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AI training startup Mercor valued at $20 billion in latest funding round
Mercor has raised $750 million in a Series D funding round, valuing the AI training startup at $20 billion. The deal reflects strong investor interest in businesses that help develop AI, and gives Mercor more funding to train and test AI agents for professional tasks.
The San Francisco-based company connects technology firms with subject-matter experts who help train, test and improve AI models and agents. Investors included Benchmark, Felicis, Fundomo, Nvidia and funds managed by Apollo affiliates. Mercor was valued at about $10 billion after raising $350 million last October; AI-driven startups raised $102 billion, or 64 per cent of global venture capital, in the third quarter of 2026, according to Crunchbase.
In short
- Mercor raised $750 million at a $20 billion valuation.
- Nvidia and other investors joined the Series D round.
- The funding will support training and testing AI agents.
Steelman: both sides, in good faith
The strongest fair case each way — we don't pick a winner.
The case for
The funding round signals that investors see substantial potential in Mercor’s role connecting AI developers with professional expertise. More capital could help the company improve how AI agents handle specialised tasks, while creating business opportunities and demand for expert work in training and evaluation.
The case against
A $20 billion valuation rests on expectations about future growth and does not by itself show that Mercor’s business can sustain that value or that its AI training produces reliable results. The concentration of venture funding in AI may also raise concerns about inflated valuations and investment flowing to a narrow sector rather than a wider range of businesses.
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