AfterQuery, an AI training data startup, reached a $3.2 billion valuation just 20 months after its founding, making it the fastest company in Y Combinator’s history to achieve unicorn status. The company closed a $30 million Series A in April 2026 at a $300 million valuation, then multiplied that value more than tenfold in five months. AfterQuery provides human-curated datasets from approximately 100,000 verified professionals in finance, medicine, law, and software engineering to leading AI labs including OpenAI, Google DeepMind, Microsoft AI, and Nvidia. The startup reported over $100 million in annual recurring revenue in April 2026, which grew to hundreds of millions by July, demonstrating extraordinary rapid growth.
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