US Startup Funding Rounds: August 3, 2026 – August 9, 2026
25 US venture rounds closed between August 3, 2026 and August 9, 2026, led by Hadrian at $1.37B (Series D).
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 |
|---|---|---|---|---|---|
| Hadrian | HAWTHORNE, CA | $1.37B | Series D | August 6, 2026 | Hadrian is a next-generation manufacturing company transforming the U.S. industrial base by rapidly adding domestic manufacturing capacity through its… |
| Base | — | $1B | Series D | August 6, 2026 | Base is a customer marketing platform built to unlock customer-led growth by enabling B2B organizations to create personalized, lifecycle-based engage… |
| K2 Space | WEST HOLLYWOOD, CA | $500M | Series D | August 3, 2026 | K2 Space is developing a high-powered, low-cost satellite bus platform that delivers the capability of exquisite satellites at the price point and spe… |
| LifeMine Therapeutics | Watertown, Massachusetts | $263M | Series D | August 6, 2026 | LifeMine Therapeutics Inc. is a clinical-stage biopharmaceutical company pioneering Top-Down Drug Discovery™. The company leverages digital genomic se… |
| Horizon3.ai | San Francisco | $250M | Series E | August 3, 2026 | Horizon3.ai’s NodeZero® Offensive Security Platform enables continuous exposure management across production infrastructure. By leveraging autonomous … |
| HappyRobot | San Francisco, California | $150M | Series C | August 4, 2026 | HappyRobot is a San Francisco-based company that specializes in AI-powered voice solutions for the logistics sector. It provides agentic AI for logist… |
| LMArena | San Francisco, California | $150M | Series A | August 6, 2026 | LMArena is an open community platform for evaluating AI models, aiming to bring scientific rigor to AI reliability. It provides a neutral, reproducibl… |
| Obsidian Security | Newport Beach | $85M | Series D | August 4, 2026 | Obsidian Security is the first truly comprehensive threat and posture management solution built for SaaS. Our platform consolidates data across core a… |
| NN, Inc. | CHARLOTTE, NC | $75M | Series D | August 5, 2026 | NN, Inc., a global diversified industrial company, combines advanced engineering and production capabilities with in-depth materials science expertise… |
| Faye | Los Angeles | $50M | Series C | August 5, 2026 | Faye is redefining insurance with the first 100% digital, consumer-centric travel insurance for Americans enabling smarter, faster, smoother assistanc… |
| Aurelius Systems | San Francisco, California | $40M | Series A | August 5, 2026 | Aurelius Systems is developing autonomous laser weapons to counter modern drone threats. Based in San Francisco, the company fuses advanced optics, AI… |
| Letter AI | Chicago, Illinois | $40M | Series B | August 7, 2026 | Letter AI is a Chicago-based sales startup that provides AI tools to streamline sales processes. Its software unites disparate tools into a single 'co… |
| WindBorne Systems | PALO ALTO, CA | $37M | Series B | August 5, 2026 | Global sensing for better weather forecasts. WindBorne designs, builds, and operates a constellation of long-duration smart weather balloons targetin… |
| Sapiom | Boston, Massachusetts | $35M | Series A | August 5, 2026 | Sapiom is a startup focused on developing financial infrastructure that allows AI agents to securely purchase and access software, APIs, data, and com… |
| Inocras & Summit Pharmaceuticals International Corporation | San Diego, California | $31M | Series B | August 3, 2026 | Inocras Inc. and Summit Pharmaceuticals International Corporation are collaborating to bring advanced whole genome sequencing (WGS) and bioinformatics… |
| Maximum | Miami, Florida | $30M | Seed | August 3, 2026 | Maximum is an AI-native operating system for banks that leverages AI at its core, providing an environment for banks to build and deploy custom agents… |
| Ambrook | Wyoming | $30M | Series B | August 5, 2026 | Ambrook's mission is to build a more prosperous and resilient future for America's family-run businesses. We're starting with accounting tools to help… |
| Fluxco | Austin, Texas | $26M | Seed | August 7, 2026 | Fluxco is an Austin, Texas-based developer of an AI-powered procurement platform for electrical grid infrastructure. The company specializes in matchi… |
| Fly.io | San Francisco, California | $25M | Series D | August 3, 2026 | Fly.io is a provider of a connected cloud infrastructure platform designed for AI agents and applications. The company builds infrastructure that offe… |
| Vori | San Francisco, California | $22M | Series B | August 6, 2026 | Vori is a provider of a self-driving operating system for grocery stores, focusing on automating checkout, inventory, ordering, pricing, and payments … |
| June Homes | New York | $20M | Seed | August 3, 2026 | June Homes is a flexible housing operator that aims to bring transparency to the rental market. The company is backed by SoftBank Ventures Asia and ha… |
| Baselayer | New York, New York | $20M | Series A | August 3, 2026 | Baselayer is an innovative B2B platform utilizing proprietary artificial intelligence technology to reduce fraud, automate business onboarding for SMB… |
| Cirius Therapeutics | Grand Rapids, Michigan | $14.7M | Seed | August 5, 2026 | Cirius Therapeutics is a clinical-stage pharmaceutical company developing innovative therapies for diseases caused by insulin resistance including Typ… |
| RWX | Columbus, Ohio | $12M | Series A | August 4, 2026 | RWX is the company behind Mint, the Continuous Integration and Continuous Delivery (CI/CD) platform with the best developer experience. |
| Eon | Denver | $10.8M | Seed | August 5, 2026 | Eon is changing the cloud data backup space by introducing a new storage tier that turns backups into live strategic assets — seamlessly automated, ra… |
Frequently asked
Which US startups raised funding between August 3, 2026 and August 9, 2026?
25 US companies closed named venture rounds between August 3, 2026 and August 9, 2026, raising $4.29B in total. The largest were Hadrian ($1.37B, Series D), Base ($1B, Series D), K2 Space ($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 August 3, 2026?
Hadrian of HAWTHORNE, CA raised $1.37B in a Series D round announced August 6, 2026. Hadrian is a next-generation manufacturing company transforming the U.S. industrial base by rapidly adding domestic manufacturing capacity through its highly au 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 August 3, 2026 and August 9, 2026, totalling $4.29B. 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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