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Thinking of launching a startup and want to top the funding charts? Your best bet these days is in the artificial intelligence space. That probably doesn’t come as a big surprise, given how prevalent news has been this year about mega-funding rounds for AI startups. But as fears of an AI bubble grow on Wall Street and real world adoption and use is still tentative, venture capitalists are flinging money at the companies building and supporting the technology at a staggering pace.
In the first half of 2025, funding to AI startups totaled $116 billion, which was greater than the total investor spend in 2024, according to CB Insights. That number increased by another $45 billion in the third quarter.
Some AI companies have done better than others in raising funding, though. Here’s a look at the biggest funding deals in the space this year.
OpenAI
It should come as no surprise that OpenAI, co-founded and run by Sam Altman, holds the title for the biggest single round raise of 2025. Its $40 billion round in March was the largest ever by a private tech company. It spiked the company’s valuation up to $300 billion, putting it just below SpaceX’s $350 billion figure and on par with TikTok parent company ByteDance. (That second-place ranking didn’t last long. A secondary sale last month valued the company at $500 billion. And there’s now talk of an IPO, which could be the biggest of all time.) Japan’s SoftBank was the largest contributor, kicking in $30 billion. Other backers included Microsoft, Coatue, Altimeter and Thrive. OpenAI, at the time, said it would use the money to “push the frontiers of AI research even further” and further scale its compute infrastructure.
xAI
Elon Musk’s AI startup doesn’t make formal announcements about funding, but Bloomberg, in October, reported the company had increased an ongoing funding round to $20 billion. Nvidia was reportedly one of the contributors, but has not confirmed that. The $20 billion figure leaked a month after reports that xAI was only planning to raise $10 billion in debt and equity. Musk has denied the reports on social media.
Scale AI
Scale AI was the beneficiary of Mark Zuckerberg’s 2025 spending spree, which was designed to beef up Meta’s AI workforce. Meta invested $14.3 billion in the company, taking a 49 percent ownership stake, but one that gives it no voting power and no access to Scale AI’s business information or data. As part of that deal, founder Alexandr Wang joined Meta, saying “opportunities of this magnitude often come at a cost.” A small number of Scale AI employees joined him in the move.
Anthropic
Anthropic introduced its AI assistant Claude in March of 2023 and has been on a steady climb ever since. In September, the company, founded by Daniela Amodei and Dario Amodei, closed its biggest round yet, raising $13 billion, which brought its valuation to $183 billion. That’s nearly three times what the company was valued at in March of this year, when it closed a $3.5 billion round at a $61.5 valuation. The September round was led by Iconiq, Fidelity Management & Research Co. and Lightspeed Venture Partners.
Databricks
While it’s not an AI company itself, the Databricks platform is used by large language models at AI firms to combine and standardize data, helping them learn. In early January, the company, which was founded by Ali Ghodsi, Ion Stoica, Matei Zaharia, Patrick Wendell, Reynold Xin, Andy Konwinski, and Arsalan Tavakoli-Shiraji, closed a Series J funding round for $10 billion, which it said it would use for expansion plans and product development. Backers included Meta, Thrive Capital, Andreessen Horowitz, DST Global, GIC, and Iconiq Growth. It raised the company’s valuation from $43 billion to $62 billion.
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Chris Morris
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