AI Startup Valuations Are Tripling in Months as Mega-Rounds Flood Healthtech and Deep Tech
US AI startups raised over $1.5 billion in the final week of November 2025, led by $600 million for Physical Intelligence and $298 million for Function Health. At least 49 US AI firms have secured $100 million-plus rounds this year, with valuations often doubling or tripling within months. Healthcare AI dominates new funding. OpenAI’s ecosystem is now linked to nearly $100 billion in partner debt.