Data startup Snorkel AI has raised $350 million in fresh funding at a $3.5 billion valuation, its CEO Alex Ratner told Reuters, as booming demand from frontier AI labs for increasingly complex training data and simulated environments fuels rapid growth.
Led by Insight Partners and S32, the funding round included participation from existing investors Addition, Greylock and Wells Fargo, the company said. The deal values the company at nearly three times the $1.3 billion valuation achieved when it last raised $100 million in May 2025.
