AfterQuery reportedly hits $3.2B valuation, fastest unicorn in Y Combinator history

September 2, 2026 at 03:08 AM2 min

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AI training-data startup AfterQuery has reportedly raised a round valuing it at $3.2 billion. Y Combinator partner Gustaf Alströmer said it is the fastest startup to reach unicorn status in the accelerator's history. The valuation comes five months after a $30 million Series A at a $300 million valuation.

Key Facts

AfterQuery's reported $3.2 billion valuation is more than a 10x increase from its $300 million valuation in April.
The startup announced a $30 million Series A at a $300 million valuation in April.
AfterQuery's founders, now 22 and 23 years old, attended Y Combinator's Winter 2025 cohort 18 months ago.
In April, AfterQuery said it had reached an annualized revenue run rate of $100 million.
AfterQuery has named Nvidia, Legora, and Motif Technologies as customers.

Valuation Surge

AfterQuery has reportedly raised a round that valued it at $3.2 billion. This comes five months after announcing a $30 million Series A at a $300 million valuation in April. The increase represents more than a 10x jump in less than half a year. Y Combinator partner Gustaf Alströmer said it is the fastest any startup has gone from launch to unicorn status in the accelerator's history.

Company Background

AfterQuery's founders, today 22 and 23 years old, attended Y Combinator's Winter 2025 cohort, just 18 months ago. In April, the San Francisco startup said it had reached an annualized revenue run rate of $100 million. It has named companies including Nvidia, Legora, and the Korean AI lab Motif Technologies as customers. AfterQuery trains models and agents on how to work like professionals to complete tasks, rather than ensuring accurate answers.

Market Position

AfterQuery is among a new crop of startups following in the footsteps of Mercor and Scale that employ knowledge professionals like doctors and lawyers for model training. The company describes its approach as encoding the patterns, decisions, and reasoning of the world's best practitioners. Forbes first reported on the round. AfterQuery could not be immediately reached for comment.