AfterQuery Reportedly Hits $3.2B as Y Combinator’s Fastest Unicorn
AfterQuery reportedly hit a $3.2 billion valuation, up more than 10x since April, making it Y Combinator's fastest startup to reach unicorn status ever.
Summary
AI training-data startup AfterQuery reportedly raised a new round valuing it at $3.2 billion on September 1, 2026. The undisclosed financing follows its $30 million Series A at a $300 million valuation in April, marking a more than 10x increase in five months. Y Combinator partner Gustaf Alströmer called it the accelerator’s fastest journey from launch to unicorn status. AfterQuery’s founders, now 22 and 23, attended Y Combinator’s Winter 2025 cohort 18 months ago.
The San Francisco company said in April that it had reached a $100 million annualized revenue run rate and worked with major labs, naming Nvidia, Legora and Korean AI lab Motif Technologies as customers. Like Mercor and Scale, AfterQuery employs doctors, lawyers and other specialists for model training, but focuses on teaching models and agents to complete professional tasks by reproducing expert patterns, decisions and reasoning, rather than checking answer accuracy. The new round’s size and investors remain undisclosed, and AfterQuery did not immediately comment.
Positives
- $3.2 billion reported valuation makes AfterQuery Y Combinator’s fastest startup to progress from launch to unicorn status.
- $100 million annualized revenue run rate was reached by April, according to AfterQuery.
- Nvidia, Legora and Korean AI lab Motif Technologies are named AfterQuery customers.
- Doctors, lawyers and other specialists train models and agents to replicate professional task execution, decisions and reasoning.
- $30 million Series A in April preceded a more than 10x valuation increase within five months.
Risks & concerns
- $3.2 billion valuation remains reported rather than confirmed by AfterQuery.
- The new financing round’s size and participating investors were not disclosed.
- Nvidia, Legora and Motif Technologies are the only named customers despite AfterQuery’s broader claim of working with major labs.