Re:Build’s $2.1B Round Leads a $4.7B Week in Startup Funding

Manufacturing and a predictions marketplace topped a week of large U.S. startup financings, with Re:Build raising $2.1 billion and Kalshi securing $1 billion. The ten listed rounds covered industrial production, construction automation, biotech, batteries, enterprise software and AI infrastructure, showing how capital flowed across businesses with very different routes to growth.

Re:Build’s financing was more than twice the size of any other round in the group. The Framingham, Massachusetts-based company works with industrial companies and product innovators, from design through large-scale manufacturing. Six years after its founding, it attracted backing from General Catalyst and JPMorganChase. The scale of the round puts manufacturing capacity at the center of this week’s funding picture, though the source doesn’t specify how the proceeds will be deployed.

Kalshi’s $1 billion Series G, led by Wellington Management and Sequoia Capital, set a $40 billion post-money valuation for the New York company. Kalshi says its annualized trading volume exceeds $1 trillion. Those figures give the financing a different profile from the industrial rounds: the valuation and reported trading activity point to the scale of the marketplace, while the article provides no breakdown of revenue or other measures of its financial performance.

Automation draws large checks

Construction technology and factory automation also featured prominently. San Francisco-based Bedrock Robotics raised $600 million in Series C funding, led by CapitalG and Emergence Capital. The company develops autonomous systems for heavy construction equipment. The round brings its total funding to nearly $1 billion and values the company at $4.1 billion after the financing.

Foundry Robotics raised $100 million in a Series A led by Marlinspike. Based in Emeryville, California, the startup aims to build and operate autonomous factories. Its raise was one of three $100 million rounds in the roundup, alongside financings for AI infrastructure and data analytics. The announced amount marks a substantial early financing, but the source gives no valuation or operating details for Foundry.

These companies apply automation to different settings: Bedrock develops systems for construction machinery, while Foundry is focused on factory operations. The comparison highlights the range of physical work that startups are targeting. Their funding amounts alone don’t show how quickly either business can turn development into deployments or production; the source doesn’t provide timelines or customer figures.

Biotech and batteries add distinct growth timelines

Biotech company Dren Bio closed a $350 million round led by Juvia Group and Lightspeed Venture Partners. The San Carlos, California-based company develops antibody treatments for cancer and autoimmune diseases. It said the funding will support advanced trials for its blood cancer therapies. That use makes the progress and results of those trials a key measure to watch; the source doesn’t give trial timing or outcomes.

Group 14 Technologies, a Woodinville, Washington-based producer and supplier of advanced silicon battery materials, raised $169 million in a Series D extension. It also announced plans to expand into Europe with a production facility in Sagunto, Spain. The financing and planned facility link capital raising to a stated production expansion, although the source doesn’t say when the facility is expected to open or how much capacity it will add.

Enterprise AI and infrastructure financing

Two $150 million rounds went to software and propulsion technology. San Francisco-based Serval raised $150 million in Series C funding at a $3 billion valuation. Sequoia Capital led the round. The two-year-old startup focuses on coding agents for enterprise automation. The amount and valuation make it one of the week’s larger software financings, while the source offers no figures on adoption or revenue.

Dallas-based Firehawk Aerospace secured over $150 million in Series D funding at a valuation of more than $1.4 billion. Advent and Rochefort led the financing for the seven-year-old company, which develops propulsion technology. Because both the funding and valuation are stated as “over” or “more than” a threshold, the source doesn’t provide exact totals.

AI infrastructure provider General Compute raised $100 million in Series A funding, led by Blackbird and Abstract. The company is building its infrastructure with inference chips from Cerebras Systems, SambaNova and Positron AI, which the source describes as competitors to Nvidia. The named suppliers make its infrastructure choices a notable detail, though no deployment scale or performance comparisons are provided.

Hex Technologies also raised $100 million. The San Francisco-based company is developing an AI-native data analytics platform. Peak XV and 137 Ventures led the round, which valued Hex at $1.2 billion. Together with Serval and General Compute, Hex shows how this week’s AI funding reached software applications, analytics and the computing infrastructure beneath them.

Roundup scope

The list tracks the largest announced rounds in the Crunchbase database for U.S.-based companies from Oct. 24-30, 2026. Some financings may appear after a delay because rounds can be reported late in the week. The amounts and company descriptions here reflect the roundup’s reported information; valuation, trial, production and customer details were not available for every company.

Illustration: Dom Guzman