Y Combinator invests in AfterQuery

Funding Provisional 62% confidence first seen 2 September 2026, 10:30

The coverage reports that Y Combinator-backed AfterQuery raised a Series B that increased its valuation from about $300 million to $3.2 billion in roughly five months. It describes the funding as making AfterQuery Y Combinator’s fastest-ever “unicorn,” with the new valuation attributed to YC partner Gustaf Alströmer. The article links the growth to AfterQuery’s business model shift toward paying experts to capture reasoning that becomes datasets and reinforcement-learning environments for AI labs.