Y Combinator (YC), which started operating in March 2005 in the US, is considered the premier technology startup accelerator in the world. Over 4,000 companies, such as Airbnb, Coinbase, Cruise, DoorDash, Dropbox, Instacart, Quora, PagerDuty, Reddit, Stripe, and Twitch, have been launched through this program. As of January 2023, the collective worth of the leading YC firms exceeded $600 billion.