Who is in the Y Combinator mafia?

Notable members include Sam Altman (Tools for Humanity), Jessica Livingston (Y Combinator), Alexis Ohanian (Reddit), Fred Ehrsam (Nudge), Matt Huang (Hotspots), Trae Stephens (Pursuit), Delian Asparouhov (Nightingale), Michael Seibel (SocialCam), among 8,773 tracked members.

What companies did Y Combinator alumni found?

Companies founded by Y Combinator alumni include Tools for Humanity, Y Combinator, Reddit, Nudge, Hotspots, Pursuit, Nightingale, SocialCam, Standardcap, Dropbox.

The Y Combinator Mafia

8,773 people came through Y Combinator and went on to found or lead other companies.

Sam AltmanPresidentFounded Tools for Humanity +3 Jessica LivingstonCo-founderFounded Y Combinator Alexis OhanianYC Summer 2005Founded Reddit Fred EhrsamYC Summer 2012Founded Nudge +1 Matt HuangYC Winter 2011Founded Hotspots Trae StephensYC Winter 2022Founded Pursuit +1 Delian AsparouhovYC Summer 2014Founded Nightingale +1 Michael SeibelPartner EmeritusFounded SocialCam Paul BuchheitGroup PartnerFounded Standardcap Dalton CaldwellManaging Director & Group PartnerFounded Standardcap Drew HoustonYC Summer 2007Founded Dropbox +1 Arash FerdowsiYC Summer 2007Founded Dropbox Ben SilbermannYC Winter 2006Founded 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 Stripe Brian ArmstrongYC Summer 2012Founded Coinbase +1 Alexandr WangYC Summer 2016Founded Scale AI +1 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 DoshiYC Summer 2019Founded Playground +1 Parker ConradYC Winter 2013Founded Zenefits +1 Prasanna SankarYC Winter 2017Founded 0xPPL +1 Mathilde CollinYC Summer 2014Founded Front +1 Gergely NemethYC Summer 2013Founded DoorDash Subomi OluwalanaYC Winter 2022Founded Convoy Justin KanYC Winter 2007Founded Stash +6 Bill GrossYC Winter 2022Founded X1 +5 Kelly SmithYC Summer 2012Founded Pitform +3 Darius "Bubs" MonsefYC Summer 2024Founded Sightbox +3 Scott Wolf, MDYC Winter 2017Founded Cardiac Dimensions +3 Matthew ScholzYC Winter 2017Founded Oisin Biotechnologies +3 Matt RouifYC Summer 2020Founded Photoroom +3 Harry GrunerYC Summer 2020Founded Hilos +2 Oleg RogynskyyYC Summer 2016Founded UFORCE Acquired +2 Magnus HambletonYC Summer 2020Founded Founders Pledge +2 IanYC Winter 2014Founded Immunity Project +2 Guillaume LuccisanoYC Summer 2015Founded Yuma AI +2 Danielle MorrillYC Summer 2012Founded Firstparty Labs +2 André AlbergariaYC Winter 2019Founded Advesya +2 Ivan ZhouYC Winter 2018Founded Decagon +2 Geoffrey WooYC Summer 2011Founded Ketone-IQ +2 Kanjun QiuYC Summer 2017Founded Kanjun +2 Immad AkhundYC Summer 2007Founded Clickpass +2 Kyle VogtYC Winter 2007Founded Twitch +2 Merrill LutskyYC Winter 2013Founded Graphite +2 Eric WuYC Winter 2010Founded Brain Co. +2 Dan SirokerYC Winter 2010Founded Limitless +2 Daniel KanYC Winter 2012Founded Exec +2 Emmett ShearYC Winter 2007Founded Softmax +2 Gordon WintrobYC Winter 2014Founded Newfrontinsurance +2 Brandon PatonYC Winter 2012Founded Glider +2 Dave NewmanYC Winter 2012Founded Howie +2 Amir GhazvinianYC Fall 2025Founded Interstate Analytics +2 Khaled HusseinYC Winter 2012Founded Tilt +2 Geoff SchmidtYC Summer 2011Founded Meteor Development Group +2 Sean GroveYC Summer 2018Founded Linzumi +2 Andrew LeeYC Summer 2011Founded Tasklet +2 Yin WuYC Summer 2013Founded Pulley +2 Andrew LevyYC Summer 2009Founded Apteligent +2 Weiting LiuYC Summer 2012Founded Everyday.me +2 Russ d'SaYC Summer 2007Founded Meetyu +2 Harish AgarwalYC Winter 2007Founded Nori +2 Gautam JayaramanYC Summer 2021Founded Onsite Pro +2 Steve HuffmanYC Summer 2011Founded Aisle50 +2 Ritik MalhotraYC Winter 2019Founded Savvy +2 John CooganYC Summer 2012Founded TBPN +2 João de PaulaYC Spring 2025Founded Mesmer +2 Jon Miller SchwartzYC Summer 2024Founded Ultra +2 Max FriefeldYC Summer 2013Founded Ultra +2 Michael WitzYC Summer 2014Founded Mob Science +2 Val AgostinoYC Winter 2015Founded Monarch +2 Dillon ErbYC Winter 2015Founded Paperspace +2 James SteinbergYC Winter 2017Founded OpenShelf +2 Bharat KilaruYC Summer 2021Founded Verano Health +2 Sebastian MejiaYC Winter 2016Founded Rappi +2 Michael DAngeloYC Winter 2017Founded Matroid +2 Jeremy HindleYC Summer 2017Founded Custodian +2 Dmitry StarodubtsevYC Winter 2023Founded Creopop +2 Aziz AlghunaimYC Winter 2018Founded Nash +2 Mikhail KokorichYC Winter 2021Founded Destinus +2 Gatumi AliyuYC Winter 2021Founded Stack Diagnostics +2 Richard WhiteYC Winter 2021Founded Uservoice +2 Sriharsha KaramchatiYC Winter 2021Founded Questbook +2 Sam YangYC Winter 2021Founded Nova AI Software +2 Ian JanickiYC Winter 2020Founded Outfit +2

+ 8,677 more

Frequently asked questions

What is the Y Combinator mafia?: The Y Combinator mafia is the network of 8,773 people who came through Y Combinator and went on to found or lead other companies, including Tools for Humanity, Y Combinator, Reddit, Nudge, Hotspots.
Who is in the Y Combinator mafia?: Notable members include Sam Altman (Tools for Humanity), Jessica Livingston (Y Combinator), Alexis Ohanian (Reddit), Fred Ehrsam (Nudge), Matt Huang (Hotspots), Trae Stephens (Pursuit), Delian Asparouhov (Nightingale), Michael Seibel (SocialCam), among 8,773 tracked members.
What companies did Y Combinator alumni found?: Companies founded by Y Combinator alumni include Tools for Humanity, Y Combinator, Reddit, Nudge, Hotspots, Pursuit, Nightingale, SocialCam, Standardcap, Dropbox.