US Startup Funding Rounds: September 28, 2026 – October 4, 2026
25 US venture rounds closed between September 28, 2026 and October 4, 2026, led by Vestwell at $385M (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 |
|---|---|---|---|---|---|
| Vestwell | New York, New York | $385M | Series E | October 1, 2026 | Vestwell is the modern fintech engine powering savings and investment programs for small businesses and individual savers across the country. We’re he… |
| Varda Space Industries | El Segundo, California | $251M | Series D | September 30, 2026 | Varda Space Industries is making reentry as common as launch. We are building the infrastructure for a thriving orbital economy and enabling foundatio… |
| PaleBlueDot AI | San Francisco, California | $200M | Series B | October 1, 2026 | PaleBlueDot AI is a leading AI Cloud Agent Platform based in Silicon Valley that connects AI cloud resource suppliers with customers. The company focu… |
| CAIS | New York, New York | $170M | Series D | September 28, 2026 | CAIS is the pioneer in democratizing access to and education about alternative investments for independent financial advisors, empowering them to enga… |
| CScale | Palo Alto, California | $145M | Series C | September 30, 2026 | CScale has launched to develop and commercialize optical interconnect technologies designed for gigawatt-scale artificial intelligence operations. The… |
| Quartermaster | Arlington, Virginia | $140M | Series B | September 29, 2026 | Quartermaster is an Arlington, Virginia-based startup that is developing a maritime sensing solution called SmartMast. This technology consists of adv… |
| Hertha Metals | Houston, Texas | $133.6M | Series A | September 29, 2026 | Hertha Metals is pioneering a breakthrough single-step technology for steel and high-purity iron production. Their innovative process enhances efficie… |
| Homeward | Austin, Texas | $120M | Series D | October 1, 2026 | Homeward helps real estate professionals better serve their clients and grow their business through an integrated suite of home buying, financing, mor… |
| Efficient | Pittsburgh, Pennsylvania | $97M | Series B | September 29, 2026 | Efficient is developing the world’s most energy-efficient general-purpose processor by combining ultra-efficient hardware with a developer-friendly co… |
| Confido | New York, New York | $55M | Series B | October 1, 2026 | Confido is a consumer packaged goods software platform that connects financial and operating records behind retail sales to help brands identify costs… |
| Fortem Technologies | Pleasant Grove, Utah | $50M | Series B | September 30, 2026 | Fortem Technologies is the leader in airspace awareness, security, and defense for detecting and defeating dangerous drones. Through an advanced, end … |
| Flow Engineering | San Francisco, California | $50M | Series B | September 30, 2026 | Flow Engineering, founded by Pari Singh in 2023, is a startup focused on revolutionizing hardware design and development. The company aids clients, in… |
| Metal | New York, New York | $50M | Seed | October 4, 2026 | Metal is a NYC-based provider of an AI platform designed for private market investors. The platform enhances research, screening, and diligence by lev… |
| ai3Bio | Watertown, Massachusetts | $48M | Series A | September 29, 2026 | ai3Bio is a biotechnology company focused on resetting the immune system. The company aims to advance therapeutic platforms targeting Th17 cells in vi… |
| Miter | San Francisco, California | $40M | Series B | September 30, 2026 | Miter is an HCM, field operations, and expense management platform built for contractors. Driven by a vision of a better built world, Miter empowers t… |
| doxx.net | Miami, Florida | $38M | Series A | October 1, 2026 | doxx.net is a Miami, FL-based provider of an Agentic Defined Networking (ADN) platform that enables people and their AI agents to create private, secu… |
| Outmarket | San Francisco, California | $34.5M | Series B | September 28, 2026 | Outmarket is the #1 AI platform for insurance, designed to empower agencies to scale their business without increasing headcount. The platform focuses… |
| Letterhead | Miami, Florida | $34M | Series A | September 28, 2026 | Letterhead is the developer of a newsletter operating system designed to help organizations manage, automate, and scale their newsletter programs. The… |
| Link Cell Therapies | South San Francisco, California | $30M | Series A | September 28, 2026 | Link Cell Therapies is a biotechnology company focused on advancing CAR-T therapies for solid and liquid tumors. Founded by experts from Stanford Univ… |
| Halluminate | San Francisco, California | $30M | Series A | October 1, 2026 | Halluminate is a San Francisco-based startup that builds AI training environments specialized for financial work. The company benchmarks AI models on … |
| 1Mind | San Francisco, California | $30M | Series A | October 4, 2026 | 1Mind is a startup offering an AI sales assistant named Mindy, which handles inbound sales and supports closing deals without relying on cold outreach… |
| EDGE Markets, Inc. | WILMINGTON, Delaware | $29.2M | Series A | October 1, 2026 | — |
| erad | Greenville, South Carolina | $22M | Series A | September 28, 2026 | — |
| OuterSignal | New York, New York | $22M | Series A | September 30, 2026 | OuterSignal is an agentic customer intelligence platform that helps brands understand their customers on a personal level, allowing for 1:1 personaliz… |
| Topsort | San Francisco, California | $20M | Series A | September 29, 2026 | Topsort is the leading retail media infrastructure company, empowering omni-channel retailers, marketplaces, and delivery apps in over 40 countries wo… |
Frequently asked
Which US startups raised funding between September 28, 2026 and October 4, 2026?
25 US companies closed named venture rounds between September 28, 2026 and October 4, 2026, raising $2.22B in total. The largest were Vestwell ($385M, Series E), Varda Space Industries ($251M, Series D), PaleBlueDot AI ($200M, Series B). 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 September 28, 2026?
Vestwell of New York, New York raised $385M in a Series E round announced October 1, 2026. Vestwell is the modern fintech engine powering savings and investment programs for small businesses and individual savers across the country. We’re helping to c 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 September 28, 2026 and October 4, 2026, totalling $2.22B. 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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