The round was impressive for a couple of reasons: The founders are a pair of 22-year-olds that had set out to build a virtual reality company before pivoting to payments, and they had only completed Y Combinator, a well-known Silicon Valley startup accelerator, the year prior.
Y Combinator is responsible for many successes in the startup world, certainly more than its fellow accelerators, which are all known to provide early-stage companies with a seed investment — in YC’s case, $150,000 — mentorship and educational resources through a short-term program that culminates in a demo day.
Today, YC has released the latest list of its most successful companies since it began backing startups in 2005. Ranked by valuation and/or market cap, Brex, sure enough, is the youngest company to crack the top 20:
- Airbnb: An online travel community and room-sharing platform founded by Brian Chesky, Joe Gebbia and Nathan Blecharczyk. Valuation: $31 billion. YC W2009.
- Stripe: A provider of an online payment processing system for internet businesses founded by John and Patrick Collison. Valuation: $20 billion. YC S2009.
- Cruise: Acquired by GM in 2006, the company is building autonomous vehicles. It was founded by Kyle Vogt and Daniel Kan. Valuation: $14 billion. YC W2014.
- Dropbox: A file hosting service and workplace collaboration platform founded by Drew Houston and Arash Ferdowsi that went public in March. Market cap: >$10 billion. YC S2007.
- Instacart: A grocery and home essentials delivery service founded by Apoorva Mehta, Max Mullen and Brandon Leonardo. Valuation: $7.6 billion. YC S2012.
- Machine Zone: A mobile games company, founded by Mike Sherrill, Gabriel Leydon and Halbert Nakagawa, known for “Game of War.” Valuation: >$5 billion. YC W2008.
- DoorDash: An app-based food delivery service founded by Tony Xu, Stanley Tang and Andy Fang. Valuation: $4 billion. YC S2013.
- Zenefits: The provider of human resources software for small and medium-sized businesses founded by Laks Srini and Parker Conrad. Valuation: $2 billion. YC W2013.
- Gusto: The provider of software that automates and simplifies payroll for businesses, founded by Josh Reeves, Tomer London and Edward Kim. Valuation: $2 billion. YC W2012.
- Reddit: An online platform for conversation and thousands of communities founded by Alexis Ohanian and Steve Huffman. Valuation: $1.8 billion. YC S2005.
- Coinbase: A digital cryptocurrency exchange and wallet platform founded by Brian Armstrong and Fred Ehrsam. Valuation ~$1.6 billion. YC S2012.
- PagerDuty: A digital ops management platform for businesses founded by Baskar Puvanathasan, Andrew Miklas and Alex Solomon. Valuation: $1.3 billion. YC S2012.
- Docker: A platform for applications that gives developers the freedom to build, manage and secure business-critical applications, founded by Solomon Hykes and Sebastien Pahl. Valuation: $1.3 billion. YC S2010.
- Ginkgo Bioworks: A biotech company focused on designing custom microbes founded by Reshma Shetty, Jason Kelly, Barry Canton and others. Valuation: >$1 billion. YC S2014.
- Rappi: A Latin American on-demand delivery startup founded by Felipe Villamarin, Simon Borrero and Sebastian Mejia. Valuation: >$1 billion. YC W2016.
- Brex: A B2B financial startup that provides corporate cards to startups. Its founders include Henrique Dubugras and Pedro Franceschi. Valuation: $1.1 billion. YC W2017.
- GitLab: A developer service founded by Sid Sijbrandij and Dmitriy Zaporozhets that aims to offer a full lifecycle DevOps platform. Valuation: $1.1 billion. YC W2015.
- Twitch: An Amazon-acquired live-streaming platform for video games used by millions. Its founders include Emmett Shear, Justin Kan, Michael Seibel and Kyle Vogt. YC W2007.
- Flexport: A logistics company that moves freight globally by air, ocean, rail and truck founded by Ryan Petersen. Valuation: ~$1 billion. YC W2014.
- Mixpanel: A user analytics platform that helps each person at a business understand its users, founded by Suhail Doshi and Tim Trefren. Valuation: >$865 million. YC S2009.
The full list of Y Combinator’s 100 most successful companies is available here.