Who is in the Y Combinator mafia?

Notable members include Sam Altman (Tools for Humanity), Garry Tan (Y Combinator), Jessica Livingston (Y Combinator), Alexis Ohanian (Reddit), Fred Ehrsam (Nudge), Matt Huang (Paradigm), Delian Asparouhov (Nightingale), Michael Seibel (Michael Seibel), among 10,454 tracked members.

What companies did Y Combinator alumni found?

Companies founded by Y Combinator alumni include Tools for Humanity, Y Combinator, Reddit, Nudge, Paradigm, Nightingale, Michael Seibel, Standardcap, Dropbox, Audiobeta.

The Y Combinator Mafia

10,454 people came through Y Combinator and went on to found or lead other companies.

Sam AltmanPresidentFounded Tools for Humanity +3 Garry TanPresident & CEOFounded Y Combinator +1 Jessica LivingstonCo-founderFounded Y Combinator Alexis OhanianPartnerFounded Reddit Fred EhrsamYC Summer 2012Founded Nudge +1 Matt HuangYC Winter 2011Founded Paradigm +1 Delian AsparouhovYC Summer 2014Founded Nightingale +1 Michael SeibelPartner EmeritusFounded Michael Seibel +1 Paul BuchheitGroup PartnerFounded Standardcap Dalton CaldwellManaging Director & Group PartnerFounded Standardcap Drew HoustonYC Summer 2007Founded Dropbox +1 Arash FerdowsiYC Summer 2007Founded Dropbox Ben SilbermannYC Winter 2008Founded Audiobeta +2 Brian CheskyYC Winter 2009Founded Airbnb +1 Joe GebbiaYC Winter 2009Founded Airbnb Nathan BlecharczykYC Winter 2009Founded Airbnb Tony XuYC Summer 2013Founded DoorDash +1 Andy FangYC Summer 2013Founded DoorDash Stanley TangYC Summer 2013Founded DoorDash Apoorva MehtaYC Summer 2012Founded Instacart Patrick CollisonYC Winter 2007Founded Stripe +2 John CollisonYC Summer 2009Founded Stripe Brian ArmstrongYC Summer 2012Founded Coinbase +1 Ryan SheaEntrepreneurshipFounded Stacks Open-source network 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 Flexport Suhail DoshiEating beans & riceFounded Playground +1 Parker ConradYC Winter 2017Founded Zenefits +1 Prasanna SankarYC Winter 2017Founded 0xPPL +1 Mathilde CollinVisiting PartnerFounded Front Gergely NemethYC Summer 2013Founded DoorDash Subomi OluwalanaW22Founded Convoy Gleb ChuvpiloAdvisorFounded Thor Directed Energy +6 Justin KanPartnerFounded Stash +5 Bill GrossYC Winter 2022Founded X1 +5 George ChurchYC Summer 2022Founded Editas Medicine +5 Euwyn PoonYC Winter 2015Founded Orbital +4 IanYC Winter 2014Founded Apex Technology +3 Iyinoluwa AboyejiYC Summer 2016Founded Itana +3 Kelly SmithYC Summer 2012Founded Pitform +3 Kyle VogtYC Winter 2007Founded GM Cruise Holdings +3 Daniel KanYC Fall 2025Founded GM Cruise Holdings +3 Mehul ShahYC Winter 2010Founded blueshift +3 Darius "Bubs" MonsefW10Founded Sightbox +3 Russ d'SaSummerFounded LiveKit +3 John CooganYC Summer 2012Founded TBPN +3 Max FriefeldNAFounded Ultra Robotics +3 Scott Wolf, MDYC Winter 2017Founded Cardiac Dimensions +3 Matthew ScholzYC Winter 2017Founded Oisin Biotechnologies +3 Matt RouifYC Summer 2020Founded Photoroom +3 Dino Di CarloYC Winter 2021Founded Partillion +3 Alex HaroYC Winter 2022Founded MoneyKarma +3 Montana LowStartupsFounded Tomo +3 John SunYC Summer 2011Founded Spring Labs Holdings +3 Giovanni ColellaYC Summer 2022Founded Ooda Health +3 Jim BentonYC Winter 2016Founded Adapt +3 Immad AkhundPart-time PartnerFounded Mercury Technologies, Inc. +3 Tom BlomfieldGeneral PartnerFounded Starling Bank +2 Uri LopatinExpert - BioFounded Assemblybio +2 Josh BuckleyMino Games (YC W11)Founded Mino Games +2 Kevin LinYC Winter 2007Founded Lifelikecap +2 Oleg RogynskyyEntrepreneurship/Entrepreneurial StudiesFounded UFORCE Acquired +2 Magnus HambletonYC Summer 2020Founded Founders Pledge +2 Guillaume LuccisanoDid Y Combinator 3 timesFounded Yuma AI +2 Danielle MorrillYC Summer 2012Founded Firstparty Labs +2 Edward LandoYC Summer 2014Founded Link +2 Eric RiesYC Summer 2017Founded LTSE Group +2 André AlbergariaYC Winter 2023Founded Advesya +2 Ivan ZhouYC Winter 2018Founded Decagon +2 Geoffrey WooYC Summer 2011Founded Ketone-IQ +2 Kanjun QiuYC Summer 2017Founded Kanjun +2 Sujay JaswaYC Summer 2007Founded Superunlimited +2 Ryan JuneePart-Time PartnerFounded Ostro +2 Agustin FeuerhakeYCS18Founded Platanus +2 Merrill LutskyYC Winter 2013Founded Graphite +2 Eric WuYC Winter 2010Founded Brain Co. +2 Dan SirokerYC Winter 2010Founded Limitless +2 Emmett ShearPart-time PartnerFounded Softmax +2 Gordon WintrobYC Winter 2018Founded Newfrontinsurance +2 Edward KimYC Winter 2012Founded ZenPayroll +2 Ajay MehtaW12Founded Tolan AI companion +2 Brandon PatonYC Winter 2012Founded Glider +2 Dave NewmanYC Winter 2012Founded Howie +2 Amir GhazvinianYC Winter 2012Founded Interstate Analytics +2 Khaled HusseinTilt (W12)Founded Tilt +2 Drew DurbinYC Winter 2012Founded Wave Mobile Money Holdings +2 Geoff SchmidtYC Summer 2011Founded Meteor Development Group +2 Sean GroveYC Summer 2018Founded Linzumi +2 Andrew LeeYC Spring 2026Founded Tasklet +2 Yin WuYC Summer 2013Founded Pulley +2 Darren NixS11 and S15Founded Steadily +2

+ 10,358 more

Frequently asked questions

What is the Y Combinator mafia?: The Y Combinator mafia is the network of 10,454 people who came through Y Combinator and went on to found or lead other companies, including Tools for Humanity, Y Combinator, Reddit, Nudge, Paradigm.
Who is in the Y Combinator mafia?: Notable members include Sam Altman (Tools for Humanity), Garry Tan (Y Combinator), Jessica Livingston (Y Combinator), Alexis Ohanian (Reddit), Fred Ehrsam (Nudge), Matt Huang (Paradigm), Delian Asparouhov (Nightingale), Michael Seibel (Michael Seibel), among 10,454 tracked members.
What companies did Y Combinator alumni found?: Companies founded by Y Combinator alumni include Tools for Humanity, Y Combinator, Reddit, Nudge, Paradigm, Nightingale, Michael Seibel, Standardcap, Dropbox, Audiobeta.