Snorkel AI triples valuation to $3.5 billion in Series E round

Snorkel AI raised $350 million in a Series E round at a $3.5 billion valuation — three times the $1.3 billion valuation from 17 months ago — while its annualized revenue grew 18-fold to $375 million.

Compiled by Sergey KostenchukPublished 2026-09-23Updated 2026-09-23

2026-09-23 Business

💼 Snorkel AI: $3.5 billion valuation after $350 million Series E

The round was led by Insight Partners and S32. Annualized revenue grew 18-fold to $375 million. Snorkel has transitioned from data labeling software to data-as-a-service — ready-made datasets and RL environments for AI labs and enterprises.

🌍 A shortage of high-quality training data has become the bottleneck for frontier models: capital is flowing not into architecture, but into data infrastructure. Competitors Mercor, Handshake, and Micro1 spend 60–70% of gross revenue on payments to experts — the market's sustainability has not been proven.

👤 For teams with post-training and RL pipelines: ready-made RL environments will address some infrastructure tasks, but verify data quality and provenance separately — revenue growth confirms demand, not quality.

Source 1: https://techcrunch.com/2026/09/22/snorkel-ai-triples-valuation-to-3-5b-as-demand-for-ai-training-data-booms/

Source 2: https://news.ycombinator.com/item?id=49811361

Sources