Who is in the Y Combinator mafia?

Notable members include Sam Altman (Tools for Humanity), Garry Tan (Posterous), Jessica Livingston (Y Combinator), Alexis Ohanian (The Offseason), Fred Ehrsam (Nudge), Matt Huang (Avarra Enterprise Avatar and AI-simulation), Trae Stephens (Pursuit), Delian Asparouhov (Nightingale), among 10,686 tracked members.

What companies did Y Combinator alumni found?

Companies founded by Y Combinator alumni include Tools for Humanity, Posterous, Y Combinator, The Offseason, Nudge, Avarra Enterprise Avatar and AI-simulation, Pursuit, Nightingale, Michael Seibel, Standard Capital.

The Y Combinator Mafia

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

Sam AltmanPresidentFounded Tools for Humanity +3 Garry TanPresident and CEOFounded Posterous +2 Jessica LivingstonFounder, RetiredFounded Y Combinator Alexis OhanianPartnerFounded The Offseason +2 Fred EhrsamYC Summer 2012Founded Nudge +1 Matt HuangYC Winter 2011Founded Avarra Enterprise Avatar and AI-simulation +3 Trae StephensYC Winter 2022Founded Pursuit +1 Delian AsparouhovYC Summer 2014Founded Nightingale +1 Michael SeibelPartner EmeritusFounded Michael Seibel +1 Paul BuchheitGroup PartnerFounded Standard Capital Dalton CaldwellManaging Director & Group PartnerFounded Standard Capital Drew HoustonYC Summer 2007Founded Dropbox +1 Arash FerdowsiYC Summer 2007Founded Dropbox Ben SilbermannYC Winter 2008Founded Audiobeta +2 Brian CheskyYC Winter 2009Founded Airbnb Joe GebbiaYC Winter 2009Founded Airbnb Nathan BlecharczykYC Winter 2009Founded Airbnb Tony XuYC Summer 2013Founded DoorDash Andy FangYC Summer 2013Founded DoorDash Stanley TangYC Summer 2013Founded DoorDash Apoorva MehtaYC Summer 2012Founded Instacart Patrick CollisonYC Summer 2009Founded Auctomatic +1 John CollisonYC Summer 2009Founded Auctomatic +1 Brian ArmstrongYC Summer 2012Founded Coinbase +1 Ryan SheaEntrepreneurshipFounded Stacks Alexandr WangYC Summer 2016Founded Scale AI Lucy GuoYC Summer 2016Founded Passes +1 Amjad MasadYC Winter 2018Founded Replit Henrique DubugrasYC Winter 2017Founded Stone +1 Pedro FranceschiYC Winter 2017Founded Brex Tarek MansourYC Winter 2019Founded Kalshi Ryan PetersenYC Winter 2014Founded Deliverr +1 Suhail DoshiStarting a company (again)Founded Playground +1 Parker ConradYC Winter 2017Founded Zenefits +1 Prasanna SankarYC Winter 2017Founded 0xPPL +1 Mathilde CollinVisiting PartnerFounded Front Subomi OluwalanaW22Founded Convoy Ivan ZhangYC Summer 2024Founded Pinnacle +1 Gleb ChuvpiloAdvisorFounded Thordynamics +7 Justin KanPartnerFounded Stash +6 Bill GrossYC Winter 2022Founded Idealab +6 Andrew NgYC Winter 2015Founded Factored +6 George ChurchYC Summer 2022Founded Editas Medicine +5 Ian CinnamonYC Winter 2014Founded Synapse Technology Corporation +4 Euwyn PoonYC Summer 2010Founded Orbital +4 Marc LoreYC Winter 2018Founded Jet.com +4 Aaron KemmerYC Winter 2015Founded Edge Aerospace +4 Oliver TakachYC Summer 2015Founded Keep +4 Edward LandoYC Summer 2014Founded Link +3 Iyinoluwa AboyejiYC Summer 2016Founded Itana +3 Kelly SmithYC Summer 2012Founded Pitform +3 Geoffrey WooYC Summer 2011Founded Geoff Woo +3 Ryan JuneePart-Time PartnerFounded Ostro +3 Eric WuYC Winter 2010Founded NavigateAI +3 Khaled HusseinTilt (W12)Founded Tilt +3 Darren NixS11 and S15Founded Steadily +3 Adam GoldsteinVisiting PartnerFounded TeachShare +3 Darius "Bubs" MonsefW10Founded Sightbox +3 Harish AgarwalYC Winter 2007Founded Nori +3 John CooganYC Winter 2018Founded TBPN +3 John WangYC Winter 2014Founded Dashbase +3 Brian MaSummer 2014Founded Weaveos +3 Scott WolfYC Winter 2017Founded Cardiac Dimensions +3 Matthew ScholzYC Winter 2017Founded Oncosenx +3 Andy LeeS19 FounderFounded Crescendo +3 Michael WangDoing things that don't scaleFounded Prodigy Research +3 Dino Di CarloYC Winter 2021Founded Partillion +3 Eric WangS21Founded Kips Health +3 Jay PatelYC Winter 2016Founded Margin +3 Saurabh GuptaYC Winter 2019Founded Verismart +3 Eric RowellS25Founded Y Combinator +3 Nam NguyenX25Founded Cohesive +3 Luigi CharlesYC Winter 2022Founded Spherepay +3 James SmithP26Founded Hessian +3 Ryan SmithYC Winter 2014Founded Mura +3 Montana LowStartupsFounded tomo +3 Fred TurnerYC Summer 2016Founded TL Biolabs +3 Kevin WangYC Summer 2012Founded Tokenless +3 Naveen JainYC Winter 2014Founded Intelius +3 Giovanni ColellaYC Summer 2022Founded Ooda Health +3 Jim BentonYC Winter 2016Founded Adapt +3 Tom BlomfieldGeneral PartnerFounded Starling Bank +2 Uri LopatinVisiting PartnerFounded Assembly Biosciences +2 Josh BuckleyMino Games (YC W11)Founded Mino Games +2 Bill ClericoPart-time PartnerFounded Seneca +2 Parth ChopraW20Founded Kinro +2 Aaron MandellYC Summer 2017Founded Quaise Energy +2 Kevin LinYC Winter 2007Founded Lifelikecap +2 Oleg RogynskyyEntrepreneurship/Entrepreneurial StudiesFounded Backstory +2 Michael MaW11Founded Liquid Ventures +2 Magnus HambletonYC Summer 2020Founded Founders Pledge +2 Stefano BernardiYC Winter 2015Founded Unruly Capital +2 Guillaume LuccisanoDid Y Combinator 3 timesFounded Yuma AI +2 Danielle MorrillYC Summer 2012Founded Firstparty Labs +2 André AlbergariaYC Winter 2019Founded Advesya +2

+ 10,591 more →

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 Tools for Humanity, Posterous, Y Combinator, The Offseason, Nudge.
Who is in the Y Combinator mafia?: Notable members include Sam Altman (Tools for Humanity), Garry Tan (Posterous), Jessica Livingston (Y Combinator), Alexis Ohanian (The Offseason), Fred Ehrsam (Nudge), Matt Huang (Avarra Enterprise Avatar and AI-simulation), Trae Stephens (Pursuit), Delian Asparouhov (Nightingale), among 10,686 tracked members.
What companies did Y Combinator alumni found?: Companies founded by Y Combinator alumni include Tools for Humanity, Posterous, Y Combinator, The Offseason, Nudge, Avarra Enterprise Avatar and AI-simulation, Pursuit, Nightingale, Michael Seibel, Standard Capital.