Snorkel AI triples valuation to $3.5B with a $350M Series E for AI training data

Snorkel AI triples valuation to $3.5B as demand for AI training data booms

Snorkel AI raised a $350M Series E at a $3.5B valuation, nearly triple its $1.3B mark from 17 months ago. The startup builds training datasets and simulated environments for AI labs and enterprises. Its customers include OpenAI, Anthropic, Google, and Microsoft. CEO Alex Ratner says ARR has passed $100M, doubling year-over-year. The post doesn't disclose profitability or per-customer revenue concentration, so I'd discount the valuation a bit until we see how fast big clients build in-house data pipelines.

Why it matters: Snorkel AI tripling its valuation to $3.5B with OpenAI, Anthropic, Google, and Microsoft as named customers is a real signal in AI infrastructure. But training data tooling is behind-the-scenes work — low practitioner resonance, so R axis missed, keeping this at the featured t...