Y Combinator

Y Combinator is an American technology startup accelerator launched in March 2005. It has been used to launch more than 3,000 companies, including Stripe, Airbnb, Cruise, PagerDuty, Coinbase, Dropbox, and Reddit. The combined valuation of the top YC companies was more than $300 billion by January 2021. The company's accelerator program started in Boston and Mountain View, relocated to San Francisco in 2019. Forbes characterized the company in 2012 as one of the most successful startup accelerators in Silicon Valley.