Tunnel Boring, AI Coding, and Fleet Management Dominate a Record Week of Startup Funding
Four companies each secured over $1 billion in funding this week, with Elon Musk's The Boring Co. leading the charge at $3 billion in a week that saw massive checks flow across infrastructure, artificial intelligence, and defense technology.
The U.S. startup funding landscape experienced an exceptionally strong week, marked by four separate companies announcing billion-dollar-or-larger funding rounds. The Boring Co., Cognition, Motive, and Stoke Space collectively demonstrated investor appetite for infrastructure, AI, and aerospace ventures, while additional capital flowed toward solar manufacturing, defense innovation, legal technology, and the semiconductor and networking systems underpinning artificial intelligence.
The Week's Top Funding Rounds
1. The Boring Co. — $3 Billion
Elon Musk's Bastrop, Texas-based tunneling venture raised $3 billion in a Series D round backed by the United Arab Emirates, alongside participation from Andreessen Horowitz, Sequoia Capital, and Valor Equity Partners. The company constructs subterranean tunnel systems intended to transport passengers and vehicles while alleviating surface-level congestion. Its Vegas Loop system already operates beneath Las Vegas. This funding round valued the company at $23 billion and brings cumulative funding to approximately $3.9 billion.
2. Cognition — $2 Billion
San Francisco-headquartered Cognition completed a $2 billion Series E funding round led by Accel, Andreessen Horowitz, Avenir, Founders Fund, and General Catalyst. The startup gained prominence through Devin, an autonomous agent designed to handle software engineering tasks independently. Cognition represents one of numerous well-capitalized startups wagering that AI agents will progressively assume responsibility for complex development and coding responsibilities. The company now carries a $48 billion valuation and has accumulated nearly $3.9 billion in total funding.
3. Motive — $1.3 Billion
Motive, operating from San Francisco, secured $1.3 billion through a private equity funding round spearheaded by General Catalyst. Previously operating under the name KeepTruckin, Motive provides an AI-powered platform serving trucking, construction, and other physical-sector enterprises for fleet oversight, driver safety monitoring, and operational automation. This investment brings Motive's cumulative funding to just above $2 billion.
4. Stoke Space — $1 Billion
Kent, Washington-based Stoke Space announced a $1 billion Series E round co-led by Point72 Ventures and Spark Capital, with Y Combinator also investing. The aerospace company focuses on developing fully reusable rockets, including its Nova launch vehicle, to reduce expenses associated with orbital transportation of satellites and cargo. The round valued Stoke Space at $10 billion and brings total funding to roughly $2.4 billion, contributing to record-breaking space technology investment levels this year.
5. Suniva — $835 Million
Norcross, Georgia-based Suniva raised $835 million from Electron Capital Partners, OIC, and Rubric Capital Management. The established U.S. solar manufacturer specializes in high-efficiency solar cell production and intends to deploy the capital toward expanding domestic manufacturing operations, including a new South Carolina facility that would increase manufacturing capacity by more than fourfold. Suniva's total funding to date reaches nearly $1.2 billion.
6. Mach Industries — $600 Million
Huntington Beach, California-based Mach Industries completed a $600 million Series C round supported by Ribbit Capital and Sequoia Capital. Established in 2022, the company manufactures unmanned aircraft, extended-range weaponry, propulsion systems, and manufacturing infrastructure for defense applications. Mach exemplifies a broader trend of venture capital flowing into defense enterprises seeking to apply Silicon Valley's rapid development and production methodologies to military equipment. The round valued Mach Industries at $3.7 billion and brings cumulative funding to nearly $1.1 billion.
7. Harvey — $550 Million
San Francisco-based Harvey announced a $550 million Series H round co-led by Diffusion and Lightspeed Venture Partners, with Andreessen Horowitz and Sequoia Capital also participating. Harvey develops generative AI applications serving attorneys and other professional-services practitioners, offering capabilities for legal research, document analysis, and contract management. The company achieved a $15.5 billion valuation in this round and has accumulated nearly $1.8 billion in total funding, positioning it among the most substantially capitalized legal technology enterprises. The legal tech sector has experienced considerable investment momentum this year, though slightly below previous year peaks.
8. Fab2 — $500 Million
Fab2 raised $500 million in a Series A round led by Fundomo, with Maverick Silicon among participating investors. Previously named Atomic Semi, Fab2 aims to transform semiconductor manufacturing by engineering proprietary fabrication equipment, components, and software to construct smaller chip factories with reduced timelines and expenses. This represents the company's first publicly disclosed funding round, valuing it at $3.7 billion. Fab2 maintains operations across California and Kentucky.
8. Positron — $500 Million
Reno, Nevada-based Positron completed a $500 million Series C round led by James Clark and NEA, with Qatar Investment Authority among additional backers. Positron manufactures specialized hardware designed for AI inference—the phase where trained models process actual queries—and competes with GPUs in specific artificial intelligence applications. The financing valued Positron at $5 billion and brings total funding to nearly $1.2 billion.
10. Celero Communications — $275 Million
Laguna Beach, California-based Celero Communications secured $275 million in a Series C round led by Atreides Management, CapitalG, and Valor Equity Partners. The company produces coherent digital signal processor technology enabling efficient data movement between chips and data centers while minimizing power consumption—an increasingly vital consideration as AI infrastructure scales. The round valued Celero Communications at $3 billion and brings cumulative funding to roughly $413.4 million.
10. Encoded Therapeutics — $275 Million
South San Francisco-based Encoded Therapeutics raised $275 million in a Series F round led by Google Ventures, with Arch Venture Partners, Janus Henderson Investors, and Venrock also investing. The clinical-stage biotech company develops targeted genetic medicines addressing severe neurological conditions, with its primary therapeutic candidate focused on Dravet syndrome, a rare genetic form of epilepsy. Encoded Therapeutics has accumulated $514.1 million in total funding.
Methodology
This analysis examined the largest announced funding rounds in the Crunchbase database for U.S.-based companies during September 5–11, 2026. While most announced rounds appear in the database, minor reporting delays may occur as some rounds are disclosed later in the week.
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