Funding Values AI Data Lab Snorkel at $3.5 Billion

Redwood City, CA-based Snorkel AI, whose data platform and agentic, research-driven data factory help inform AI model development, has raised $350 million in Series C funding, at a $3.5bn valuation. The firm says it will recruit researchers and engineers, to meet booming demand for complex training data.

Snorkel is led by CEO Alex Ratner, and has developed an agentic data factory and expert Data-as-a-Service platform delivering data, benchmarks, evaluations and custom environments for frontier and agentic AI model development. Clients are AI labs and global enterprises in sectors including healthcare, law and software engineering, as well as the US Federal Government.

Snorkel, which says it expects to reach profitability this year, combines human experts and thousands of specialized AI models and agents to create and check datasets. Quoted by Reuters, Ratner said experts devise design scenarios, tasks and grading rubrics, while AI automates much of the labor-intensive quality assurance process. The firm has built a network of 'tens of thousands of specialists' in coding, law, medicine and other fields.

The round was co-led by Insight Partners and S32, with participation from Addition, March Capital, Blumberg Capital, Allegis Capital, Frontline, Standard, Third Point Ventures, Greylock, Lightspeed, GV, Factory, Prosperity7, Walden Catalyst and Wells Fargo.

Home page: www.snorkel.ai .