The Week’s 10 Biggest Funding Rounds: AI, Space, FinTech and More

Every week the venture world hands out a handful of truly eye‑popping checks. This past seven days were no different – although the zeros on the checks have trimmed a bit, the headline numbers are still staggering. At the very top sits Temporal Technologies, a Bellevue‑based AI‑infrastructure company that just closed a $550 million Series E, pushing its valuation to a crisp $12.55 billion.

Hot on its heels, Impulse Space, the Redondo Beach outfit that’s building reusable vehicles to hop payloads between Earth orbits, landed a $308 million Series D extension. That pushes its total raised to a whopping $808 million.

In the world of money‑management, AI‑powered platform Ridgeline snagged $250 million in a Series E led by its own founder, Dave Duffield. The round set a $1.45 billion valuation for the Nevada‑based firm, underscoring how even traditional finance is getting a tech makeover.

Networking for AI and high‑performance computing isn’t far behind. Pennsylvania’s Cornelis Networks pulled in $205 million, thanks largely to IAG Capital Partners, as it scales its next‑gen data‑fabric technology.

Software development gets a boost too. Factory, a San‑Francisco AI‑tools shop for enterprise code, announced a $200 million raise at a $5 billion valuation, backed by a constellation of venture houses and individual angels.

On the marketing side, New York’s Profound, which helps brands show up better in AI‑driven search results, closed a $180 million Series D, giving it a $1.8 billion valuation. Sequoia Capital and Kleiner Perkins led the charge.

Two companies tied for the seventh spot. First, Arcee AI, a San Francisco startup building open‑weight foundation models, secured $150 million in Series B, crossing the $1 billion mark. Vista Equity Partners, Cambium Capital and Emergence Capital were on the investment side.

Also at $150 million, Nex – a playful gaming studio focused on body‑motion games for families – closed a mix of equity and debt, with Baillie Gifford and BAI Capital leading the round.

The energy sector makes the list thanks to Mazama Energy, a Seattle‑based developer of super‑hot rock geothermal power, which raised $135 million in a Series B led by Centaurus Capital and Doerr Capital.

Rounding out the top ten, Ann Arbor’s Sling Therapeutics, a biotech firm working on a small‑molecule therapy for thyroid eye disease, closed a $123 million Series C, with Forbion Capital Partners taking the lead.

These numbers were pulled from Crunchbase’s database, tracking all U.S.‑based rounds announced between September 12‑18, 2026. While we strive for completeness, a few deals sometimes slip in late, so the list may evolve modestly as the week winds down.