Temporal Technologies, a Bellevue‑based AI infrastructure firm, led the week’s largest U.S. venture financing with a $550 million Series E round that valued the company at $12.55 billion. The round was headed by Lightspeed, Wellington Management, Goldman Sachs Alternatives and Tiger Global.
Impulse Space, a Redondo Beach developer of orbital payload vehicles, raised $308 million in a Series D extension, bringing its total financing to $808 million.
Investment‑management platform Ridgeline attracted $250 million in a Series E round led by founder Dave Duffield, setting a post‑money valuation of $1.45 billion.
Cornelis Networks, based in Wayne, Pennsylvania, closed a $205 million funding round backed by IAG Capital Partners to expand its networking solutions for AI and high‑performance computing workloads.
Factory, a San Francisco AI‑software developer for enterprise code, announced a $200 million round that valued it at $5 billion, with participation from a broad set of venture firms and individual investors.
Marketing‑tech startup Profound secured $180 million in Series D financing at a $1.8 billion valuation, led by Sequoia Capital and Kleiner Perkins.
Arcee AI, a San Francisco creator of open‑weight AI models, closed a $150 million Series B round that placed its valuation above $1 billion, with Vista Equity Partners, Cambium Capital and Emergence Capital as backers.
Nex, also based in San Francisco, raised $150 million in a mix of equity and debt, including a Series E led by Baillie Gifford and BAI Capital, to fund its motion‑based family gaming platform.
Mazama Energy, a Seattle geothermal developer, obtained $135 million in a Series B round led by Centaurus Capital and Doerr Capital.
Sling Therapeutics, a Michigan biotech firm developing a small‑molecule therapy for thyroid eye disease, completed a $123 million Series C round led by Forbion Capital Partners.
The rankings are based on Crunchbase data for U.S. companies that announced funding between Sept. 12 and Sept. 18, 2026. The list reflects only announced rounds captured in the database and may omit deals reported later in the week.
