AfterQuery
About AfterQuery
AfterQuery is a AI Infrastructure startup based in San Francisco, United States that has raised $31M in venture capital across 2 funding rounds since 2025. The company reached Series A stage in Winter 2025 with a $0.5M round led by Y Combinator. AfterQuery's investor base includes 4 institutional funds, with Altos Ventures leading the most recent equity round.
AfterQuery is a San Francisco-based applied research lab that curates expert-level training datasets for frontier AI model development, employing nearly 100,000 verified professionals — doctors, lawyers, financial analysts, and engineers — to capture how domain experts think and reason. The company structures this expert reasoning into supervised fine-tuning data, RLHF datasets, agent environments, and custom benchmarks used by every major AI lab. Founded in January 2025 as a Y Combinator Winter 2025 company, AfterQuery reached $100M+ ARR within 14 months before closing its $30M Series A at a $300M valuation in April 2026.
AfterQuery Funding Rounds Timeline
2 rounds · $31M raised · since 2025
| Round | Date | Amount | Valuation | Lead investor | Co-investors |
|---|---|---|---|---|---|
| Seed | Winter 2025 | $0.5M | — | Y Combinator | — |
| Series A | April 2026 | $30M | $300M | Altos Ventures | Y Combinator, The Raine Group, BoxGroup |
Investors in AfterQuery
4 institutional investors across 2 rounds
Lead investors
Co-investors
Recent news about AfterQuery
- FundingAI training data startup AfterQuery nabs $30M investmentApril 2026
Questions about AfterQuery
How much has AfterQuery raised?
AfterQuery has raised $31M across 2 funding rounds since 2025.
Who are the investors of AfterQuery?
AfterQuery's investors include Altos Ventures, Y Combinator, The Raine Group, BoxGroup.
When was AfterQuery's last funding round?
AfterQuery's most recent round was a $0.5M Seed in Winter 2025, led by Y Combinator.
What is AfterQuery's valuation?
AfterQuery reached a $300M valuation with its Seed round in Winter 2025.
Where is AfterQuery headquartered?
AfterQuery is headquartered in San Francisco, United States, and was founded in 2025 by Spencer Mateega, Carlos Georgescu, Danny Tang.