Mercor Secures $750 Million in Series D Funding

Mercor has raised $750 million in a Series D funding round that values the artificial intelligence training startup at $20 billion, marking a substantial increase from its previous valuation.

The financing attracted participation from Benchmark, Felicis, Fundomo, Nvidia and funds managed by affiliates of Apollo, among other investors. The company plans to use the capital to expand its work training and testing AI agents on professional tasks.

The latest valuation represents a doubling from the approximately $10 billion valuation Mercor reached after raising $350 million in October 2025.

From AI Hiring Platform to Model Training

Mercor initially operated as an AI-powered hiring platform but has since developed into a business connecting technology companies with subject-matter experts. These professionals contribute specialized knowledge used to train, evaluate and improve AI models and agents.

The company’s business reflects a growing demand for human expertise in developing AI systems capable of performing specialized professional work.

Co-CEO Brendan Foody said the company expects AI agents to become relevant across the economy, with businesses requiring ways to train and evaluate these systems using their own operational knowledge.

Mercor’s latest funding will support that expansion, particularly in developing training and evaluation capabilities for professional tasks.

AI Funding Concentration Continues

Mercor’s financing comes amid strong investor interest in artificial intelligence companies. The flow of private capital into the sector has helped create a growing group of startups carrying multibillion-dollar valuations.

AI-driven startups raised $102 billion in the third quarter of 2026, accounting for 64% of global venture capital investment, according to the figures cited in the source material.

The concentration of venture funding highlights the scale of investor interest in companies developing AI infrastructure, applications and supporting services. Mercor’s valuation places it among the highly capitalized private businesses benefiting from this investment environment.

What Investors Should Watch Next

Mercor’s next phase will depend on its ability to translate the latest funding into broader adoption of its AI training and evaluation services. Its focus on professional expertise gives the company a role in the development of AI agents designed for specialized business tasks.

Investors will also be watching whether demand for human-led model training remains strong as AI systems become more capable. The company’s ability to support technology firms with reliable training and evaluation processes will be central to its commercial development and the sustainability of its current valuation.