The Biggest U.S. AI Startups Fundraising Rounds of 2025—So Far
Last year was a game-changer for the AI industry, both in the U.S. and globally. According to TechCrunch, 49 AI startups secured funding rounds of $100 million or more in 2024. Some companies even raised multiple “mega-rounds,” with seven reaching the billion-dollar mark.
How does 2025 compare? While the year is still unfolding, nearly a dozen U.S. AI startups have already surpassed the $100 million threshold—and one has even closed a round exceeding $1 billion.
Here’s a look at the U.S. AI companies that have secured major funding rounds in 2025 so far:
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March (U.S. AI Startups)
- Anthropic, a leader in AI research and large language models, raised a staggering $3.5 billion Series E, valuing the company at $61.5 billion. The March 3 round was led by Lightspeed, with backing from Salesforce Ventures, Menlo Ventures, and General Catalyst.
February (U.S. AI Startups)
- Together AI, an open-source generative AI and model development company, secured a $305 million Series B on February 20, valuing the company at $3.3 billion. The round was co-led by Prosperity7 and General Catalyst, with participation from Nvidia, Salesforce Ventures, and others.
- Lambda, an AI infrastructure startup, closed a $480 million Series D on February 19, with a valuation nearing $2.5 billion. SGW and Andra Capital co-led the round, with Nvidia, ARK Invest, and G Squared also investing.
- Abridge, a Pittsburgh-based AI platform for transcribing medical conversations, raised $250 million in a Series D on February 17, valuing it at $2.75 billion. IVP and Elad Gil co-led the round, alongside Lightspeed, Redpoint, and Spark Capital.
- Eudia, an AI-driven legal tech startup, closed a $105 million Series A on February 13. General Catalyst led the round, with contributions from Floodgate, Defy Ventures, and Everywhere Ventures.
- EnCharge AI, an AI hardware startup, raised $100 million in a Series B on February 13. Tiger Global led the round, with backing from Scout Ventures, Samsung Ventures, and RTX Ventures.
- Harvey, another AI legal tech startup, secured a $300 million Series D on February 12, reaching a $3 billion valuation. Sequoia led the round, with participation from OpenAI Startup Fund, Kleiner Perkins, and Elad Gil.
January (U.S. AI Startups)
- ElevenLabs, a synthetic voice technology company, closed a $180 million Series C on January 30, pushing its valuation past $3 billion. The round was co-led by ICONIQ Growth and Andreessen Horowitz, with Sequoia, NEA, and Salesforce Ventures also investing.
- Hippocratic AI, which develops healthcare-focused large language models, raised $141 million in a Series B on January 9. The round, led by Kleiner Perkins, valued the company at $1.6 billion, with Andreessen Horowitz, Nvidia, and General Catalyst among the investors
As the AI funding landscape continues to evolve, it’ll be interesting to see which companies join this growing list in the months ahead. Stay tuned for more updates on AI’s biggest funding rounds in 2025.
