Snorkel AI Triples Valuation to $3.5B as Demand for AI Training Data Booms
Snorkel AI closed a $350 million Series E on 22 September 2026 at a $3.5 billion valuation, led by Insight Partners and S32. Annualised run-rate has crossed $375 million, eighteen times where it stood a year earlier, on the back of a data-as-a-service business launched only in September 2025. The number nobody put in a headline is the multiple: it fell from roughly 65 times revenue to 9.3 times while the valuation nearly tripled. This article covers what Snorkel AI actually sells, why three outlets published three different revenue figures, how reinforcement learning environments became the expensive part of frontier training, and what the round says about where model capability is now bottlenecked.
