Stripe
Hiring
What they do:
Economic infrastructure for the internet.
Quick facts:
HQ: San Francisco, CA, United States
Y Combinator Summer 2009 Startups
This list has 26 startups and was last updated on Oct 15, 2026. 2 of them are hiring right now. Largest teams: Stripe, Mixpanel, and WePay.
26 startups
What they do:
Mixpanel is event analytics for builders that need answers.
Quick facts:
HQ: San Francisco, CA, United States
What they do:
Olark gives you an AI agent that works your marketing funnel 24/7
Quick facts:
HQ: San Francisco, CA, United States
RentHop
Hiring
What they do:
Apartment rental marketplace
Quick facts:
HQ: New York, NY, United States
What they do:
Mobile marketplace for trading used goods.
Quick facts:
HQ: San Francisco, CA, United States
What they do:
Product recommendations.
Quick facts:
HQ: San Francisco, CA, United States
What they do:
Lingt provided a web-based platform for learning languages leveraging…
Quick facts:
HQ: San Francisco, CA, United States
WePay
Acquired
What they do:
Payments for platform businesses.
Quick facts:
HQ: San Francisco, CA, United States
Bump
Acquired
What they do:
Bump, Flock, Photoroll (unreleased) => Google Photos
Quick facts:
HQ: San Francisco, CA, United States
RethinkDB
Acquired
What they do:
The open source database for the realtime web.
Quick facts:
HQ: San Francisco, CA, United States
Lockitron
Acquired
What they do:
Lockitron makes electronic locks you can control locally from your…
Quick facts:
HQ: San Francisco, CA, United States
DailyBooth
Acquired
What they do:
DailyBooth lets users follow their friends and update them in real-time through the use of pictures and status updates.
Quick facts:
HQ: San Francisco, CA, United States
GraffitiGeo
Acquired
What they do:
We let you know where to go and what to get once you get there.…
Quick facts:
HQ: San Francisco, CA, United States
Flightcaster
Acquired
What they do:
FlightCaster predicts flight delays. FlightCaster can predict your probability of delay hours before the airline or any other app notifies you. FlightCaster…
Quick facts:
HQ: San Francisco, CA, United States
HighlightCam
Shut down
What they do:
HighlightCam edits video, automatically!
Quick facts:
HQ: San Francisco, CA, United States
Jobspice
Shut down
What they do:
JobSpice is a surprisingly easy-to-use, intuitive online tool for creating a resume. Changing styles, managing different resumes for different employers, and…
Quick facts:
HQ: San Francisco, CA, United States
CarWoo
Shut down
What they do:
The best way to buy a new car.
Quick facts:
HQ: San Francisco, CA, United States
Fanchatter
Shut down
What they do:
FanChatter aggregates, amplifies and empowers fan content on every…
Quick facts:
HQ: Minneapolis, MN, United States
Tuxebo
Shut down
What they do:
Online marketplace for equipment rental
Quick facts:
HQ: London, United Kingdom
Plurchase
Shut down
What they do:
Plurchase is an online social shopping site. From it, you can visit online shopping sites like Zappos with the additional of a social toolbar on the right…
Quick facts:
HQ: San Francisco, CA, United States
NudgePad
Shut down
What they do:
Online IDE. We joined Microsoft in 2014.
Quick facts:
HQ: San Francisco, CA, United States
Wakemate
Shut down
What they do:
WakeMate makes personalized alarm clocks that sync with both a user's body and their cell phone, enabling the iPhone alarm system to sound at the end of a REM…
Quick facts:
HQ: San Francisco, CA, United States
Instantq
Shut down
What they do:
InstantQ is an online platform that enables restaurants to distribute JIT promotions to its customers. It was launched in 2009 by Dana Levine and is based in…
Quick facts:
HQ: San Francisco, CA, United States
RoboHR
Shut down
Quick facts:
HQ: San Francisco, CA, United States
YC S09Early stage
AdThrow
Shut down
Quick facts:
YC S09Early stage
Stackq
Shut down
Quick facts:
YC S09Early stage
Questions and answers
How many startups are on this list?
There are 26 startups on this list, last updated on Oct 15, 2026.
Which of them are hiring?
2 of them are hiring right now, including Stripe and RentHop.
Which of them have the largest teams?
By team size: Stripe (7,000 employees), Mixpanel (410 employees), and WePay (400 employees).