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

Snorkel AI has raised $350 million in a Series E round led by Insight Partners and S32, lifting its valuation to $3.5 billion—nearly triple the $1.3 billion valuation from its May 2025 funding round. The company’s annualized revenue run rate has surpassed $350 million, up from roughly $20 million a year earlier, driven by its data-as-a-service business launched in 2025. Snorkel has shifted from software for automating data labeling to supplying finished datasets and simulated reinforcement-learning environments for frontier AI labs, enterprises and government agencies. Its platform combines subject-matter experts with specialized AI models and agents to create, test and evaluate complex data, including for coding, law and medicine. The financing reflects surging demand for higher-quality, expert-built and synthetic data as AI developers move beyond basic labeling to train and assess more capable systems.