Updated August 2026. Written by Remy Beaumont.
Total raised in US this week: $4.75bn across 14 disclosed rounds.
Key takeaways
US funding rounds this week totalled roughly $4.75bn across 14 disclosed deals, with three separate $1bn+ rounds landing in five days.
The headline deal was Hadrian's $1.37bn Series D at a $7.87bn valuation, roughly 5x its January price in under 8 months.
The biggest surprise: JPMorganChase's Strategic Investment Group anchored or co led two of the three billion dollar rounds, deploying its $1.5tn Security and Resiliency initiative directly into venture.
Leading sector: energy for AI. Base Power and Valar Atomics alone took about 42% of the week's disclosed capital.
What did the US funding week look like?
Enormous at the top and thematic all the way down. US funding rounds this week delivered around $4.75bn across 14 disclosed deals, and three of them, Hadrian, Base Power and Valar Atomics, cleared $1bn each.
The theme underneath is the physical buildout of AI. Whatever the sector label, batteries, reactors, factories or optical chips, nearly every large cheque this week was underwritten by an AI thesis. For how this week compares with the wider month, see our monthly US funding roundup, and last week's edition is in our week ending 31st July teardown.
Which was the biggest round this week?
Hadrian's $1.37bn Series D at a $7.87bn valuation, announced on Wednesday 6th August. The Torrance based company builds highly automated factories as a service plus Opus, its physical AI factory software, making precision parts for Lockheed Martin, RTX and Anduril, with Opus already running inside the US Army and Navy. The round was co led by WCM Investment Management, Washington Harbour Partners, Valor Equity Partners, 137 Ventures and Baillie Gifford, with JPMorganChase's Strategic Investment Group as anchor.
The announcement is the real lesson. Hadrian ran a layered Wednesday rollout: Axios broke it as an exclusive, a PRNewswire release dropped in sync for everyone else, CEO Chris Power published a produced video on X, then took a CNBC interview on physical AI, and an NYSE content update rounded it out. That is the exclusive plus wire double drop we recommend to clients: one outlet gets the scoop and writes it properly, the wire keeps every other desk supplied the same morning, and the founder video gives social a native asset instead of a press release link. One round, four audiences, zero dead air.
The other big rounds this week
Base Power, $1bn Series D at $13bn post money (Austin, Monday). Distributed home battery and grid company, led by Ribbit, Addition, Valor and JPMorganChase's Strategic Investment Group. The PR play: they did not announce a round, they announced a product, the US made Base Core battery, with a round attached. TechCrunch covered it same day.
Valar Atomics, $1bn Series B at $6bn (Hawthorne, Monday), plus a $200m credit facility. Mass produced small nuclear reactors for AI data centres, led by Sequoia's Shaun Maguire. Announced via company blog with Bloomberg and TechCrunch same day. The company had already gone viral for taking the first startup reactor critical outside a national lab and using it to power an Nvidia GPU on stream. The demo was the PR.
Lumilens, over $700m Series C at $5.51bn (San Jose, Thursday). Optical interconnect chips replacing copper in AI data centres, co led by Atreides, Bain Capital Ventures, Meritech, Seligman and Spark. A stealth exit via wire release plus founder LinkedIn; note some headlines cite $900m, which is cumulative funding, not this round.
Horizon3, $250m Series E at over $2bn (San Francisco, Monday). Autonomous pentesting, co led by NightDragon and NEA. Clean press release with same day Forbes and TechCrunch coverage, all carrying the "AI vs AI" frame the company wrote itself.
HappyRobot, $150m Series C at $1.2bn (San Francisco, Tuesday). AI agents for logistics coordination with DHL and Uber Freight as customers, led by Prysm Capital and Eurazeo. Announced with a founder written blog post rather than a wire release.
Where is US capital flowing?
Into the machinery behind AI rather than models themselves. By disclosed dollars: energy and nuclear led with about 42% (Base Power plus Valar Atomics, both pitched as powering AI workloads), defence and advanced manufacturing took about 30% (Hadrian, Aurelius), AI infrastructure and software about 20% (Lumilens, HappyRobot, Convex, Sapiom, Naive), cybersecurity around 5% (Horizon3) and fintech under 3%. If you are a European founder watching this and wondering how to reach these cheque writers, start with our playbook on how European startups earn US press.
Notable US launches this week
Base Power launched Base Core, a 39.2kWh home battery designed and built at its Austin factory, billed as the first of its kind made in the US.
Meta launched Muse Code, an AI coding agent aimed squarely at Anthropic's Claude Code and OpenAI's Codex.
Lumilens emerged from stealth with its LumiCore optical interconnect platform, already shipping into a hyperscaler's production data centres.
What should founders raising soon do this week?
Pair your funding news with product proof. Base Power buried the cheque under a hardware launch and earned product coverage, not just a funding brief.
Run the exclusive plus wire double drop. Give one reporter the story, let the wire serve everyone else the same morning, as Hadrian did with Axios and PRNewswire.
Give social a native asset. A founder video, like Chris Power's, travels further than a press release link ever will.
Name the narrative before the press does. Horizon3 coined "AI vs AI" in its own release and every outlet repeated it.
If you have a demo that proves the thesis, lead with it. Valar's reactor powering a GPU on stream did more than any embargo could.
The rest of the week's top rounds
Convex, $57m Series B, reactive backend for AI generated code, led by Insight Partners.
Faye, $50m Series C, AI travel insurance, led by Madrona.
Aurelius Systems, $40m Series A, laser counter drone defence, co led by Draper Associates and KAS.
Sapiom, $35m Series A, AI agent compute routing, led by Dragonfly.
Multiplier, $35m Series B, AI powered professional services, led by The General Partnership (HQ reported as both San Francisco and Singapore; flagged).
Ambrook, $30m Series B, finance software for farms and the real economy, led by Lachy Groom, announced via an Upstarts Media exclusive.
Naive, $28.5m Series A, infrastructure for autonomous companies, led by Nexus Venture Partners.
Avatar Robotics, $6.5m seed, remote operated warehouse humanoids, led by AlleyCorp.
FAQ
How much did US startups raise this week?
Roughly $4.75bn across 14 disclosed rounds for the week ending 7th August, with three rounds of $1bn or more. The full market total will land higher once smaller seed rounds are tallied.
What was the biggest US funding round this week?
Hadrian's $1.37bn Series D at a $7.87bn valuation, announced 6th August, co led by WCM, Washington Harbour, Valor, 137 Ventures and Baillie Gifford, anchored by JPMorganChase.
Which sector led US funding rounds this week?
Energy for AI. Base Power and Valar Atomics together accounted for about 42% of disclosed capital, ahead of defence manufacturing at about 30%.
Who was the most notable investor this week?
JPMorganChase's Strategic Investment Group, which backed both Hadrian and Base Power as part of its $1.5tn Security and Resiliency initiative.
How were the biggest rounds announced?
Hadrian ran an Axios exclusive plus synchronised wire release and founder video; Base Power wrapped its round inside a product launch; Valar Atomics let a live reactor demo carry the story.
Enjoy tracking US funding rounds this week? We send the same analysis, plus the announcement playbooks behind the deals, every week in Ignita's free Substack.
