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Series E round led by Insight Partners and S32 as company surpasses $380M in ARRR, up more than 18x in less than a year.
September 15, 2026
SAN FRANCISCO, September 22, 2026 — Snorkel AI, the frontier AI data lab, today announced it raised $350 million at a valuation of $3.5B in a round co-led by Insight Partners and S32, with significant participation from existing investor Addition. The round included new investors March Capital, Blumberg Capital, Allegis Capital, Frontline, Standard, One Prime Capital, Third Point Ventures, and D.E. Shaw Ventures, along with existing investors Greylock, Lightspeed, GV, Factory, BlackRock, Prosperity7, Walden Catalyst Ventures, and Wells Fargo. The investment will expand Snorkel’s agentic data factory, which supplies the data and environments behind the world’s most advanced AI lab systems.
The raise comes amid a fundamental phase shift in AI data. Building AI in the Data 1.0 era meant simple labeling tasks, a volume problem solved with headcount. Today’s frontier and agentic systems demand Data 2.0: expert agentic tasks, environments, and rubrics that take even the most qualified humans hours or days to construct. Designing them well is research work, where quality and complexity determine value.
Meeting that bar requires a wholly new paradigm for data development, which is partly why Snorkel has grown rapidly since launching its expert Data-as-a-Service offering in September 2025. The company works with leading AI labs and enterprises on the data behind frontier model evaluation and training. The work is a natural outgrowth of Snorkel’s roots: the company grew out of the Stanford AI Lab nearly a decade ago with a founding team that pioneered the field of data-centric AI and continues to contribute science on data at the jagged frontier of AI development. That body of work spans 250+ peer-reviewed papers cited more than 25,000 times.
“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. “We’re excited to back Alex and the team as they continue to bring their frontier AI data factory capabilities to longer-running, complex work in high value industries like healthcare, law, and software engineering.”
“Snorkel’s expert-agentic environments create a unique flywheel between human expertise and AI, delivering data at the speed and quality that enables a new era of efficiency and accuracy for model development,” said Andy Harrison, CEO and General Partner of S32. “Working with Snorkel ensures the highest frontier model success rate and creates a true partnership between model developer and data provider.”
Snorkel plans to use the funding to grow the capacity of its agentic data factory to meet demand, accelerate investment in vertical and enterprise AI, and extend its core research and technology into new domains and modalities. The company will also deepen its investment in open research, building on programs like its Open Benchmarks Grants initiative.
About Snorkel AI
Snorkel AI is the frontier AI data lab, helping teams build the data and environments behind high-performing frontier and agentic AI. We combine technology with research-driven AI data development to create datasets, benchmarks, evals, and custom solutions for real-world AI systems. Founded out of the Stanford AI Lab in 2019, Snorkel works with leading AI labs and enterprises to move from better data to better outcomes.
About Insight Partners
Insight Partners is a global software investor partnering with high-growth technology, software, and Internet startup and ScaleUp companies that are driving transformative change in their industries. As of December 31, 2025, the firm has over $90B in regulatory assets under management. Insight Partners has invested in more than 900 companies worldwide and has seen over 55 portfolio companies achieve an IPO. Headquartered in New York City, Insight has a global presence with leadership in London, Tel Aviv, and the Bay Area. Insight’s mission is to find, fund, and work successfully with visionary executives, providing them with tailored, hands-on software expertise along their growth journey, from their first investment to IPO. For more information on Insight and all its investments, visit insightpartners.com or follow us on X @insightpartners.
Media Contact press@snorkel.ai
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