Snorkel AI

AI Training Data · AI Infrastructure · Reinforcement Learning

Funding

Snorkel AI raises $350M Series E at $3.5B valuation for AI data

The startup ditched its labeling-software roots to sell finished datasets and RL environments straight to frontier AI labs.

• Snorkel AI raised $350 million in a Series E co-led by Insight Partners and S32, valuing the AI training-data company at $3.5 billion.
• Snorkel AI builds the training data, evaluation rubrics and reinforcement-learning environments that frontier AI labs use to train and test agentic models.
• The company pivoted from selling data-labeling software to a data-as-a-service model launched in September 2025, delivering finished datasets rather than tools.
• Snorkel's annualized revenue run-rate surged from about $20 million to roughly $350 million over the past year, according to Reuters.
• The new valuation is nearly triple the $1.3 billion mark Snorkel reached with a $100 million Series D just 17 months earlier.
• Rival data providers are seeing similar surges: Mercor's gross annualized revenue has reached $2 billion and Handshake topped $1 billion, per TechCrunch.
• The jump shows AI labs shifting spend from simple human-labeled data toward costly, expert-built training environments as models tackle more complex agentic tasks.