Snorkel AI raised a $350 million Series E at a $3.5 billion valuation, a follow-on round that nearly tripled its $1.3 billion valuation from its $100 million Series D 17 months ago. The round was led by Insight Partners and S32, with participation from existing investors Addition, Lightspeed, Greylock, GV and Wells Fargo. The seven-year-old startup, which shifted last year from data labeling automation to a data-as-a-service model delivering completed datasets via synthetic generation alongside subject matter experts, reported a $375 million annualized revenue run-rate — an 18-fold increase in the last 12 months — and will use the funds to fuel its data-as-a-service approach.