Snorkel AI raises $350M Series E at $3.5B, tripling valuation in 17 months
ajratner · x · 2026-09-23
AI training data startup Snorkel AI has raised a $350M Series E at a $3.5B valuation, led by Insight Partners and S32, with Addition, Lightspeed, Greylock, GV and others participating — nearly triple the $1.3B valuation from its Series D 17 months ago.
Founder Alex Ratner says the company has grown 18x+ in the 12 months since launching its Data-as-a-Service offering, passing $375M ARR this week. Snorkel has shifted from data-labeling automation software to delivering completed datasets via a hybrid of synthetic data generation and domain experts, positioning itself as the RSI data engine and frontier data lab for the era of superhuman AI capabilities.
Related event: Snorkel AI Raises $350M Series E at $3.5B Valuation(15 posts)→
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