AI training startup Mercor has raised $750 million in a Series D round that values the company at $20 billion.
Investors include Benchmark, Felicis, Fundomo, Nvidia and funds tied to Apollo. Mercor began as an AI hiring platform and now links tech companies with specialists whose knowledge helps teach and assess AI models and agents.
The San Francisco company says the new capital will go toward evaluating and teaching agents to handle professional work. It was valued at about $10 billion after a $350 million raise in October 2025.
