AfterQuery Hits Unicorn Status as Y Combinator's Fastest Growing Startup

AI training-data startup AfterQuery has reportedly reached a valuation of $3.2 billion, becoming the fastest unicorn in Y Combinator's history.

September 2, 2026, 01:08 AM·1 views

Photo: TechCrunch

AfterQuery, a San Francisco-based startup, focuses on training AI models and agents to emulate professional workflows. Unlike traditional training data providers, the company encodes the patterns, decisions, and reasoning of top practitioners to teach models how to complete tasks like professionals would.

The company's growth trajectory is reported to be the fastest in Y Combinator's history. The founders, currently aged 22 and 23, participated in the Combinator's Winter 2025 cohort just 18 months ago.

Financial performance is strong, as the company announced an annualized revenue run rate of $100 million in April. Its client list includes major AI labs and companies such as Nvidia, Legora, and Motif Technologies from South Korea.