The following notable startups have completed the Y Combinator Accelerator program.
Mike Isaac described Y Combinator as: "Y Combinator accepts batches of start-ups twice a year in a semester-like system and gives them money, advice and access to a vast network of start-up founders and technologists who can advise them."
2005−2006
Clustrix
Loopt
OMGPop
Scribd
Xobni
YouOS
2007–2008
280 North
AppJet
Biographicon
Disqus
Dropbox
Heroku
Justin.tv
Ninite
Octopart
Parakey
Posterous
Songkick
Virtualmin
Weebly
2009−2010
1000Memories
Airbnb
Bump
Homejoy
Listia
Mixpanel
Optimizely
OwnLocal
PagerDuty
Recurse Center (Hacker School) RethinkDB Stripe WakeMate WePay
2011
Circle
Codecademy
drchrono
Firebase
HackerRank
Humble Bundle
Lanyrd
LeadGenius
MemSQL
Meteor
MongoHQ
OrderAhead
Parse
Pebble (watch) Quartzy Science Exchange Upverter Verbling Vidyard ZeroCater
2012
9GAG
Boosted
BufferBox
Canopy Labs
Coinbase
Diaspora
Double Robotics
Exec
Fullstack Academy
Gusto
Hackpad
Instacart
Kamcord
LendUp
LightTable
PlanGrid
Socialcam
Survata
Swiftype
The Muse (The Daily Muse) Tilt.com Zapier
2013
7 Cups
Airware
Bitnami
Container Linux (CoreOS Linux) CrowdMed DoorDash Experiment Goldbelly Strikingly Teespring True Link Watsi Webflow Zenefits
2014–2015
80,000 Hours
AirPair
Algolia
Bluesmart
Cofactor Genomics
Flexport
Gigster
GitLab
Kickback
Lumi
Move Loot
Paribus
Platzi
Product Hunt
Quora
Rigetti Computing
uBiome
Unbabel
Zesty
Zidisha
2016−2018
Boom Technology
Brex
Coub
LendEDU
Modal Commerce (Drive Motors) Netomi (msg.ai) Rappi Replit Women Who Code