US Startup Funding Rounds: May 18, 2026 – May 24, 2026
25 US venture rounds closed between May 18, 2026 and May 24, 2026, led by Gradyent at $2B (Series E).
Every round below is a named venture round by a US-headquartered company, sourced from SEC filings and verified announcements. Investment funds, IPOs, post-IPO placements and valuation-only reports are excluded.
| Company | Location | Amount | Round | Date | What they do |
|---|---|---|---|---|---|
| Gradyent | Boston | $2B | Series E | May 18, 2026 | Gradyent is transforming the way we heat our homes, buildings, and industries—sectors that together account for nearly 50% of global energy consumptio… |
| ŌURA | San Francisco, California | $875M | Series E | May 22, 2026 | ŌURA is the company behind Oura Ring, which delivers personalized health data, insights, and daily guidance. With sleep as its foundation, Oura Member… |
| Metropolis | — | $500M | Series D | May 20, 2026 | The combined platform will seek to bring checkout-free payment experiences to consumers. The company equips existing parking structures with a compute… |
| Modal | New York, New York | $355M | Series C | May 21, 2026 | Modal is a company that provides a global, code-first compute platform built specifically for AI and machine learning workloads. Its platform supports… |
| Advanced Manufacturing Company of America | California | $300M | Series B | May 20, 2026 | Amca is a legacy aerospace business focused on revitalizing engineering in the aerospace and defense sectors. The company aims to foster innovation an… |
| The Marisol | Huntington Beach, California | $252.1M | Series A | May 22, 2026 | Bloom Family Foundation is developing a senior housing project in Huntington Beach, focused on assisted living and memory care. The Marisol will featu… |
| Armada | San Francisco | $230M | Series B | May 19, 2026 | Armada is the world’s first full-stack edge computing platform, revolutionizing connectivity, compute, and AI solutions where they’re needed most - an… |
| Mercury | Boston, MA | $200M | Series D | May 21, 2026 | Mercury was founded in 2021 to create an exclusive digital experience for top collegiate brands to bring fans closer to their favorite athletes and te… |
| RADAR | Brooklyn | $170M | Series B | May 19, 2026 | RADAR offers a proprietary hardware and software AI-platform that uses RFID and computer vision to turn physical stores into the equivalent of website… |
| Alpaca | OMAHA, NE | $150M | Series D | May 22, 2026 | Alpaca is on a mission to make it easier to support teachers and make school the happiest place to work. Survey your team and celebrate them person… |
| Nourish | New York | $100M | Series C | May 19, 2026 | Nourish is a telenutrition platform that connects people to registered dietitians for personalized nutrition counseling covered by insurance. The comp… |
| Sigma | Seminole, New York | $80M | Series E | May 18, 2026 | "The company will continue investing annually into all its Oklahoma facilities," said Tucker. With 65 plants and 184 distribution centers, the company… |
| AttoTude | California | $52M | Series C | May 22, 2026 | AttoTude, Inc. is a pioneer in the development of innovative interconnect technology for AI and hyperscale data center applications. The company is de… |
| Quartermaster | Virginia | $43M | Series A | May 20, 2026 | Quartermaster is an Arlington, Virginia-based startup that is developing a maritime sensing solution called SmartMast. This technology consists of adv… |
| Cagent Vascular | WAYNE, PA | $41M | Series D | May 18, 2026 | Cagent Vascular has developed and commercialized its novel angioplasty balloon with Serration Technology to treat blocked arteries in the leg or Perip… |
| Brami | Carlsbad, CA | $33M | Series B | May 19, 2026 | Remember food? Food made from thing's that grow. Food that's more than functional. Food that makes eating an experience. In our world, eating well is … |
| Handle.Com | San Francisco | $27M | Series B | May 24, 2026 | — |
| Lunar Helium-3 Mining | Scottsdale, Arizona | $20M | Series A | May 21, 2026 | — |
| Eisen | New York, New York | $18.5M | Series A | May 19, 2026 | Eisen is an AI-enabled compliance operations infrastructure designed to help financial services manage escheatment and account compliance efficiently.… |
| Xpanner | California | $18M | Series B | May 18, 2026 | Xpanner is a construction automation company that specializes in developing construction site automation through robotics and Physical AI. The company… |
| Sharebot | Albuquerque, New Mexico | $15.7M | Series A | May 21, 2026 | — |
| The Path | San Francisco, California | $14.3M | Seed | May 21, 2026 | The Path is a global AI therapy platform focused on long-term mental wellness. Co-founded by Tony Robbins and experts from the Calm app, it provides A… |
| Shyld AI | Sunnyvale, California | $13.4M | Seed | May 18, 2026 | Shyld AI is a healthcare technology company developing autonomous physical agents that streamline hospital operations like infection control, OR effic… |
| Hellbender | Pittsburgh, Pennsylvania | $12.5M | Seed | May 19, 2026 | Hellbender is a Pittsburgh, PA-based physical AI infrastructure company that builds integrated perception platforms enabling machines to see, understa… |
| Nanoco | Marshall | $12M | Seed | May 20, 2026 | The firm has tried and won some of the nation's top verdicts against the largest companies in the world. |
Frequently asked
Which US startups raised funding between May 18, 2026 and May 24, 2026?
25 US companies closed named venture rounds between May 18, 2026 and May 24, 2026, raising $5.53B in total. The largest were Gradyent ($2B, Series E), ŌURA ($875M, Series E), Metropolis ($500M, Series D). Each round below is sourced from SEC filings and verified announcements, and excludes investment funds, IPOs and post-IPO placements.
What was the largest funding round of the week of May 18, 2026?
Gradyent of Boston raised $2B in a Series E round announced May 18, 2026. Gradyent is transforming the way we heat our homes, buildings, and industries—sectors that together account for nearly 50% of global energy consumption. Heating It was the largest US venture round recorded in this window across 25 qualifying rounds.
How many US venture rounds closed this week?
25 named US venture rounds closed between May 18, 2026 and May 24, 2026, totalling $5.53B. This counts only rounds with a named series (Seed through Series G+) by US-headquartered operating companies. Investment funds raising vehicles, IPOs, post-IPO equity and valuation-only reports are excluded so the figures reflect genuine startup fundraising.
These are the rounds. Fundz gives you the people to call at each one — verified decision-makers matched to your market, the moment a round lands.
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