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Snorkel AI raises $350M at $3.5B valuation on soaring AI training data demand

The Stanford-spinout data startup has tripled its valuation in 16 months as frontier AI labs seek complex training datasets and reinforcement-learning environments.

newest coverage 23h agosummary written 1d ago19 pieces2 likes & upvotes3 comments NewswiresMastodonHacker NewsBluesky

What to know

  • Snorkel AI's $3.5 billion valuation represents a nearly 3x increase from $1.3 billion in May 2025, driven by revenue growth to $350 million annualized from $20 million a year ago.
  • The company has pivoted from software to a hybrid data-as-a-service model: human experts design scenarios and rubrics while AI agents automate quality assurance, combining specialized knowledge with automation.
  • Demand from frontier AI labs is shifting from simple labeling tasks to complex, high-stakes training data for increasingly capable systems—a trend accelerated by Meta's $14.3 billion investment in Scale AI last June.
  • Snorkel expects to reach profitability this year while continuing to hire researchers and engineers and expand into enterprise, government, and new data modalities.

Alex Ratner CEO, Snorkel AIAndy Harrison Partner, S32 (co-lead investor)Snorkel AI Data startupInsight PartnersInsight Partners Lead investor

Snorkel AI raises $350M at $3.5B valuation on soaring AI training data demand
Channel News Asia

How it unfolded 1 development · click the chart to see its coverage articles

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  1. 1

    Snorkel AI raises $350 million at $3.5 billion valuation

    Led by Insight Partners and S32, with participation from Addition, Greylock and Wells Fargo, the Series C round values the company at nearly three times its May 2025 valuation. Annualized revenue has reached $350 million, up from roughly $20 million a year earlier.

    “Our strong view is that 100 per cent of the data that labs will get value out of will have some human input in the foreseeable future. But 100 per cent of that data will have to use synthetic and automated approaches to keep up with this complexity.”
    — Alex Ratner
    1. 9 outlets Snorkel AI Raises $350M in Series C Funding

      first by FinSMEs, 1d ago · also Tech Funding News, The SaaS News, Snorkel AI, WOWTALE, SiliconANGLE, Coverager +2

      10 more headlines
    2. 2 outlets Exclusive-Snorkel AI valued at $3.5 billion amid surging demand for complex AI training data

      first by Channel News Asia, 1d ago · also TechCrunch

      1 more headline
    • nexttool.bsky.social

      Snorkel AI raises 50M at .5B valuation, nearly triple its prior valuation, as demand for AI training data soars.

      nexttool.bsky.socialBluesky23h agoview on Bluesky ↗
  2. background

    Investor highlights scarcity and specialization of quality training data — S32 partner Andy Harrison frames the investment context: specialized, high-quality training data is becoming rarer and harder to source, driving demand for platforms that combine human expertise with AI automation.

  3. background

    Meta invests $14.3 billion in Scale AI — Meta purchases a 49 percent stake in Scale AI for $14.3 billion, marking a major validation of the AI training data market.

  4. background

    Snorkel launches data-as-a-service business — The company shifts from selling software to supplying finished datasets and reinforcement-learning environments directly to customers.

  5. background

    Snorkel raises $100 million at $1.3 billion valuation — The company completes a funding round valuing it at $1.3 billion.

  6. background

    Snorkel AI founded by Stanford researchers — A team of researchers spins out of the Stanford AI lab to start Snorkel AI, initially selling software.