Mercor announced a $750 million Series D at a $20 billion valuation Tuesday to expand its AI training business beyond frontier labs, TNW reported. The total includes employee share sales, with the fresh-capital portion undisclosed.
The San Francisco company pays specialists to help train and assess AI models. Its enterprise service tests agents against a client’s own tasks and standards. Mercor describes building an incident-response agent for an unnamed technology customer, using past outages and engineers’ criteria to assess versions before deployment.
Mercor announced a $350 million Series C on October 27, 2025, at a $10 billion valuation. It already described working with both AI labs and enterprises at that time.