AfterQuery
Funding History
| Series A · 04/2026 | $300M |
|---|---|
| Reported Valuation Round (lead investor and amount raised not publicly disclosed) · 09/2026 | $3.2B |
About
AfterQuery is a San Francisco-based applied research lab, founded in early 2025, that builds training datasets and reinforcement-learning environments capturing how domain experts such as doctors, lawyers, software engineers, and finance professionals reason through complex tasks. The company supplies this expert-generated data to frontier AI labs building foundation models, positioning itself around the idea that better model performance now depends on higher-quality human reasoning data rather than simply more raw data.
- CEO
- Spencer Mateega
- Headquarters
- San Francisco, CA
- Founded
- 2025
- Website
- https://afterquery.com
Overview
AfterQuery is a San Francisco-based applied research lab, founded in early 2025, that builds training datasets and reinforcement-learning environments capturing how domain experts such as doctors, lawyers, software engineers, and finance professionals reason through complex tasks. The company supplies this expert-generated data to frontier AI labs building foundation models, positioning itself around the idea that better model performance now depends on higher-quality human reasoning data rather than simply more raw data.
Co-founded by CEO Spencer Mateega and CTO Carlos Georgescu, both in their early twenties, AfterQuery grew out of Y Combinator's Winter 2025 batch and reported annualized revenue above $100 million by April 2026, with customers including NVIDIA and other major AI labs. Five months after an April 2026 Series A at a $300 million valuation, the company was reported in September 2026 to have reached a $3.2 billion valuation, which Y Combinator described as the fastest unicorn milestone in the accelerator's history.
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