In a year defined by mega-capital injections and outsized valuations, US startups have continued to command the world’s attention and investment. According to Crunchbase’s quarterly venture funding data, global venture investment reached $91 billion in Q2 2025, with the largest funding rounds capturing an increasing share of total capital compared with prior years.
Against this backdrop, the US ecosystem has produced some truly massive financings. From AI and data analytics powerhouses to high-growth software and fintech companies, these deals demonstrate not just investor confidence, but also a notable concentration of capital among a small number of breakout deals.
That said, here we rank the top 10 biggest funding rounds raised by US companies in 2025, spotlighting the startups that secured the largest funding to reshape the future of innovation.
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, valuing 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.
Separately, reports suggest that OpenAI is set to receive an additional $1 billion from The Walt Disney Company. If confirmed, the partnership will enable the latter to bring Disney characters to ChatGPT and Sora.
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.
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. 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.
Databricks has more than 20,000 customers. Notable Databricks customers include OpenAI Group PBC, Block Inc., Shell plc, Siemens AG, Toyota Motor Corp., AT&T Inc., Walgreens Boots Alliance Inc. and Rivian Automotive Inc.
Infinite Reality
Founder/s: Amish Shah, Elliott Jobe, John Acunto, Rodric David, Sean Cross
Founded year: 2019
Recent funding: $3B
Infinite Reality (iR), an innovation company powering the next generation of digital media and e-commerce through extended reality (XR), AI, and other immersive technologies, closed a $3 billion round of funding from a private investor whose portfolio focuses on global technology and real estate investments.
As per the company, it uses immersive technologies to offer a suite of services to brands and creators that can increase audience engagement and monetisation.
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 fundraising 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.
Acrisure
Founder/s: Greg Williams, Ricky Norris
Founded year: 2014
Recent funding: $2.1B
Acrisure, a global fintech provider offering technology-driven financial services to businesses and individuals, has secured $2.1 billion through the issuance of convertible senior preferred stock. The round was led by Bain Capital and included Fidelity Management & Research Company, Apollo Funds, Gallatin Point Capital, BDT & MSD Partners, alongside a broader group of investors.
The capital will be used to refinance part of the company’s non-convertible preferred stock, support strategic acquisitions, and expand its platform. The funding is also set to fuel organic growth and strengthen the integration of Acrisure’s portfolio of more than 900 acquisitions.
Reflection AI
Founder/s: Misha Laskin, Ioannis Antonoglo
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.
Polymarket
Founder/s: Shayne Coplan
Founded year: 2020
Recent funding: $2B
Polymarket, a prediction-market platform, has received a $2 billion investment from Intercontinental Exchange, or ICE. This move links the startup with the owner of the 233-year-old New York Stock Exchange.
With this, Polymarket reached a post-money valuation of $9 billion, and the partnership with ICE will allow for the distribution of Polymarket’s data to thousands of financial institutions around the world through the company’s financial infrastructure.
