UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C FORM 8-K. Twilio Inc. (Exactnameofregistrantasspecifiedinitscharter)

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1 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 13, 2018 Twilio Inc. (Exactnameofregistrantasspecifiedinitscharter) Delaware (Stateorotherjurisdiction ofincorporation) (Commission FileNumber) (IRSEmployer IdentificationNo.) 375 Beale Street, Suite 300 San Francisco, California (Addressofprincipalexecutiveoffices)(ZipCode) (415) (Registrant stelephonenumber,includingareacode) Not applicable (Formernameorformeraddress,ifchangedsincelastreport) ChecktheappropriateboxbelowiftheForm8-Kfilingisintendedtosimultaneouslysatisfythefilingobligationoftheregistrantunderanyofthefollowing provisions: WrittencommunicationspursuanttoRule425undertheSecuritiesAct(17CFR ) SolicitingmaterialpursuanttoRule14a-12undertheExchangeAct(17CFR240.14a-12) Pre-commencementcommunicationspursuanttoRule14d-2(b)undertheExchangeAct(17CFR240.14d-2(b)) Pre-commencementcommunicationspursuanttoRule13e-4(c)undertheExchangeAct(17CFR240.13e-4(c)) IndicatebycheckmarkwhethertheregistrantisanemerginggrowthcompanyasdefinedinRule405oftheSecuritiesActof1933( ofthischapter)or Rule12b-2oftheSecuritiesExchangeActof1934( b-2ofthischapter). Emerginggrowthcompany Ifanemerginggrowthcompany,indicatebycheckmarkiftheregistranthaselectednottousetheextendedtransitionperiodforcomplyingwithanynewor revisedfinancialaccountingstandardsprovidedpursuanttosection13(a)oftheexchangeact.

2 Item 2.02 Results of Operations and Financial Condition. OnFebruary13,2018,TwilioInc.(the Company )issuedapressreleaseannouncingitsfinancialresultsforthequarterandfullyearendeddecember31, 2017.AcopyofthepressreleaseisfurnishedherewithasExhibit99.1. TheinformationfurnishedunderthisItem2.02andintheaccompanyingExhibit99.1shallnotbedeemed filed forpurposesofsection18ofthesecurities ExchangeActof1934,asamended(the ExchangeAct ),orincorporatedbyreferenceinanyfilingunderthesecuritiesactof1933,asamended,ortheexchange Actregardlessofanygeneralincorporationlanguageinsuchfiling,unlessexpresslyincorporatedbyspecificreferenceinsuchfiling. Item Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. OnFebruary13,2018,theCompanyannouncedthatLeeKirkpatrick,theCompany schieffinancialofficer,willberesigningfromhispositionwiththe Company.TheCompanyhascommencedasearchforareplacementChiefFinancialOfficer.TheeffectivedateforMr.Kirkpatrick sresignationhasnotbeen determinedandmr.kirkpatrickintendstocontinuewiththecompanythroughthetransition. Item 9.01 Financial Statements and Exhibits. (d)exhibits. Exhibit No. Description 99.1 PressreleaseissuedbyTwilioInc.datedFebruary13,2018.

3 SIGNATURES PursuanttotherequirementsoftheSecuritiesExchangeActof1934,theregistranthasdulycausedthisreporttobesignedonitsbehalfbytheundersigned hereuntodulyauthorized. TWILIO INC. Date:February13,2018 By: /s/leekirkpatrick Name: Title: LeeKirkpatrick ChiefFinancialOfficer

4 EXHIBIT INDEX Exhibit No. Description 99.1 PressreleaseissuedbyTwilioInc.datedFebruary13,2018.

5 Exhibit 99.1 Twilio Announces Fourth Quarter and Full Year 2017 Results Q4TotalRevenueof$115.2million,up41%year-over-year Q4BaseRevenueof$105.3million,up40%year-over-year Q4Dollar-BasedNetExpansionRateof118% SANFRANCISCO--(BUSINESSWIRE)--February13,2018--TwilioInc.(NYSE:TWLO),theleadingCloudCommunicationsPlatformcompany,todayreported financialresultsforitsfourthquarterandfullyearendeddecember31,2017. Wearekickingoffourtenthyearasacompanywithfabulousmomentum.I mveryproudoftheteamforourfourthquarterperformance,butmyexcitementlies inthefoundationswe velaidforthenexttenyearsoftwilio, saidjefflawson,twilio sco-founderandchiefexecutiveofficer. Wearepoisedforastellar yearahead,builtonourrelentlessfocusoncustomersuccess,quality,andsoftware-fueledinnovation. Fourth Quarter 2017 Financial Highlights Totalrevenueof$115.2millionforthefourthquarterof2017,up41%fromthefourthquarterof2016and15%sequentiallyfromthethirdquarterof2017. Baserevenueof$105.3millionforthefourthquarterof2017,up40%fromthefourthquarterof2016and14%sequentiallyfromthethirdquarterof2017. GAAPlossfromoperationsof$20.2millionforthefourthquarterof2017,comparedwithGAAPlossfromoperationsof$12.8millionforthefourth quarterof2016.non-gaaplossfromoperationsof$3.9millionforthefourthquarterof2017,comparedwithnon-gaapprofitfromoperationsof$0.1 millionforthefourthquarterof2016. GAAPnetlosspershareattributabletocommonstockholdersof$0.20basedon93.2millionweightedaveragesharesoutstandinginthefourthquarterof 2017,comparedwithGAAPnetlosspershareattributabletocommonstockholdersof$0.15basedon86.1millionweightedaveragesharesoutstandingin thefourthquarterof2016. Non-GAAPnetlosspershareattributabletocommonstockholdersof$0.03basedon93.2millionweightedaveragesharesoutstandinginthefourthquarter of2017,comparedwithnon-gaapnetprofitpershareattributabletocommonstockholdersof$0.00basedon100.2millionnon-gaapweightedaverage sharesoutstandinginthefourthquarterof2016. Full Year 2017 Financial Highlights Totalrevenueof$399.0millionforthefullyear2017,up44%fromthefullyear2016. Baserevenueof$365.5millionforthefullyear2017,up49%fromthefullyear2016. GAAPlossfromoperationsof$66.1millionforthefullyear2017,comparedwithGAAPlossfromoperationsof$41.3millionforthefullyear2016.Non- GAAPlossfromoperationsof$20.1millionforthefullyear2017,comparedwithnon-GAAPlossfromoperationsof$12.2millionforthefullyear2016. GAAPnetlosspershareattributabletocommonstockholdersof$0.70basedon91.2millionweightedaveragesharesoutstandingforthefullyear2017, comparedwithgaapnetlosspershareattributabletocommonstockholdersof$0.78basedon53.1millionweightedaveragesharesoutstandingforthe fullyear2016. Non-GAAPnetlosspershareattributabletocommonstockholdersof$0.19basedon91.2millionnon-GAAPweightedaveragedilutedsharesoutstanding forthefullyear2017,comparedwithnon-gaapnetlosspershareattributabletocommonstockholdersof$0.16basedon78.6millionnon-gaap weightedaveragedilutedsharesoutstandingforthefullyear2016.

6 Key Metrics and Recent Business Highlights 48,979ActiveCustomerAccountsasofDecember31,2017,comparedto36,606ActiveCustomerAccountsasofDecember31,2016. Dollar-BasedNetExpansionRatewas118%forthefourthquarterof2017,comparedto155%forthefourthquarterof2016. LaunchedourEngageRoadshowprograminNewYorkCityandMelbourne,bringingtogetherdevelopersandtechnicaldecisionmakerstosharetheir experiences. WelcomedSaraVarni,formerlytheSVPofMarketingforSalesforce ssalescloudbusiness,asourchiefmarketingofficer.sarawillbefocusedon scalingourmarketingeffortsaroundtheworld,supportingourcommitmenttoourdeveloper-firststrategywhilesimultaneouslytakingontheenterprise market. AddedRonHuddleston,formerlytheCorporateVicePresidentoftheOneCommercialPartnerOrganizationforMicrosoft,asourChiefPartnerOfficer. RonwillberesponsibleforunifyingthepartnerexperiencesforTwilioacrossSolutionPartners,SIs,VARs,andResellers. AnnouncedthatTwilioStudio,ournewdraganddropeditor,hasmovedintoBeta.TwilioStudioisdesignedtobothexpandtheuniverseofpeoplethatcan engagewithourplatformandacceleratetheirdevelopmenttime. Chief Financial Officer Transition TheCompanyalsoannouncedplansforatransitioninfinanceleadership.LeeKirkpatrick,whohasservedasTwilio schieffinancialofficersincemay2012,has informedthecompanyanditsboardofdirectorsofhisdecisiontoleavethecompany.toensureanorderlytransitionandcontinuityofoperations,kirkpatrick willcontinuetoserveascfountilhissuccessorisfoundandhasmovedintotherole.thesearchprocesswillbeginshortlyandisexpectedtobecompletedbefore theendoftheyear. Outlook TwilioisprovidingguidanceforthefirstquarterendingMarch31,2018andfullyearendingDecember31,2018asfollows:

7 Quarter ending March 31, 2018: TotalRevenue(millions) $ to $ BaseRevenue(millions) $ to $ Non-GAAPlossfromoperations(millions) $ 7.0 to $ 6.0 Non-GAAPnetlosspershare $ 0.07 to $ 0.06 Weightedaveragesharesoutstanding(millions) 94.5 Full year ending December 31, 2018: TotalRevenue(millions) $ to $ BaseRevenue(millions) $ to $ Non-GAAPlossfromoperations(millions) $ 15.5 to $ 11.5 Non-GAAPnetlosspershare $ 0.14 to $ 0.10 Weightedaveragesharesoutstanding(millions) 96.0 Conference Call Information Twiliowillhostaconferencecalltoday,February13,2018,todiscussfourthquarterandfullyear2017financialresults,aswellasthefirstquarterandfullyear 2018outlook,at2p.m.PacificTime,5p.m.EasternTime.Alivewebcastoftheconferencecall,aswellasareplayofthecall,willbeavailableat conferenceidis followingthecompletionofthecallthrough11:59pmeasterntimeonfebruary20,2018,areplaywillbeavailablebydialing(800) or+1(416) (outsidetheU.S.andCanada)andenteringpasscode Twiliohasused,andintendstocontinuetouse,itsinvestorrelations websiteasameansofdisclosingmaterialnon-publicinformationandforcomplyingwithitsdisclosureobligationsunderregulationfd. About Twilio Inc. Twilio'smissionistofuelthefutureofcommunications.DevelopersandbusinessesuseTwiliotomakecommunicationsrelevantandcontextualbyembedding messaging,voice,andvideocapabilitiesdirectlyintotheirsoftwareapplications.foundedin2008,twiliohasover900employees,withheadquartersinsan FranciscoandotherofficesinBogotá,Dublin,HongKong,London,Madrid,Malmö,MountainView,Munich,NewYorkCity,SingaporeandTallinn. Forward-Looking Statements Thispressreleaseandtheaccompanyingconferencecallcontainsforward-lookingstatementswithinthemeaningofthefederalsecuritieslaws,whichstatements involvesubstantialrisksanduncertainties.forward-lookingstatementsgenerallyrelatetofutureeventsorourfuturefinancialoroperatingperformance.insome cases,youcanidentifyforward-lookingstatementsbecausetheycontainwordssuchas may, will, should, expects, plans, anticipates, could, intends, target, projects, contemplates, believes, estimates, predicts, potential or continue orthenegativeofthesewordsorothersimilarterms orexpressionsthatconcernourexpectations,strategy,plansorintentions.forward-lookingstatementscontainedinthispressreleaseinclude,butarenotlimitedto, statementsabout:twilio soutlookforthequarterendingmarch31,2018andfullyearendingdecember31,2018andtwilio sexpectationsregardingitsproducts andsolutions.youshouldnotrelyuponforward-lookingstatementsaspredictionsoffutureevents.

8 Theoutcomeoftheeventsdescribedintheseforward-lookingstatementsissubjecttoknownandunknownrisks,uncertainties,andotherfactorsthatmaycause Twilio sactualresults,performance,orachievementstodiffermateriallyfromthosedescribedintheforward-lookingstatements,including,amongotherthings: adversechangesingeneraleconomicormarketconditions;changesinthemarketforcommunications;twilio sabilitytoadaptitsproductstomeetevolving marketandcustomerdemandsandrapidtechnologicalchange;twilio sabilitytogeneratesufficientrevenuestoachieveorsustainprofitability;twilio sabilityto retaincustomersandattractnewcustomers;twilio slimitedoperatinghistory,whichmakesitdifficulttoevaluateitsprospectsandfutureoperatingresults; Twilio sabilitytoeffectivelymanageitsgrowth;andtwilio sabilitytocompeteeffectivelyinanintenselycompetitivemarket. Theforward-lookingstatementscontainedinthispressreleasearealsosubjecttoadditionalrisks,uncertainties,andfactors,includingthosemorefullydescribedin Twilio smostrecentfilingswiththesecuritiesandexchangecommission,includingitsform10-qforthequarterendedseptember30,2017filedonnovember 14,2017.Furtherinformationonpotentialrisksthatcouldaffectactualresultswillbeincludedinthesubsequentperiodicandcurrentreportsandotherfilingsthat TwiliomakeswiththeSecuritiesandExchangeCommissionfromtimetotime.Moreover,Twiliooperatesinaverycompetitiveandrapidlychanging environment,andnewrisksanduncertaintiesmayemergethatcouldhaveanimpactontheforward-lookingstatementscontainedinthispressrelease. Forward-lookingstatementsrepresentTwilio smanagement sbeliefsandassumptionsonlyasofthedatesuchstatementsaremade.twilioundertakesno obligationtoupdateanyforward-lookingstatementsmadeinthispressreleasetoreflecteventsorcircumstancesafterthedateofthispressreleaseortoreflectnew informationortheoccurrenceofunanticipatedevents,exceptasrequiredbylaw. Use of Non-GAAP Financial Measures ToprovideinvestorsandotherswithadditionalinformationregardingTwilio sresults,thefollowingnon-gaapfinancialmeasuresaredisclosed:non-gaap grossprofitandgrossmargin,non-gaapoperatingexpenses,non-gaaplossfromoperationsandoperatingmargin,non-gaapnetlossattributabletocommon stockholders,andnon-gaapnetlosspershareattributabletocommonstockholders,basicanddiluted.

9 Non-GAAPGrossProfitandNon-GAAPGrossMargin.Fortheperiodspresented,Twiliodefinesnon-GAAPgrossprofitandnon-GAAPgrossmarginasGAAP grossprofitandgaapgrossmargin,respectively,adjustedtoexcludestock-basedcompensationandamortizationofacquiredintangibles. Non-GAAPOperatingExpenses.Fortheperiodspresented,Twiliodefinesnon-GAAPoperatingexpenses(includingcategoriesofoperatingexpenses)asGAAP operatingexpenses(andcategoriesofoperatingexpenses)adjustedtoexclude,asapplicable,stock-basedcompensation,amortizationofacquiredintangibles, acquisition-relatedexpenses,andpayrolltaxesrelatedtostock-basedcompensation. Non-GAAPLossfromOperationsandNon-GAAPOperatingMargin.Fortheperiodspresented,Twiliodefinesnon-GAAPlossfromoperationsandnon-GAAP operatingmarginasgaaplossfromoperationsandgaapoperatingmargin,respectively,adjustedtoexcludestock-basedcompensation,amortizationof acquiredintangibles,acquisition-relatedexpenses,andpayrolltaxesrelatedtostock-basedcompensation. Non-GAAPNetLossAttributabletoCommonStockholdersandNon-GAAPNetLossPerShareAttributabletoCommonStockholders,BasicandDiluted.For theperiodspresented,twiliodefinesnon-gaapnetlossattributabletocommonstockholdersandnon-gaapnetlosspershareattributabletocommon stockholders,basicanddiluted,asgaapnetlossattributabletocommonstockholdersandgaapnetlosspershareattributabletocommonstockholders,basic anddiluted,respectively,adjustedtoexcludestock-basedcompensation,amortizationofacquiredintangibles,acquisition-relatedexpenses,andpayrolltaxes relatedtostock-basedcompensation. Twilio smanagementusestheforegoingnon-gaapfinancialinformation,collectively,toevaluateitsongoingoperationsandforinternalplanningandforecasting purposes.twilio smanagementbelievesthatnon-gaapfinancialinformation,whentakencollectively,maybehelpfultoinvestorsbecauseitprovides consistencyandcomparabilitywithpastfinancialperformance,facilitatesperiod-to-periodcomparisonsofresultsofoperations,andassistsincomparisonswith othercompanies,manyofwhichusesimilarnon-gaapfinancialinformationtosupplementtheirgaapresults.non-gaapfinancialinformationispresentedfor supplementalinformationalpurposesonly,andshouldnotbeconsideredasubstituteforfinancialinformationpresentedinaccordancewithgaap,andmaybe differentfromsimilarly-titlednon-gaapmeasuresusedbyothercompanies.whenevertwiliousesanon-gaapfinancialmeasure,areconciliationisprovidedto themostdirectlycomparablefinancialmeasurestatedinaccordancewithgaap.investorsareencouragedtoreviewtherelatedgaapfinancialmeasuresandthe reconciliationofthesenon-gaapfinancialmeasurestotheirmostdirectlycomparablegaapfinancialmeasures. WithrespecttoTwilio sguidanceasprovidedunder Outlook above,twiliohasnotreconcileditsexpectationsastonon-gaaplossfromoperationstogaap lossfromoperationsornon-gaapnetlosspersharetogaapnetlosspersharebecausestock-basedcompensationexpensecannotbereasonablycalculatedor predictedatthistime.accordingly,areconciliationisnotavailablewithoutunreasonableeffort.

10 Operating Metrics Twilioreviewsanumberofoperatingmetricstoevaluateitsbusiness,measureperformance,identifytrends,formulatebusinessplans,andmakestrategic decisions.theseincludethenumberofactivecustomeraccounts,baserevenue,anddollar-basednetexpansionrate. NumberofActiveCustomerAccounts.TwiliobelievesthatthenumberofActiveCustomerAccountsisanimportantindicatorofthegrowthofitsbusiness,the marketacceptanceofitsplatformandfuturerevenuetrends.twiliodefinesanactivecustomeraccountattheendofanyperiodasanindividualaccount,as identifiedbyauniqueaccountidentifier,forwhichtwiliohasrecognizedatleast$5ofrevenueinthelastmonthoftheperiod.twiliobelievesthatuseofits platformbycustomersatorabovethe$5permonththresholdisastrongerindicatorofpotentialfutureengagementthantrialusageofitsplatformorusageat levelsbelow$5permonth.asingleorganizationmayconstitutemultipleuniqueactivecustomeraccountsifithasmultipleaccountidentifiers,eachofwhichis treatedasaseparateactivecustomeraccount. BaseRevenue.TwiliomonitorsBaseRevenueasoneofthemorereliableindicatorsoffuturerevenuetrends.BaseRevenueconsistsofallrevenueotherthan revenuefromlargeactivecustomeraccountsthathaveneverenteredinto12-monthminimumrevenuecommitmentcontractswithtwilio,whichthecompany referstoasvariablecustomeraccounts.whilealmostalloftwilio scustomersexhibitsomelevelofvariabilityintheusageofitsproducts,basedonthe experienceoftwilio smanagement,twiliobelievesthatvariablecustomeraccountsaremorelikelytohavesignificantfluctuationsinusageofitsproductsfrom periodtoperiod,andthereforethatrevenuefromvariablecustomeraccountsmayalsofluctuatesignificantlyfromperiodtoperiod.thisbehaviorisbest evidencedbythedecisionofsuchcustomersnottoenterintocontractswithtwiliothatcontainminimumrevenuecommitments,eventhoughtheymayspend significantamountsontheuseofthecompany sproductsandtheymaybeforegoingmorefavorabletermsoftenavailabletocustomersthatenterintocommitted contractswithtwilio.thisvariabilityadverselyaffectstwilio sabilitytorelyuponrevenuefromvariablecustomeraccountswhenanalyzingexpectedtrendsin futurerevenue. ForhistoricalperiodsthroughMarch31,2016,TwiliodefinedaVariableCustomerAccountasanActiveCustomerAccountthat(i)hadneversignedaminimum revenuecommitmentcontractwiththecompanyforatermofatleast12monthsand(ii)hasmetorexceeded1%ofthecompany srevenueinanyquarterinthe periodspresentedthroughmarch31,2016.toallowforconsistentperiod-to-periodcomparisons,intheeventacustomerqualifiedasavariablecustomeraccount asofmarch31,2016,orapreviouslyvariablecustomeraccountceasedtobeanactivecustomeraccountasofsuchdate,twilioincludedsuchcustomerasa VariableCustomerAccountinallperiodspresented.ForreportingperiodsstartingwiththethreemonthsendedJune30,2016,TwiliodefinesaVariableCustomer Accountasacustomeraccountthat(a)hasbeencategorizedasaVariableCustomerAccountinanypriorquarter,aswellas(b)anynewcustomeraccountthat(i) hasneversignedaminimumrevenuecommitmentcontractwithtwilioforatermofatleast12monthsand(ii)meetsorexceeds1%ofthecompany srevenuein aquarter.onceacustomeraccountisdeemedtobeavariablecustomeraccountinanyperiod,theyremainavariablecustomeraccountinsubsequentperiods unlesstheyenterintoaminimumrevenuecommitmentcontractwithtwilioforatermofatleast12months.

11 Dollar-BasedNetExpansionRate.Twilio sabilitytodrivegrowthandgenerateincrementalrevenuedepends,inpart,onthecompany sabilitytomaintainand growitsrelationshipswithexistingactivecustomeraccountsandtoincreasetheiruseoftheplatform.animportantwayinwhichtwiliotracksitsperformance inthisareaisbymeasuringthedollar-basednetexpansionrateforactivecustomeraccounts,otherthanvariablecustomeraccounts.twilio sdollar-based NetExpansionRateincreaseswhensuchActiveCustomerAccountsincreasetheirusageofaproduct,extendtheirusageofaproducttonewapplicationsoradopt anewproduct.twilio sdollar-basednetexpansionratedecreaseswhensuchactivecustomeraccountsceaseorreducetheirusageofaproductorwhenthe Companylowersusagepricesonaproduct.Asourcustomersgrowtheirbusinessesandextendtheuseofourplatform,theysometimescreatemultiplecustomer accountswithusforoperationalorotherreasons.assuch,forreportingperiodsstartingwiththethreemonthsendeddecember31,2016,whenweidentifya significantcustomerorganization(definedasasinglecustomerorganizationgeneratingmorethan1%ofrevenueinaquarterlyreportingperiod)thathascreateda newactivecustomeraccount,thisnewactivecustomeraccountistiedto,andrevenuefromthisnewactivecustomeraccountisincludedwith,theoriginal ActiveCustomerAccountforthepurposesofcalculatingthismetric.TwiliobelievesthatmeasuringDollar-BasedNetExpansionRateonrevenuegeneratedfrom ActiveCustomerAccounts,otherthanVariableCustomerAccounts,providesamoremeaningfulindicationoftheperformanceoftheCompany seffortsto increaserevenuefromexistingcustomeraccounts. Twilio sdollar-basednetexpansionratecomparestherevenuefromactivecustomeraccounts,otherthanvariablecustomeraccounts,inaquartertothesame quarterintheprioryear.tocalculatethedollar-basednetexpansionrate,thecompanyfirstidentifiesthecohortofactivecustomeraccounts,otherthan VariableCustomerAccounts,thatwereActiveCustomerAccountsinthesamequarteroftheprioryear.TheDollar-BasedNetExpansionRateisthequotient obtainedbydividingtherevenuegeneratedfromthatcohortinaquarter,bytherevenuegeneratedfromthatsamecohortinthecorrespondingquarterintheprior year.whentwiliocalculatesdollar-basednetexpansionrateforperiodslongerthanonequarter,itusestheaverageoftheapplicablequarterlydollar-basednet ExpansionRatesforeachofthequartersinsuchperiod. Source:TwilioInc.

12 TWILIO INC. Consolidated Statements of Operations (In thousands, except share and per share amounts) Three Months Ended December 31, (Unaudited) Revenue $ 115,236 $ 81,952 Costofrevenue 55,022 34,205 Grossprofit 60,214 47,747 Operatingexpenses: Researchanddevelopment 32,829 24,587 Salesandmarketing 27,622 17,816 Generalandadministrative 18,809 14,304 Charitablecontribution 1,172 3,860 Totaloperatingexpenses 80,432 60,567 Lossfromoperations (20,218) (12,820) Otherincome(expenses),net 1, Lossbefore(provision)benefitforincometaxes (19,116) (12,595) (Provision)benefitforincometaxes 197 (13) Netlossattributabletocommonstockholders $ (18,919) $ (12,608) Netlosspershareattributabletocommonstockholders,basicanddiluted $ (0.20) $ (0.15) Weighted-averagesharesusedincomputingnetlosspershareattributabletocommonstockholders,basicanddiluted 93,246,941 86,132,737

13 TWILIO INC. Consolidated Statements of Operations (In thousands, except share and per share amounts) Year Ended December 31, Revenue $ 399,020 $ 277,335 Costofrevenue 182, ,520 Grossprofit 216, ,815 Operatingexpenses: Researchanddevelopment 120,739 77,926 Salesandmarketing 100,669 65,267 Generalandadministrative 59,619 51,077 Charitablecontribution 1,172 3,860 Totaloperatingexpenses 282, ,130 Lossfromoperations (66,074) (41,315) Otherincome(expenses),net 3, Lossbeforeprovisionforincometaxes (63,003) (40,998) Provisionforincometaxes (705) (326) Netlossattributabletocommonstockholders $ (63,708) $ (41,324) Netlosspershareattributabletocommonstockholders,basicanddiluted $ (0.70) $ (0.78) Weighted-averagesharesusedincomputingnetlosspershareattributabletocommonstockholders,basicanddiluted 91,224,607 53,116,675

14 TWILIO INC. Consolidated Balance Sheets (In thousands) As of December 31, Assets Currentassets: Cashandcashequivalents $ 115,286 $ 305,665 Short-termmarketablesecurities 175,587 - Accountsreceivable,net 43,113 26,203 Prepaidexpensesandothercurrentassets 19,279 21,512 Totalcurrentassets 353, ,380 Restrictedcash 5,502 7,445 Propertyandequipment,net 50,541 37,552 Intangibleassets,net 20,064 10,268 Goodwill 17,851 3,565 Otherlong-termassets 2, Totalassets $ 449,782 $ 412,694 Liabilities and Stockholders Equity Currentliabilities: Accountspayable $ 11,116 $ 4,174 Accruedexpensesandothercurrentliabilities 53,614 59,308 Deferredrevenue 13,797 10,222 Totalcurrentliabilities 78,527 73,704 Long-termliabilities 11,409 9,543 Totalliabilities 89,936 83,247 Commitmentsandcontingencies Stockholders equity: Preferredstock - - Commonstock Additionalpaid-incapital 608, ,090 Accumulatedothercomprehensiveincome 2,025 - Accumulateddeficit (250,438) (186,730) Totalstockholders equity 359, ,447 Totalliabilitiesandstockholders equity $ 449,782 $ 412,694

15 TWILIO INC. Consolidated Statements of Cash Flow (In thousands) Year Ended December 31, Operating Activities: Netloss $ (63,708) $ (41,324) Adjustmentstoreconcilenetlosstonetcashprovidedby(usedin) operatingactivities: Depreciationandamortization 18,764 8,315 Amortizationofbondpremium Stock-basedcompensation 49,619 24,225 Valueofcommonstockdonatedtocharity 1,172 - Provisionfordoubtfulaccounts 580 1,145 Write-offofinternallydevelopedsoftware (Gain)lossonleasetermination (295) 94 Changesinassetsandliabilities: Accountsreceivable (15,280) (8,254) Prepaidexpensesandothercurrentassets 2,214 (13,755) Otherlong-termassets (1,989) (135) Accountspayable 5,433 1,714 Accruedexpensesandothercurrentliabilities (3,312) 24,182 Deferredrevenue 3,560 4,076 Long-termliabilities (841) 9,097 Netcashprovidedby(usedin)operatingactivities (3,260) 10,091 Investing Activities: (Increase)decreaseinrestrictedcash 3,118 (7,439) Purchasesofmarketablesecurities (293,186) - Maturitiesofmarketablesecurities 115,877 - Capitalizedsoftwaredevelopmentcosts (17,280) (11,527) Purchasesofpropertyandequipment (9,248) (14,174) Purchasesofintangibleassets (290) (785) Acquisitions,netofcashacquired (22,621) (8,500) Netcashusedininvestingactivities (223,630) (42,425) Financing Activities: Proceedsfrominitialpublicoffering,netofunderwritingdiscounts - 160,426 Proceedsfromfollow-onpublicoffering,netofunderwritingdiscounts - 65,281 Paymentsofcostsrelatedtopublicofferings (430) (4,606) Proceedsfromexercisesofstockoptions 25,627 9,100 ProceedsfromsharesissuedinESPP 11,918 - Valueofequityawardswithheldfortaxliabilities (678) (1,037) Netcashprovidedbyfinancingactivities 36, ,164 Effectofexchangeratechangesoncashandcashequivalents 74 - Netincrease(decrease)incashandcashequivalents (190,379) 196,830 Cashandcashequivalentsatbeginningofyear 305, ,835 Cashandcashequivalentsatendofyear $ 115,286 $ 305,665

16 TWILIO INC. Reconciliation to Non-GAAP Financial Measures (In thousands, except share and per share amounts) Three Months Ended December 31, (Unaudited) Gross profit $ 60,214 $ 47,747 Stock-basedcompensation Amortizationofacquiredintangibles 1, Non-GAAPgrossprofit $ 61,619 $ 48,312 Non-GAAPgrossmargin 53% 59% Research and development $ 32,829 $ 24,587 Stock-basedcompensation (6,121) (5,310) Amortizationofacquiredintangibles (38) (37) Payrolltaxesrelatedtostock-basedcompensation (122) (61) Non-GAAPresearchanddevelopment $ 26,548 $ 19,179 Non-GAAPresearchanddevelopmentas%ofrevenue 23% 23% Sales and marketing $ 27,622 $ 17,816 Stock-basedcompensation (2,861) (1,690) Amortizationofacquiredintangibles (214) - Payrolltaxesrelatedtostock-basedcompensation (100) (169) Non-GAAPsalesandmarketing $ 24,447 $ 15,957 Non-GAAPsalesandmarketingas%ofrevenue 21% 19% General and administrative $ 18,809 $ 14,304 Stock-basedcompensation (4,474) (1,420) Amortizationofacquiredintangibles (20) (27) Acquisitionrelatedexpenses - (362) Releaseoftaxliabilityuponobligationsettlement Payrolltaxesrelatedtostock-basedcompensation (79) (204) Non-GAAPgeneralandadministrative $ 14,520 $ 13,096 Non-GAAPgeneralandadministrativeas%ofrevenue 13% 16% Loss from operations and margin $ (20,218) $ (12,820) Stock-basedcompensation 13,646 8,576 Amortizationofacquiredintangibles 1, Releaseoftaxliabilityuponobligationsettlement (284) (805) Acquisitionrelatedexpenses Payrolltaxesrelatedtostock-basedcompensation Charitablecontribution 1,172 3,860 Non-GAAPincome(loss)fromoperations $ (3,896) $ 80 Non-GAAPoperatingmargin -3% 0% TWILIO INC. Reconciliation to Non-GAAP Financial Measures (In thousands, except share and per share amounts) Three Months Ended December 31, (Unaudited) Net loss attributable to common stockholders $ (18,919) $ (12,608) Stock-basedcompensation 13,646 8,576 Amortizationofacquiredintangibles 1, Releaseoftaxliabilityuponobligationsettlement (284) (805) Acquisitionrelatedexpenses Payrolltaxesrelatedtostock-basedcompensation Charitablecontribution 1,172 3,860 Non-GAAPnetincome(loss)attributabletocommonstockholders $ (2,597) $ 292 Non-GAAPnetincome(loss)attributabletocommonstockholdersas%ofrevenue -2% 0% Net loss per share attributable to common stockholders, basic and diluted* $ (0.20) $ (0.15)

17 Stock-basedcompensation Amortizationofacquiredintangibles Releaseoftaxliabilityuponobligationsettlement (0.00) (0.01) Acquisitionrelatedexpenses Payrolltaxesrelatedtostock-basedcompensation Charitablecontribution Dilutivesecurities Non-GAAPnetincome(loss)pershareattributabletocommonstockholders,diluted $ (0.03) $ 0.00 GAAP weighted-average shares used to compute Non-GAAP net income (loss) per share attributable to common stockholders, basic and diluted 93,246,941 86,132,737 Effect of dilutive securities (stock options and restricted stock units) - 14,073,935 Non-GAAP weighted-average shares used to compute Non-GAAP net income (loss) per share attributable to common stockholders, basic and diluted 93,246, ,206,672 *Somecolumnsmaynotaddduetorounding

18 TWILIO INC. Reconciliation to Non-GAAP Financial Measures (In thousands, except share and per share amounts) Year Ended December 31, (Unaudited) Gross profit $ 216,125 $ 156,815 Stock-basedcompensation Amortizationofacquiredintangibles 4, Non-GAAPgrossprofit $ 221,419 $ 157,725 Non-GAAPgrossmargin 55% 57% Research and development $ 120,739 $ 77,926 Stock-basedcompensation (22,808) (12,946) Amortizationofacquiredintangibles (139) (151) Payrolltaxesrelatedtostock-basedcompensation (1,466) (61) Gainonleasetermination Non-GAAPresearchanddevelopment $ 96,476 $ 64,768 Non-GAAPresearchanddevelopmentas%ofrevenue 24% 23% Sales and marketing $ 100,669 $ 65,267 Stock-basedcompensation (9,822) (4,972) Amortizationofacquiredintangibles (753) - Payrolltaxesrelatedtostock-basedcompensation (714) (169) Gainonleasetermination Non-GAAPsalesandmarketing $ 89,480 $ 60,126 Non-GAAPsalesandmarketingas%ofrevenue 22% 22% General and administrative $ 59,619 $ 51,077 Stock-basedcompensation (16,339) (6,016) Amortizationofacquiredintangibles (84) (110) Acquisitionrelatedexpenses (310) (499) Releaseoftaxliabilityuponobligationsettlement 13, Payrolltaxesrelatedtostock-basedcompensation (770) (204) Gainonleasetermination 45 - Non-GAAPgeneralandadministrative $ 55,526 $ 45,053 Non-GAAPgeneralandadministrativeas%ofrevenue 14% 16% Loss from operations and margin $ (66,074) $ (41,315) Stock-basedcompensation 49,619 24,225 Amortizationofacquiredintangibles 5, Acquisitionrelatedexpenses Releaseoftaxliabilityuponobligationsettlement (13,365) (805) Payrolltaxesrelatedtostock-basedcompensation 2, Gainonleasetermination (295) - Charitablecontribution 1,172 3,860 Non-GAAPlossfromoperations $ (20,063) $ (12,222) Non-GAAPoperatingmargin -5% -4% TWILIO INC. Reconciliation to Non-GAAP Financial Measures (In thousands, except share and per share amounts) Year Ended December 31, (Unaudited) Net loss attributable to common stockholders $ (63,708) $ (41,324) Stock-basedcompensation 49,619 24,225 Amortizationofacquiredintangibles 5, Releaseoftaxliabilityuponobligationsettlement (13,365) (805) Acquisitionrelatedexpenses Payrolltaxesrelatedtostock-basedcompensation 2, Gainonleasetermination (295) - Charitablecontribution 1,172 3,860 Non-GAAPnetlossattributabletocommonstockholders $ (17,697) $ (12,231)

19 Non-GAAPnetlossattributabletocommonstockholdersas%ofrevenue -4% -4% Net loss per share attributable to common stockholders, basic and diluted* $ (0.70) $ (0.78) Stock-basedcompensation Amortizationofacquiredintangibles Releaseoftaxliabilityuponobligationsettlement (0.15) (0.02) Acquisitionrelatedexpenses Payrolltaxesrelatedtostock-basedcompensation Gainonleasetermination (0.00) - Charitablecontribution Convertiblepreferredstock Non-GAAPnetlosspershareattributabletocommonstockholders,diluted $ (0.19) $ (0.16) GAAP weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted 91,224,607 53,116,675 Weighted-average shares of convertible preferred stock issued and outstanding - 25,454,849 Non-GAAP weighted-average shares used to compute Non-GAAP net loss per share attributable to common stockholders, basic and diluted 91,224,607 78,571,524 *Somecolumnsmaynotaddduetorounding

20 TWILIO INC. Key Metrics (Unaudited) Three Months Ended March 31, June 30, Sept. 30, Dec. 31, NumberofActiveCustomers(as of end date of period ) 40,696 43,431 46,489 48,979 BaseRevenue(in thousands) $ 80,643 $ 87,583 $ 91,965 $ 105,299 Base Revenue Growth Rate 62% 55% 43% 40% Dollar-BasedNetExpansionRate 141% 131% 122% 118% CONTACT: TwilioInc. InvestorContact: GregKleiner ir@twilio.com or MediaContact: CaitlinEpstein press@twilio.com