AI training-data startup AfterQuery valued at $3.2B five months after $30M Series A

AI training-data startup AfterQuery raised a round that valued it at $3.2 billion, according to a report by Forbes cited by TechCrunch. This valuation was achieved just five months after the company announced a $30 million Series A at a $300 million valuation in April.

AfterQuery’s founders, aged 22 and 23, attended Y Combinator’s Winter 2025 cohort, 18 months before the reported valuation. Y Combinator partner Gustaf Alströmer described the progression as the fastest path to unicorn status in the accelerator’s history.

The company reported an annualized revenue run rate of $100 million as of April and said it was working with major AI labs. Named customers include Nvidia, Legora, and the Korean AI lab Motif Technologies.

AfterQuery focuses on training models and agents to emulate the patterns, decisions, and reasoning of professionals such as doctors and lawyers, positioning itself in a niche distinct from firms that emphasize factual accuracy in model responses.