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Y Combinator
Y Combinator turns builders into formidable founders, backing startups like Airbnb, OpenAI, and Stripe.
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Y Combinator is a startup accelerator and venture firm that has funded over 4,000 companies since 2005, including Airbnb, Stripe, Coinbase, DoorDash, and Reddit. Its alumni companies have a combined valuation of $1.3 trillion. YC runs funding batches twice a year, providing seed capital, guidance, and a network of founders and partners to help early-stage startups grow. The internal team builds the software that runs YC, including tools for partners and founders, public products for the startup ecosystem, and AI-powered systems. This is a small team shipping real products to real users frequently.