AfterQuery

AI Training Data · Artificial Intelligence · Venture Capital

Funding

AfterQuery reportedly becomes YC's fastest unicorn ever at $3.2B

The jump reflects how urgently AI labs now pay for expert-level human reasoning data as scraped web text runs dry.

• AfterQuery has reportedly raised a Series B valuing the AI training-data startup at $3.2 billion, according to Forbes sources, up from $300 million just five months earlier.
• AfterQuery pays doctors, lawyers, engineers and other credentialed professionals to generate training data that captures expert reasoning, following a model pioneered by Mercor and Scale AI.
• The Series B's size and lead investor have not been disclosed, though one source told Forbes AfterQuery is already profitable and has a lead lined up; its April Series A was $30M led by Altos Ventures.
• Annualized revenue run rate reportedly grew from $100 million in April to the 'hundreds of millions' by July, per a post from co-founder Spencer Mateega.
• Co-founders Spencer Mateega, 23, and Carlos Georgescu, 22, joined Y Combinator's Winter 2025 batch just 18 months ago with no product, pivoting from an AI finance-agent idea into data services.
• A VC commentary noted the 10x markup came with no disclosed round size or lead investor, cautioning that 'reportedly valued at' is doing a lot of work in the headline.
• The speed of AfterQuery's climb signals how AI labs, having exhausted scrapable internet text, are now bidding up any startup that can supply verified expert human reasoning at scale.