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The Y Combinator Mafia

10,686 people came through Y Combinator and went on to found or lead other companies.

Jules TestardYC Summer 2020Founded Piepacker +1 Anson KungYC Summer 2023Founded Flint +1 Ish BaidFounder & CEO | VirtuallyFounded Wayside +1 Christophe BarreAdmission Team: Startup Evaluator & AnalystFounded Tandem +1 David PastewkaYC Summer 2026Founded Marker +1 Martin BorchardtAlumni - Batch S20Founded Henry +1 Manuel Barna FerrésYC Summer 2020Founded Henry +1 Drew WilsonS20Founded Opacity +1 Mohandass KalaichelvanSummer 2020 BatchFounded Veridian +1 Shantanu JoshiYC Winter 2023Founded Lume +1 Michelle KhineYC Summer 2021Founded Makani Science +1 Akash RajuGlimpse - Summer 2020Founded Glimpse +1 Kushal NegiYC Summer 2020Founded Glimpse +1 Arnie EnglanderYC Winter 2024Founded Model ML +1 Ali JiwaniSummer 2020Founded Rally +1 Anson KaoYC Summer 2020Founded Rally +1 Amy LiuYC Winter 2022Founded Rally +1 Ross ChaninYC Summer 2020Founded Reputation Com +1 Benjamin South LeeYC Fall 2024Founded Variant +1 Denis BellavanceS20Founded Peach +1 David KleinYC Summer 2020Founded WEX +1 Johannes JaeckleS20Founded Heron +1 Victor NogueraYC Summer 2020Founded Labsense +1 Jeffrey DietrichYC Summer 2020Founded Rarebird +1 Nicholas DonahueYC Spring 2026Founded Drafted +1 Trent HedgeYC Summer 2020Founded Atmos +1 Matthew RastovacYC Summer 2020Founded Atmos +1 Michael DubrovskyS20Founded SiPhox Health +1 Diedrik VermeulenYC Summer 2020Founded SiPhox Health +1 Nick MacarioYC Summer 2020Founded Remote +1 Wil EyiYC S20Founded Payflow +1 Jonathan SpornS2020Founded Gilgamesh Pharma +1 Andrew KruegelYC Summer 2020Founded Gilgamesh Pharma +1 Juan CasianAlumniFounded Boom AI +1 Gabriel SavitYC Winter 2021Founded Runway +1 Matt VargheseYC Winter 2021Founded Runway +1 Neil S W MurrayW21Founded Mimecast +1 Jacqueline SamiraW21Founded Howdy.com +1 Joseph MetzingerYC Winter 2021Founded Mozio +1 Georgy MelkonyanYC Winter 2021Founded Vizit +1 Alex DixonW21Founded Monograph +1 Abhishek GuptaYC Winter 2021Founded Circles Life +1 Phillippe SiclaitYC Winter 2021Founded Clay +1 Sebastien SiclaitYC Winter 2021Founded Clay +1 Vivek KumarW21Founded PrimeVault +1 Roger CawdetteYC Summer 2024Founded Village Labs +1 Jared HansonYC Winter 2021Founded Keycard +1 Mark MilastsivyYC Winter 2021Founded Rodeo +1 Tiffany WongW21Founded Pry Financials +1 Sandy SuhYC Winter 2021Founded Worldly +1 Jordan DearsleyW21 BatchFounded Superpowered +1 Richard WhiteYC Winter 2021Founded Uservoice +1 Benjamin CrocYC W21Founded BrioHR +1 Roger TeranW21Founded Techstars +1 Jun Yuan TanYC W'21Founded Homebase +1 Nick OrnitzYC Winter 2021Founded Dwelling +1 Shannon KayProPhone | YC W21Founded Dwelling +1 Griffin MorrisYC Winter 2021Founded Spatial +1 Vivek PrakashYC Winter 2021Founded Hackerearth +1 Daryl SewYC Winter 2021Founded Certainly Health +1 Sriharsha KaramchatiYC Winter 2021Founded Questbook +1 Aakhil FardeenYC Winter 2021Founded Lish +1 Mark PiperW21Founded Lish +1 Ivan TsarynnyYC Winter 2021Founded PostBeyond +1 Aravindh DoraiYC Winter 2021Founded Bevel +1 Nurlybek MursaliyevYC Winter 2021Founded Smartlens +1 Julian ColinaYC Winter 2021Founded HaystackAnalytics +1 Abdulhamid HassanYC Winter 2021Founded Mono +1 Bart RoszkowskiNot a formal education / W21 batch / Vue StorefrontFounded Alokai +1 Kiril VidelovYC Winter 2021Founded Codeball +1 Sojan JoseW17Founded Chatwoot +1 Anuj SaigalCo-founder of DataheraldFounded Spark +1 Thomas MargeW21Founded Rewbi +1 Shubham BansalYC Winter 2021Founded Changeengine +1 Andrew DolinskiW21Founded Clutch +1 Mostafa AshourYC Winter 2021Founded NowPay +1 Ahmed AbuelenienYC Winter 2021Founded NowPay +1 Paul HetheringtonYC Winter 2021Founded Hlabs +1 Giulio CantoroW21Founded Blink +1 Jacopo BerlusconiW21Founded Blink +1 Marco BorettoW21Founded Blink +1 Marco TurettaW21Founded Blink +1 Tomas MoškaYC Winter 2021Founded Turing School +1 Moustafa MahmoudW21Founded Cognitev +1 Max MednikYC Summer 2021Founded Epsilon3 +1 Danilo Stern-SapadYC Summer 2021Founded Blixo +1 Colton DillionS21Founded Quip Network +1 Christian MischlerYC Summer 2021Founded guest ready +1 Jeff Wilson aka Professor DumpsterS21Founded No Cap +1 Vladimir KorshinS21 & S24Founded PathPilot +1 Asa SchacharS21Founded Voicepanel +1 Quentin RousseauYC Summer 2019Founded Rootly +1 Kiiru MuhoyaYC Summer 2021Founded Fingo Holdings +1 Bhairav MehtaYC Spring 2026Founded CharacterQuilt +1 Cathy HanYC Summer 2021Founded 42 +1 Jagveer GandhiYC S21Founded Game State Labs +1

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Frequently asked questions

What is the Y Combinator mafia?: The Y Combinator mafia is the network of 10,686 people who came through Y Combinator and went on to found or lead other companies, including Piepacker, Flint, Wayside, Tandem, Marker.
Who is in the Y Combinator mafia?: Notable members include Jules Testard (Piepacker), Anson Kung (Flint), Ish Baid (Wayside), Christophe Barre (Tandem), David Pastewka (Marker), Martin Borchardt (Henry), Manuel Barna Ferrés (Henry), Drew Wilson (Opacity), among 10,686 tracked members.
What companies did Y Combinator alumni found?: Companies founded by Y Combinator alumni include Piepacker, Flint, Wayside, Tandem, Marker, Henry, Opacity, Veridian, Lume, Makani Science.