Daniel Nadler Raises $210M and Hits Billionaire Status

On July 15, 2025, Daniel Nadler, cofounder and CEO of OpenEvidence, raised $210 million in a Series B round, valuing the Miami-based AI medical search platform at $3.5 billion, up from $1 billion in February.

The HIPAA-compliant tool, used by 40% of U.S. doctors across 10,000+ hospitals, aids 8.5 million monthly consultations by providing evidence-based answers from peer-reviewed journals like The New England Journal of Medicine and JAMA, tackling physician burnout amid a flood of medical research.

Nadler, owning roughly 60% after seeding the company with $10 million, is now a billionaire with an estimated $2.3 billion net worth, while cofounder Zack Ziegler’s 10% stake is worth about $350 million.

OpenEvidence’s revenue, estimated at a $50 million annualized rate from advertising, supports plans to expand content partnerships and enhance its DeepConsult AI agent for advanced medical research.

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