Top 10 Funding Rounds Led by AI, Space Tech, and Finance

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

Following a stretch featuring multiple billion-dollar-plus investments, venture investors scaled back the size of their checks this past week. The highest U.S. startup funding rounds reached the hundreds of millions, led by a $550 million financing round for AI infrastructure provider Temporal Technologies and a $308 million investment directed at space vehicle manufacturer Impulse Space.

The remainder of the top-tier rounds mostly highlighted AI-driven enterprises operating across sectors such as investment management, coding, networking, and marketing, alongside biotechnology and energy ventures. Additionally, data center developer Crusoe officially finalized its previously disclosed raise exceeding $3 billion, with Atreides Management, Valor Equity Partners, and Mubadala Capital acting as co-lead investors.

1. Temporal Technologies, $550M, AI infrastructure: Temporal Technologies, creator of an open-source platform designed to build and run long-running enterprise systems and AI agents, hauled in $550 million in Series E financing at a valuation of $12.55 billion. The Bellevue, Washington-based firm was backed by leading investors Lightspeed, Wellington Management, Goldman Sachs Alternatives, and Tiger Global.
2. Impulse Space, $308M, space tech: Located in Redondo Beach, California, Impulse Space builds space vehicles meant to transport payloads across and between different orbits. The company secured a $308 million Series D extension, lifting the total value of the combined round to $808 million.
3. Ridgeline, $250M, investment management: Ridgeline, an AI-powered platform for investment management, gathered $250 million via a Series E round. Spearheaded by chairman and founder Dave Duffield, the financing values the Incline Village, Nevada-based enterprise at $1.45 billion.
4. Cornelis Networks, $205M, networking: Headquartered in Wayne, Pennsylvania, Cornelis Networks specializes in networking technology built for high-performance computing and AI workloads. The company collected $205 million in fresh capital with backing from IAG Capital Partners.
5. Factory, $200M, AI software development: San Francisco-based Factory, which supplies AI-driven solutions for enterprise software development, announced a $200 million funding round valuing the business at $5 billion, supported by an extensive roster of venture capital firms and individual backers.
6. Profound, $180M, AI marketing: Profound provides marketing software designed to help clients boost their visibility within AI-generated search results. The New York-based enterprise raised $180 million through a Series D round at a $1.8 billion valuation, co-led by Kleiner Perkins and Sequoia Capital.
7. (tied) Arcee AI, $150M, foundational AI: Arcee AI, a developer specializing in open-weight artificial intelligence models, completed a $150 million Series B funding round that values the company at over $1 billion. The San Francisco enterprise saw its round co-led by Cambium Capital, Vista Equity Partners, and Emergence Capital.
8. (tied) Nex, $150M, gaming: Nex produces family-focused digital games utilizing body motion instead of traditional controllers. The San Francisco-based company brought in $150 million through new equity and debt financing, which featured a Series E round co-led by BAI Capital and Baillie Gifford. The firm did not disclose the specific equity breakdown.
9. Mazama Energy, $135M, geothermal energy: Mazama Energy, a Seattle geothermal enterprise concentrating on superhot rock geothermal power, secured $135 million in a Series B financing round led by Doerr Capital and Centaurus Capital.
10. Sling Therapeutics, $123M, biotech: Sling Therapeutics, an Ann Arbor, Michigan-based biotechnology company developing a small-molecule treatment for thyroid eye disease, finalized a $123 million Series C round led by Forbion Capital Partners.

Methodology

We tracked the largest announced rounds in the Crunchbase database that were raised by U.S.-based companies for the period of Sept. 12-18, 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.

Illustration: Dom Guzman

Frequently Asked Questions

What were the largest funding rounds of the week?

The top two funding rounds were a $550 million financing for AI infrastructure company Temporal Technologies and a $308 million investment in space vehicle developer Impulse Space.

Which sectors dominated the week’s top venture deals?

The remaining large rounds were heavily concentrated in AI-focused sectors—including investment management, networking, coding, and marketing—alongside biotech, gaming, energy, and space technology.

What was Temporal Technologies’ valuation after its funding round?

Temporal Technologies secured its $550 million Series E funding at a valuation of $12.55 billion.

Did any billion-dollar deals happen this week?

While this week’s announced rounds topped out in the hundreds of millions, data center developer Crusoe officially finalized a previously reported raise exceeding $3 billion.

What time period does this funding report cover?

The report tracks the largest announced rounds raised by U.S.-based companies in the Crunchbase database between September 12 and September 18, 2026.