AI training data company AfterQuery has completed a new round of financing, with a valuation of 3.2 billion dollars

According to market news, AI training data startup AfterQuery has completed a new round of financing, with a valuation reaching $3.2 billion. Just five months after completing a $30 million Series A round at a valuation of $300 million in April, the valuation has increased more than tenfold.

According to Y Combinator partner Gustaf Alströmer, this is the fastest startup in YC history to go from founding to becoming a unicorn. The founders of AfterQuery are only 22 and 23 years old and just participated in the YC Winter 2025 batch 18 months ago. The company announced in April that its annualized revenue has reached $100 million, with clients including NVIDIA, Legora, and the South Korean AI lab Motif Technologies. AfterQuery focuses on training models and agents to complete tasks like professionals rather than just ensuring the accuracy of answers.