthesecuritiesexchangeactof1934,asamended,andthatallsubsequent amendmentstotheschedule13gshallbefiledonbehalfofeachoftheundersignedwithoutthe necessityoffilingadditionaljointfilingagreements.theundersignedacknowledgethateachshallbe responsibleforthetimelyfilingofsuchamendments,andforthecompletenessandaccuracyofthe informationconcerningitcontainedtherein,butshallnotberesponsibleforthecompletenessand accuracyoftheinformationconcerningtheother,excepttotheextentthatitknowsorhasreasonto believethatsuchinformationisinaccurate.itisunderstoodandagreedthatthejointfilingofthe Schedule13Gshallnotbeconstruedasanadmissionthatthepersonsnamedhereinconstituteagroupfor purposesofregulation13d-gofthesecuritiesexchangeactof1934,norisajointventureforpurposes oftheinvestmentcompanyactof1940. By:WellingtonManagementGroupLLP By:WellingtonGroupHoldingsLLP By:WellingtonInvestmentAdvisorsHoldingsLLP