In 2025, the U.S. AI investment landscape entered uncharted territory, with startups attracting unprecedented capital in late-stage and mega rounds. According to PitchBook, AI-focused private-market activity surged throughout the year as investors poured billions into generative AI, enterprise software, and AI infrastructure leaders. Other US tech reports similarly note that large-scale AI deals accounted for a disproportionate share of total venture capital deployed, driving a sharp year-over-year increase in funding concentration.
Based on disclosed deal sizes, the top 10 US AI funding rounds of 2025 collectively raised approximately $84 billion. The figure highlights how capital has increasingly clustered around a small group of category-defining companies. From foundational model developers to data platforms and defence-grade AI systems, these financings signal where investor conviction is strongest and where the future of AI innovation in the United States is being built.
OpenAI
Founder/s: Sam Altman, Elon Musk, Ilya Sutskever, Greg Brockman, John Schulman, Wojciech Zaremba
Founded year: 2015
Recent funding: $40B
OpenAI has raised $40 billion in a new funding round that values the company at $300 billion post-money. The financing was led by SoftBank, with participation from existing backers including Microsoft, Coatue, Altimeter, and Thrive.
The fresh capital will be used to push the frontiers of AI research, significantly scale compute infrastructure, and deliver more powerful tools to the more than 500 million people who use ChatGPT each week.
Anthropic
Founder/s: Daniela Amodei, Dario Amodei
Founded year: 2021
Recent funding: $13B
San Francisco-based OpenAI rival Anthropic has secured a $13 billion Series F financing round, raising its valuation to $183 billion post-money. The funding will be used to scale enterprise adoption of its AI products, deepen safety research, and support international expansion.
The round was co-led by Iconiq, Fidelity Management & Research Company and Lightspeed Venture Partners, with participation from a broad syndicate of institutional investors, sovereign wealth funds, private equity firms and venture capital backers. Among them were Altimeter, Baillie Gifford, BlackRock, Blackstone, Coatue, D1 Capital Partners, Insight Partners, Ontario Teachers’ Pension Plan, Qatar Investment Authority, and others.
Project Prometheus
Founder/s: Jeff Bezos, Vik Bajaj
Founded year: 2025
Recent funding: $6.2B
Project Prometheus is developing AI for the physical economy. The company is training AI models optimised for engineering and manufacturing. The development effort focuses on use cases across the aerospace, automotive, and information technology markets. The company recently raised $6.2 billion in funding from Bezos and other investors.
The company’s focus on the aerospace sector suggests it may seek to collaborate with Bezos’s other venture, Blue Origin LLC. The latter company, which is developing reusable rockets, could benefit from AI tools that accelerate engineering tasks.
xAI
Founder/s: Elon Musk, Christian Szegedy
Founded year: 2023
Recent funding: $10B
Elon Musk’s AI company, xAI, has raised more than $10 billion in new capital, reaching a valuation of $200 billion. The round drew support from investors including Valor Capital, the Qatar Investment Authority, and Prince Al Waleed bin Talal via Kingdom Holding Company.
Alongside the equity funding, xAI is pursuing a further $3.5 billion in debt to accelerate the build-out of its data centre capacity. The company has also announced Grok 4 Fast, a faster, lighter and quicker reasoning model designed to deliver almost the same performance as Grok 4 while consuming 40% fewer thinking tokens.
Databricks
Founder/s: Ali Ghodsi, Ion Stoica, Matei Zaharia, Patrick Wendell, Reynold Xin, Andy Konwinski, Arsalan Tavakoli-Shiraji
Founded year: 2013
Recent funding: $5B
Data and AI powerhouse Databricks secured $5 billion in new financing at a valuation of $134 billion. The company received investment from global investors, including Andreessen Horowitz, Insight Partners, Apollo Global Management, The Blackstone Group, Goldman Sachs, JPMorgan Chase, Thrive Capital, and Morgan Stanley.
Databricks offers cloud-based data and artificial intelligence software that gives organisations a unified platform for data engineering, analytics and machine learning. The company’s core platform is designed to replace fragmented data stacks with a single environment where data teams can work from raw ingestion through to advanced analytics.
Anduril
Founder/s: Palmer Luckey, Trae Stephens, Matt Grimm, Brian Schimpf, Joseph Chen
Founded year: 2017
Recent funding: $2.5B
Defence tech unicorn Anduril has secured a massive new financing round of $2.5 billion. The round was led by Founders Fund, which pumped in $1 billion, the largest single cheque the firm has ever written. The round also saw strong participation from existing backers and doubled Anduril’s valuation to $30.5 billion.
Anduril, which develops autonomous defence systems and the software that powers them, raised the capital following a standout year of growth. In 2024, the company doubled its revenue to approximately $1 billion, reflecting the accelerating adoption of its technology amid rising global defence spending and renewed focus on modernising military capabilities.
Anysphere
Founder/s: Michael Truell, Sualeh Asif, Arvid Lunnemark, Aman Sanger
Founded year: 2022
Recent funding: $2.3B
Anysphere, the company behind Cursor, has landed a massive $2.3 billion fundraise last month. This round took the company’s valuation to $29.3 billion. Accel co-led the round with Coatue, while Thrive Capital and DST Global doubled down. Google and Nvidia were also invited to deepen existing partnerships.
Cursor has quietly embedded itself into the daily workflow of engineers across industries. Its adoption spans elite deep-tech labs like OpenAI, mainstream consumer giants such as Uber, Spotify and Instacart, and even unlikely users like Major League Baseball.
Thinking Machines Lab
Founder/s: Mira Murati, Jonathan Lachman
Founded year: 2024
Recent funding: $2B
Thinking Machines Lab has raised a $2 billion seed round, which is by far the largest ever recorded. The San Francisco-based company, launched in 2024 and founded by former OpenAI CTO Mira Murati, is already valued at $10 billion following the Andreessen Horowitz-led deal.
Murati left OpenAI last September after leading the development of some of the company’s most prominent AI products, including ChatGPT, DALL-E, and voice mode. Several of her former OpenAI colleagues have joined the new startup, including co-founder John Schulman.
Safe Superintelligence
Founder/s: Ilya Sutskever, Daniel Gross, and Daniel Levy
Founded year: 2024
Recent funding: $2B
Safe Superintelligence (SSI), an AI company co-founded by a former OpenAI chief scientist, has closed a $2 billion funding round. This influx of capital multiplied the company’s valuation over sixfold, from $5 billion to $32 billion, in less than a year, firmly placing SSI at the centre of the AI safety movement.
The funding includes a mix of equity and partnerships, with leading firms like Greenoaks Capital committing $500 million and further backing from major players like Alphabet, NVIDIA, Andreessen Horowitz, Lightspeed Venture Partners, and DST Global.
Reflection AI
Founder/s: Misha Laskin, Ioannis Antonoglou
Founded year: 2024
Recent funding: $2B
Reflection AI, which is building AI-powered coding automation tools, has raised a $2 billion funding round, valuing the company at $8 billion. This is a steep rise from its previous valuation of over $500 million after closing $130 million earlier this year. The latest funding round drew backing from an elite list of investors, including Eric Schmidt, Citi, 1789 Capital, Lightspeed, and Sequoia.
The company intends to use the funds to continue building and releasing frontier models sustainably.
