The Week鈥檚 10 Biggest Funding Rounds: The Boring Co., Cognition And Motive Lead A Massive Week

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This is a weekly feature that runs down the week鈥檚 Top 10 announced funding rounds in the U.S. Check out last week鈥檚 biggest funding deal roundup here.

It was a monster week for U.S. startup funding, with four companies each raising $1 billion or more. 鈥檚 tunnel-drilling company led with a $3 billion Series D, followed by AI coding startup at $2 billion. Joining them near the top was fleet management software provider, which landed $1.3 billion, while reusable rocket developer raised another $1 billion.

Big checks also flowed to U.S. solar manufacturing, defense tech, legal AI and companies building the chips and networking infrastructure needed for artificial intelligence.

1. , $3B, transportation and infrastructure: Musk鈥檚 Bastrop, Texas-based tunneling company raised a $3 billion Series D led by the, with participation from investors including, and. The company is developing underground tunnel networks designed to move passengers and vehicles while reducing surface traffic, and already operates its Vegas Loop system beneath Las Vegas. The latest deal values it at $23 billion and brings its total funding to nearly $3.9 billion, .

2. , $2B, artificial intelligence: San Francisco-based Cognition raised a $2 billion Series E led by,,, and. The company is best known for Devin, its autonomous software-engineering agent, and is part of a highly funded crop of startups betting AI agents will take over increasingly complex coding and development work. Cognition has raised nearly $3.9 billion to date and was valued at $48 billion in the latest round, our shows.

3. , $1.3B, fleet management and transportation: San Francisco-based Motive raised $1.3 billion in private equity funding led by. The company, formerly known as KeepTruckin, has an AI-driven platform used by trucking, construction and other physical-economy businesses to manage fleets, monitor driver safety, and automate operations and spending. The latest deal brings Motive鈥檚 total funding to just over $2 billion, according to .

4. , $1B, aerospace: Kent, Washington-based Stoke Space raised a $1 billion Series E co-led by and, with among the additional investors. The company is developing fully reusable rockets, including its Nova launch vehicle, as it looks to lower the cost of transporting satellites and other payloads to orbit. The latest round values Stoke at $10 billion and brings total funding to . Its raise adds to the already record-setting sums for space tech startup investment this year.

5. , $835M, solar energy: Norcross, Georgia-based Suniva raised $835 million from investors including, and. The longtime U.S. solar manufacturer produces high-efficiency solar cells and plans to use new capital to expand domestic production, including a new South Carolina facility that would more than quadruple its manufacturing capacity. Suniva has raised nearly .

6. , $600M, defense tech: Huntington Beach, California-based Mach Industries raised a $600 million Series C from investors including and. Founded in 2022, the defense manufacturer develops unmanned aircraft, long-range weapons, propulsion technology and the infrastructure needed to produce defense systems at scale. Mach is part of a broader surge in venture investment into defense companies looking to bring Silicon Valley-style development and manufacturing speeds to military hardware. The latest round values the company at $3.7 billion and brings its total funding to .

7. , $550M, legal AI: San Francisco-based Harvey raised a $550 million Series H co-led by and, with investors including and also participating. Harvey builds generative AI tools for lawyers and other professional-services workers, with products for legal research, document analysis and contract work. The company was valued at $15.5 billion in the latest deal, which brings its total funding to date to nearly . That makes it one of the most well-funded players in the legal tech space, which has seen robust investment this year, though slightly lower than last year鈥檚 all-time high.

8. (tied) , $500M, semiconductors: Fab2 raised a $500 million Series A led by, with among the other investors. Formerly known as Atomic Semi, Fab2 is trying to rethink semiconductor manufacturing by designing its own fabrication tools, components and software with the goal of building smaller chip factories faster and more cheaply. The funding is the first disclosed round for the company, which maintains headquarters in California and Kentucky, and values it at $3.7 billion.

8. (tied) , $500M, AI infrastructure: Reno, Nevada-based Positron raised a $500 million Series C led by and, with among its other investors. The startup develops purpose-built hardware for AI inference, where models actually process queries after they have been trained, and is one of a growing crop of chip companies challenging GPUs in particular AI workloads. The latest financing values Positron at $5 billion and brings its total funding to nearly $1.2 billion, .

10. (tied) , $275M, AI networking infrastructure: Laguna Beach, California-based Celero Communications raised a $275 million Series C led by, and. Celero develops coherent digital signal processor technology that helps move enormous quantities of data between chips and data centers while using less power, an increasingly critical bottleneck as AI clusters grow. The round values the company at $3 billion and brings total funding to roughly , according to 小蓝视频色情网页版.

10. (tied) , $275M, biotechnology: South San Francisco, California-based Encoded Therapeutics raised a $275 million Series F led by, with investors including, and also participating. The clinical-stage biotech develops precision genetic medicines for severe neurological disorders, with its lead therapy targeting Dravet syndrome, a rare genetic epilepsy. Encoded has raised $514.1 million to date, .

Methodology

We tracked the largest announced rounds in the 小蓝视频色情网页版 database that were raised by U.S.-based companies for the period of Sept. 5-11, 2026. Although most announced rounds are in the database, there may be a small time lag, as some rounds are reported late in the week.

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