The Boring Co., Cognition and Motive lead week’s ten biggest US funding rounds

Four US startups raised $1bn or more in the week of 5 to 11 September 2026, according to Crunchbase. The Boring Co. led with a $3bn Series D that valued the tunnel-drilling company at $23bn, followed by AI coding startup Cognition at $2bn and fleet management software provider Motive at $1.3bn. Reusable rocket developer Stoke Space raised $1bn.

The Boring Co.’s round was led by the United Arab Emirates, with Andreessen Horowitz, Sequoia Capital and Valor Equity Partners also participating. Cognition’s Series E was led by Accel, Andreessen Horowitz, Avenir, Founders Fund and General Catalyst, while General Catalyst led Motive’s private equity round. Stoke Space’s Series E was co-led by Point72 Ventures and Spark Capital.

Further large rounds went to solar manufacturer Suniva at $835m, defence tech company Mach Industries at $600m and legal AI developer Harvey at $550m. Semiconductor startup Fab2 and AI inference hardware maker Positron each raised $500m, while Celero Communications and biotech Encoded Therapeutics raised $275m apiece.