AfterQuery reportedly becomes Y Combinator's fastest unicorn, now valued at $3.2B

AfterQuery reportedly becomes Y Combinator’s fastest-ever unicorn, now valued at $3.2B

AI training-data startup AfterQuery raised a round at a $3.2B valuation, just five months after its $30M Series A at $300M. YC partner Gustaf Alströmer says it's the fastest launch-to-unicorn in the accelerator's history. The founders, now 22 and 23, were in YC's Winter 2025 batch 18 months ago. In April the company claimed a $100M annualized revenue run rate and named Nvidia, Legora, and Motif Technologies as customers. Unlike Mercor or Scale, AfterQuery trains models on how professionals work—encoding their decisions and reasoning—rather than just verifying answer accuracy. The post doesn't disclose the round size or lead investor; AfterQuery didn't respond to comment requests.

Why it matters: Fastest YC unicorn, 10x valuation jump in 5 months, $100M ARR — three hard numbers. The ding: this is TechCrunch relaying a report, not a primary announcement, and the post doesn't disclose the round size or investors. I'm discounting slightly for that.