California-Based Snorkel AI Raises $350M in Series C Funding

The round also saw participation from Addition, March Capital, Blumberg Capital, Allegis Capital, Frontline, Standard, Third Point Ventures, Greylock, Lightspeed, GV, Factory, Prosperity7, Walden Catalyst, and Wells Fargo.

The company plans to use the funding to expand its agentic data factory and increase investment in vertical and enterprise AI.

What is Snorkel AI?

Snorkel AI develops data platforms and services that help AI teams build the datasets, benchmarks, evaluations, and environments needed to train and test advanced AI systems.

The company focuses on what it calls Data 2.0, where AI development requires more complex expert tasks, environments, and evaluation systems rather than simple data-labeling work.

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Snorkel works with AI labs and enterprises on data used for frontier model training and evaluation.

How Much Funding Has Snorkel AI Raised?

Snorkel AI has raised $350 million in its Series C round at a $3.5 billion valuation.

The latest round was co-led by Insight Partners and S32, with participation from a broad group of existing and new investors.

The company also launched its expert Data-as-a-Service offering in September 2025 and has since expanded its work with AI labs and enterprises.

Who Invested in Snorkel AI’s Series C?

The Series C round was co-led by:

• Insight Partners
• S32

Other participating investors included Addition, March Capital, Blumberg Capital, Allegis Capital, Frontline, Standard, Third Point Ventures, Greylock, Lightspeed, GV, Factory, Prosperity7, Walden Catalyst, and Wells Fargo.

Why the Funding Matters

Snorkel AI will use the new funding to grow the capacity of its agentic data factory to meet increasing demand.

The company will also accelerate investment in vertical and enterprise AI as AI systems require increasingly complex data and evaluation environments.

Who founded Snorkel AI?

Snorkel AI was founded in 2019 by Alexander Ratner, Paroma Varma, and Henry Kiss Ehrenberg.

The company is based in Redwood City, California, and grew out of the Stanford AI Lab. Its founding team helped pioneer data-centric AI.

Leadership Comments

"The teams pushing the frontier want a research data partner who pioneers the science of data development," said Alex Ratner, co-founder and CEO of Snorkel AI. "That's what Snorkel was built to be: the frontier lab for agentic data, combining human excellence with over a decade of research and technology."

"Snorkel's research-grade approach to AI data, environments, and measurement is becoming an increasingly important ingredient in building capable and reliable AI systems – and their demonstrated growth at scale reflects that," said Lonne Jaffe, Managing Director at Insight Partners.

Market and Business Growth

Snorkel AI has grown its expert Data-as-a-Service business since launching it in September 2025. The company works with leading AI labs and enterprises on data for frontier model evaluation and training.

Its research roots include more than 250 peer-reviewed papers that have received over 25,000 citations.

What Happens Next?

Snorkel AI plans to expand its agentic data factory, increase its capacity to serve customers, and invest further in vertical and enterprise AI.

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