This is a weekly feature that runs down the week鈥檚 Top 10 announced funding rounds in the U.S. Check out last week鈥檚 biggest funding deal roundup here.

This week featured a robust lineup of large rounds, led by manufacturing startup , which closed on $2.1 billion, and predictions marketplace , which picked up another $1 billion. Other sectors in which startups drew significant rounds included construction automation, biotech, batteries and enterprise AI.

1. , $2.1B, manufacturing: Re:Build, a manufacturing startup that partners with industrial companies and innovators from the product design phase to large-scale production, secured $2.1 billion in new funding. and led the financing for the 6-year-old, Framingham, Massachusetts-based company.

2. , $1B, predictions marketplace: Predictions marketplace Kalshi announced a $1 billion Series G financing led by and . The round set a $40 billion post-money valuation for New York-based Kalshi, which says its business’ annualized trading volume now exceeds $1 trillion.

3. , $600M, construction tech: San Francisco-based Bedrock Robotics,聽 a developer of autonomous systems for heavy equipment used in construction, raised $600 million in Series C funding led by and . The round brings Bedrock鈥檚 total funding to nearly $1 billion and sets a post-money valuation of $4.1 billion.

4. , $350M, biotech: Dren Bio, a developer of antibody therapeutics for cancer and autoimmune diseases, closed on $350 million in a new round led by and . The funding will support advanced trials for the San Carlos, California-based company鈥檚 blood cancer therapies.

5. , $169M, battery tech: Woodinville, Washington-based Group 14 Technologies, a manufacturer and supplier of advanced silicon battery materials, picked up $169 million in Series D extension funding. The company also announced plans to expand into Europe with a production facility in Sagunto, Spain.

6. (tied) , $150M, defense tech: Firehawk Aerospace, a developer of propulsion technology, said it secured over $150 million in Series D funding at a valuation of more than $1.4 billion. and led the financing for the 7-year-old, Dallas-based company.

6. (tied) , $150M, enterprise AI: Serval, a startup focused on coding agents for enterprise automation, raised $150 million in Series C funding at a $3 billion valuation. led the round for the 2-year-old, San Francisco-based company.

8. (tied) , $100M, AI infrastructure: AI cloud provider General Compute picked up $100 million in Series A funding led by and . The company is building out its infrastructure using inference chips from rivals , and .

8. (tied) , $100M, autonomous factories: Emeryville, California-based Foundry Robotics, a startup focused on building and operating autonomous factories, closed on $100 million in a Series A funding round led by .

8(tied) , $100M, data analytics: Hex Technologies, a startup focused on building an AI-native platform for data analytics, secured $100 million in new financing. and led the round, which set a $1.2 billion valuation for the San Francisco-based company.

Methodology

We tracked the largest announced rounds in the SA国际传媒 database that were raised by U.S.-based companies for the period of Oct. 24-30, 2026. Although most announced rounds are in the database, there may be a small time lag, as some rounds are reported late in the week.

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SA国际传媒 data shows that so far this year, investors have poured around $48 billion into financings around the Series B stage 1, the highest tally in years. Yet round counts are below year-ago levels and are on track for a multiyear low.

Smaller Series B rounds grow scarcer

One trend driving capital concentration is a sharp decline in small and mid-sized Series B rounds.

So far this year, less than a third of deals in our sample set聽2 were for under $30 million. By contrast, between 2021 and 2025, rounds in this range accounted for about half of deals, per SA国际传媒 data.

The smallest Series B deals have gotten particularly scarce. This year there were just 26 rounds under $10 million in our sample set.

Big rounds still a big thing

On the flip side, really large Series B rounds are quite popular.

At least 110 companies have raised rounds of $100 million or more around this stage so far this year. That鈥檚 roughly a quarter of all deals.

Of these, the largest by far was a $12 billion round 3听蹿辞谤 , 鈥� physical AI startup that launched last year.

Model developer , led by AI pioneer , was tied for next-biggest fundraiser, closing on $1 billion in February. Nuclear energy startup also secured $1 billion in Series B funding across tranches this year, with as lead investor.

For聽 a wider snapshot, below we put together a sample list of more of this year鈥檚 biggest U.S. Series B recipients.

Mostly an AI story

Meanwhile, one of the least surprising findings from our analysis of Series B recipients is that it was a heavily AI-focused group.

So far this year, about two-thirds of Series B funding has gone to AI-focused startups, per SA国际传媒 data. In 2025, by comparison, about half of investment went to companies in AI categories.

AI companies were also heavily represented by round count. So far in 2026, more than half of all reported U.S. Series B deals have been for AI companies.

Bullish climate for Series B

Overall, the numbers point to a bullish climate for Series B investment, particularly for AI startups with demonstrated traction. The environment looks particularly favorable for companies that have already raised considerable sums at Series A and seed.

Even so, these don鈥檛 look like the best of times for startups seeking smaller Series B rounds. Seems like in the current AI-driven cycle, investors are increasingly focused on big checks for high-valuation companies.

Related SA国际传媒 query:

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Clocking in at 335 pages, the document wasn鈥檛 exactly light reading. However, after a preliminary once-over, we highlight a few of the more intriguing disclosures below:

Revenue growth is unusually rapid

For the first half of this year, Anthropic reported revenue of $16.3 billion. That鈥檚 up 14x from the same period in 2025.

Things aren鈥檛 slowing either. While the S-1 doesn鈥檛 forecast the second half of this year, has that Anthropic could reach a $110 billion annualized revenue run rate by year-end, citing analysts who met with company executives.

But losses persist

Anthropic also posted a $693 million operating income loss for the first half of 2026, down about two-thirds from last year. Its net loss for this year鈥檚 first half was $80 billion, of which about 90% stemmed from what it called a 鈥渃hange in fair value of convertible notes, derivative liabilities, and 蝉.鈥�

Founders hold similar stakes

Each of Anthropic鈥檚 seven founders holds between 230,000 and 246,000 shares of Class A stock, per the S-1. This kind of egalitarianism seems unusual given that startup prospectuses usually show a founding CEO with a much larger relative stake compared to co-founders.

The company鈥檚 co-founders include , , , , , and .

Anthropic鈥檚 risk factors take up 93 pages of its IPO filing

So, is investing in Anthropic a risky bet?

Anthropic certainly seems to think so. The company鈥檚 IPO prospectus contains a staggering 93 pages of risk factors. They start at page 27 and end on page 120.

Some are pretty mundane. For instance, the company is concerned that slower revenue growth could potentially constrain its ability to fund frontier AI development and attract and retain top talent. Having incurred significant debt to date, it鈥檚 worried about the ability to keep servicing those obligations while still covering operating costs.

But more unusual risks, like rogue AI agents, are in there too. In one section, Antrophic notes that 鈥渇uture models are expected to demonstrate capabilities that could provide meaningful assistance to malicious actors seeking to develop chemical, biological, or other dangerous weapon蝉.鈥�

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• Oura Hits Pause On IPO While Anthropic鈥檚 Prospectus Reveals The Cost Of Its AI Ambitions
• The AI IPO Wave Is The Dot-Com Bubble’s Evil Twin. Anthropic鈥檚 Delay Just Proved It.
• Anthropic Files Confidentially For IPO
• A Hard Year For Software IPOs

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But that鈥檚 not all. As investment hit unprecedented levels in 2026, Golden State companies alone raised more than all U.S. startups in any prior year on record. Most of that stems from a handful of megarounds for San Francisco-based AI pioneers.

And keep in mind: This year still has a couple months left. Yet California companies have already pulled in an unparalleled $385 billion in seed- through growth-stage rounds. That鈥檚 more than double last year鈥檚 tally.

California鈥檚 share of U.S. startup funding also has been trending higher for the past three years. Much of this is due to San Francisco AI unicorns, but we鈥檙e also seeing strength in the broader Silicon Valley region as well as Southern California.

Where the money went

Flabbergasting financings for San Francisco-based and account for more than half of this year鈥檚 California statewide tally. But even without those, California companies 1 still secured a disproportionate share of the largest U.S. equity funding rounds.

To illustrate, we used SA国际传媒 data to put together a list of the 10 next-largest California funding rounds this year.

Some of these are familiar names and involve fairly mature companies. For instance , which launched inside in 2009 and spun out as an independent company 10 years ago, picked up $16 billion in February.

Another old-timer is , which picked up $5 billion in August. It鈥檚 now 13 years old and has raised over $30 billion in debt and equity funding to date.

Still, we鈥檙e also seeing younger companies secure megarounds. , the physical AI startup co-founded and led by and launched last year, pulled in $12 billion in new funding this spring. And AI model startup landed $5 billion in a -led round this summer.

Early-stage funding

That brings us to our next point. California鈥檚 startup funding windfall isn鈥檛 only about late-stage and pre-IPO companies bagging enormous rounds. Early- and seed-stage companies are also attracting big checks from investors.

Per SA国际传媒 data, California companies have secured nearly $62 billion in seed- and early-stage financings so far in 2026. That鈥檚 roughly 57% of all U.S. funding at these stages.

It鈥檚 also far above prior year tallies, as charted below, and appears to be a record funding level.

Don鈥檛 bet against California

If there鈥檚 a lesson to be learned in these numbers, it鈥檚 one that savvy startup investors ought to have learned a long time ago: Don鈥檛 bet against California.

Whatever the year, whatever the technology cycle, California, and Silicon Valley in particular, have a knack for being home to the leading companies of the era.

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This is a weekly feature that runs down the week鈥檚 Top 10 announced funding rounds in the U.S. Check out last week鈥檚 biggest funding deal roundup here.

It was another interesting week for AI-related startup funding, with a number of large rounds and quirky companies. The largest financings went to , a developer of AI processors and systems, and AI lab . The quirkiest round, meanwhile, was undoubtedly a $200 million financing for , which wants to breed elite military dogs.

A number of big rounds in areas including biotech, space tech and physical AI rounded out the list.

1. , $1.5B, AI infrastructure: Santa Clara, California-based Tenstorrent, a developer of AI processors and systems, secured $1.5 billion in Series E funding. and led the round, which set a $6.2 billion valuation for the 10-year-old company.

2. , $1B, foundational AI: Flapping Airplanes, an AI lab with a focus on developing models that cost less to train and run, closed on $1 billion in Series A funding led by and . The round comes less than 10 months after the year-old San Francisco startup raised a $180 million seed financing.

3. , $325M, AI for critical infrastructure: ASI, a developer of AI technology for securing and operating critical infrastructure in areas such as aviation, transportation and defense, picked up $325 million in Series C financing. led the round, which set a $3 billion valuation for the Boston-based company.

4. , $250M, space tech: Xona, a startup developing a next-generation version of GPS, raised $250 million in Series D funding led by . The round sets a $2.4 billion valuation for the Burlingame, California-based company.

5. , $237M, biotech: Pathos AI, a startup applying AI to drug development, completed a $237 million Series E financing at a post-money valuation around $3 billion. led the financing for the New York-headquartered company.

6. , $215M, AI, robotics and life sciences: Warp Sciences, a startup applying AI and robotics to help develop new medicines faster, raised a $215M Series A round led by .

7. (tied) , $200M, online business marketplace: Whop, a platform that helps entrepreneurs build and run online businesses, secured $200 million in Series D funding led by and . The round set a $5.1 billion valuation for the New York-based company.

7. (tied) , $200M, biotech: South San Francisco, California-based drug developer聽 Star Therapeutics says it raised $200 million in new financing led by and . The investment follows 鈥檚 July acquisition of , a subsidiary of Star, in a deal valued at up to $2 billion.

7. (tied) , $200M, military dogs: Warhound, a startup that wants to breed working dogs for U.S. military forces and emergency responders, launched from stealth with $200 million in seed funding from a long list of backers including and 1.聽 The startup, co-founded by founder , plans to equip the dogs with Anduril technology.

10. , $160M, AI manufacturing software: Arda Industries, a developer of AI-powered software for manufacturing engineering, closed on $160 million in Series A funding at a $1.5 billion valuation, co-led by , and . The San Francisco-based startup also announced a previously undisclosed $72 million seed financing.

Methodology

We tracked the largest announced rounds in the SA国际传媒 database that were raised by U.S.-based companies for the period of Oct. 17-23, 2026. Although most announced rounds are in the database, there may be a small time lag, as some rounds are reported late in the week.

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But that鈥檚 often not the case, an analysis of SA国际传媒 data shows. This year, a number of larger acquisitions of private companies involved startups that haven鈥檛 disclosed a new investment for more than four years.

Several of these acquisitions are quite recent 鈥� and in some cases, quite large. The standout is 鈥檚 purchase earlier this month of , a platform for catering and workplace meals, for $2.3 billion in cash. The deal comes nearly five years after Boston-based ezCater raised its last reported venture funding round.

That鈥檚 not the only one. A number of companies whose names might feature on a playlist of 2021 boom-era unicorns have sold to acquirers in recent months, including one-time highfliers like , and . In many cases, companies are selling at valuations which, while not puny, are still far below their former peaks.

Who鈥檚 getting acquired

To illustrate the extent to which these aging startups are finding acquirers, we used SA国际传媒 data to put together a list of 15 deals involving well-funded companies that haven鈥檛 raised equity funding for four or more years.

Post-peak runway

One big issue for older and middle-aged startups is that valuations hit a cyclical peak in 2021 and early 2022. Many companies that raised during that time had difficulty attracting fresh capital or were reluctant to close new rounds at reduced valuations. Even with the more recent AI boom, little went to this cohort.

Moreover, since the 2021 boom-era rounds were quite large, funded startups commonly had the option to cut operating costs and extend their runways with existing capital. As a result, quite a few companies that haven鈥檛 raised rounds in years are still chugging along, managing to survive and even grow without more venture funding.

EzCater is a case in point. In the year prior to its acquisition, the business generated more than $2.5 billion in gross bookings. It had an annual growth rate in the high teens, with average order sizes over $400.

That said, even that revenue and growth rate didn鈥檛 secure ezCater much of an acquisition premium from its last funding round. At $2.3 billion, Uber鈥檚 purchase price is 53% above the $1.5 billion pre-money valuation the catering startup secured in its last funding round in late 2021.

Acquisitions below peak venture valuation

In many cases, even good-sized acquisitions of well-funded startups are occurring at valuations far below former peaks.

Take Miro, a provider of online collaboration tools that agreed to sell to last month in a deal valued around $1.36 billion. That鈥檚 a huge step down from early 2022, when San Francisco-based Miro closed its last round at a $17.5 billion post-money valuation.

Or consider Bending Spoons鈥� prior purchase of data and workflow platform , for $1.28 billion in August. That鈥檚 barely over one-tenth the $11 billion valuation Airtable secured in its December 2021 Series F.

Fashion startup is another that lost its shimmer after securing a 2020 valuation in the hundreds of millions. It sold to fast-fashion leader this spring for $100 million.

In the health and wellness sector, meanwhile, Headspace also saw its valuation plunge. The meditation and mental health app sold to in a deal reportedly valued around $300 million. That鈥檚 well below its peak post-money valuation of around $2.6 billion.

A good thing?

While startup investors aren鈥檛 celebrating acquisitions made far under peak private valuations, they鈥檙e not the worst outcome. And for startups themselves, they鈥檙e also far from a catastrophic scenario.

Of course, every unicorn investor hopes for high-multiple returns. But for startups that go years without funding, the market seems to be telling us that鈥檚 not likely in the cards.

Related SA国际传媒 list:

Related reading:

• Global Venture Funding And Unicorn Creation In 2021 Shattered All Records

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This is a weekly feature that runs down the week鈥檚 Top 10 announced funding rounds in the U.S. Check out last week鈥檚 biggest funding deal roundup here.

Startup investors aren鈥檛 exactly hitting pause, but they did scale back on giant rounds this past week, with just two startup financings in the multiple hundreds of millions. The biggest round went to AI infrastructure provider , which picked up $750 million, followed by construction automation unicorn , which secured $200 million. Other sectors that attracted larger rounds this past week included biotech, insurance and AI.

1. , $750M, AI infrastructure: Modal Labs, a provider of cloud infrastructure for AI inference and other applications, secured $750 million in a Series D funding round led by at a $15.75 billion valuation. The New York-headquartered company said it recently exceeded an annual revenue run rate of $1 billion.

2. , $200M, construction tech: Austin-based Icon, a developer of robotic construction systems known for its 3D-printed homes, closed on $200 million in Series D funding led by聽 and . The company says it is on pace for 4x revenue growth in 2026.

3. , $135M, RNA therapies: Boston-based Souffl茅 Therapeutics, a developer of RNA therapies, raised $135 million in Series B funding led by as part of a large syndicate of investors.

4. , $103M, gene therapies: Menlo Park, California-based Estuary Biotherapeutics, a developer of genetic medicines for patients with serious kidney diseases, launched with $103 million in financing. The funding includes $93 million in a Series A round led by as well as $10 million in previously undisclosed seed capital.

5. , $100M, AI tools: Labelbox, a developer of technology to train and evaluate AI models and to help deploy agents that improve with experience, picked up $100 million in Series E funding. led the financing for the 8-year-old, San Francisco-based company.

6. , $90M, health AI: Redwood City, California-based Suki, a provider of AI tools that turn clinical conversations into intelligence for documentation, coding and other healthcare workflows, announced a $90 million Series E financing from backers including and .

7. , $82M, caregiver platform: Abby Care, a platform for family members to become certified, paid caregivers and deliver care at home, closed on $82 million in Series C funding, per a . led the financing for the 5-year-old, San Francisco-based startup.

8. , $70M, insurance: Stand, a provider of insurance for homes in areas at higher risk of natural disasters, secured $70 million in Series C funding at a $1 billion valuation. led the financing for the 3-year-old, San Francisco-based company.

9. , $65M, semiconductor systems: Mueon Corp., a semiconductor systems company building a modular platform for AI and hyperscale computing, completed a $65 million Series A funding round. led the financing for the Portland, Oregon-based company.

10. , $60M, AI spend management: New York-based North.cloud, provider of an infrastructure spend intelligence and automation platform, raised $60 million in a Series B round led by .

Methodology

We tracked the largest announced rounds in the SA国际传媒 database that were raised by U.S.-based companies for the period of Oct. 10-16, 2026. Although most announced rounds are in the database, there may be a small time lag, as some rounds are reported late in the week.

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Overall, investors put $38.5 billion into reported seed- through growth-stage financings for countries in the region in Q3, per SA国际传媒 data. Of that, a majority went to AI-focused companies, echoing the trends we鈥檝e seen globally.

Deal counts, meanwhile, were relatively flat. That indicates concentration of capital into favored startups remains pronounced but is not intensifying.

Table of contents

• An AI-driven quarter
• China leads by far in country-by-country breakdown
• Late stage
• Early stage
• Seed
• A big quarter for China
• Methodology
• Glossary of funding terms

An AI-driven quarter

Around 55% of investment 鈥� an estimated $21 billion 鈥� went to AI-focused companies. Total funding is down substantially from the prior quarter, which was boosted by a $7.4 billion financing for China鈥檚 , but still the second-highest tally on record.

For Q3, a couple of extra-large rounds bolstered the AI investment tally. The largest went to Beijing-based foundational model company , which secured $3.5 billion in July at a reported $35 billion valuation.

, the AI spinout of China-based short video platform , was the second-biggest fundraiser. The generative video startup raised around $3 billion in a July financing that included and .

China leads by far in country-by-country breakdown

China was the leading Asian destination for venture investment by a very wide margin.

Per SA国际传媒 data, roughly $27 billion 鈥� or 70% of all Asian startup funding in Q3 鈥� went to China-based companies. India was a distant second, with $2.9 billion, followed by Singapore, with $2.5 billion.

For perspective, below we charted third-quarter startup funding tallies for the six countries with the largest totals.

Late stage

Most capital went to late- and growth-stage funding rounds.

Per SA国际传媒 data, investment at this stage totaled around $20 billion in Q3. That鈥檚 down a bit from the prior quarter but nearly double year-ago levels and the second-strongest showing in four years.

Multiple jumbo rounds kept the total high. The largest was Moonshot AI鈥檚 aforementioned $3.5 billion Series F.

Several others raised financings in the multiple hundreds of millions. Shenzhen-based , a provider of robotics hardware and software, for instance, picked up $400 million in a September Series C. And Hong Kong-based , an e-commerce fintech platform, secured $300 million in Series C funding as it eyes an IPO.

Early stage

Early-stage investment drifted lower in Q3 but remained at historically high levels.

Per SA国际传媒 data, financing for startups at the Series A and Series B stages totaled $13.6 billion for the just-ended quarter. That鈥檚 a decline of 28% from the prior quarter but up 65% from year-ago levels.

Seed

Reported seed funding hit its highest level in years, boosted by investor enthusiasm around AI.

In total, investors poured $4.9 billion into reported seed and angel deals across Asia, per SA国际传媒 data. That鈥檚 up around 22% from the prior quarter and more than double year-ago levels.

A big quarter for China

Overall, Q3 was a robust period for venture funding to China-based companies, with far smaller sums going to other Asian startup hubs. Funding to startups based in India and Singapore was down significantly quarter over quarter, while Israel鈥檚 investment totals declined slightly.

We鈥檒l keep an eye out in the coming months to see if this divergence of fortunes persists.

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Related reading:

• SA国际传媒 Data: Q3 2026 Posted A Record Count Of Billion-Dollar Rounds As The Global AI Race Heats Up

Methodology

The data contained in this report comes directly from SA国际传媒, and is based on reported data. Data is as of Oct. 5, 2026.

Note that data lags are most pronounced at the earliest stages of venture activity, with seed funding amounts increasing significantly after the end of a quarter/year.

Please note that all funding values are given in U.S. dollars unless otherwise noted. SA国际传媒 converts foreign currencies to U.S. dollars at the prevailing spot rate from the date funding rounds, acquisitions, IPOs and other financial events are reported. Even if those events were added to SA国际传媒 long after the event was announced, foreign currency transactions are converted at the historic spot price.

Glossary of funding terms

Seed and angel consists of seed, pre-seed and angel rounds. SA国际传媒 also includes venture rounds of unknown series, equity crowdfunding and convertible notes at $3 million (USD or as-converted USD equivalent) or less.

Early-stage consists of Series A and Series B rounds, as well as other round types. SA国际传媒 includes venture rounds of unknown series, corporate venture and other rounds above $3 million, and those less than or equal to $15 million.

Late-stage consists of Series C, Series D, Series E and later-lettered venture rounds following the 鈥淪eries [Letter]鈥� naming convention. Also included are venture rounds of unknown series, corporate venture and other rounds above $15 million. Corporate rounds are only included if a company has raised an equity funding at seed through a venture series funding round.

Technology growth is a private-equity round raised by a company that has previously raised a 鈥渧enture鈥� round. (So basically, any round from the previously defined stages.)

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For the third quarter of 2026, global cybersecurity- and privacy-focused startups pulled in a total of $6.8 billion, per SA国际传媒 data. That鈥檚 up about 50% from the prior quarter and tied for the highest quarterly tally in years, as charted below.

The funding bump was due to larger rounds, not more of them. Round counts actually declined sequentially across all stages last quarter, SA国际传媒 data shows.

Biggest cybersecurity fundraisers

AI startups accounted for the overwhelming majority of cybersecurity funding, with a particular focus on identity security. Overall, at least at the intersection of artificial intelligence and cybersecurity closed rounds of $100 million or more this past quarter.

Of those, the largest funding recipient by far was enterprise identity security provider聽 , which picked up $1 billion in a July growth round led by . Founded in 2001, the Ohio company isn鈥檛 exactly a startup, but it has attracted the bulk of its venture funding in the past 10 years and its pivot to AI is also of a more recent vintage.

Dallas-based tied for second place with a $400 million September Series F led by . The startup, which offers tools for enterprises to see and govern how people and AI agents interact with applications and data, also secured a post-money valuation of $6.4 billion.

, operator of an enterprise data security platform focused on AI agents, also announced a fresh $400 million -led investment in September, just three months after raising $600 million. The latest infusion set a $12 billion valuation for the New York startup.

For a bigger-picture view of leading fundraisers, below we used SA国际传媒 data to put together a list of the 10 largest round recipients.

Exits, too

We also saw some good-sized acquisitions of cybersecurity startups this past quarter, even as the IPO market was fairly sluggish.

led the M&A pack with its $2.4 billion purchase of anti-fraud technology provider in August. The acquisition is part of a broader effort by Visa to beef up its fraud detection and prevention capabilities for the AI age.

Among private unicorns, meanwhile, Cyera proved it can find a way to spend a good chunk of the capital it raised. It acquired , an enterprise access management platform built for AI agents, in a deal reportedly valued around $1 billion.

As for public offerings, , which offers digital security services to consumers, was the lone sizable venture-backed market debut. The Boston-based startup completed an acquisition of an Australian public company, , in July, and then renamed the combined company Aura.

Overall, an upbeat quarter

Overall, SA国际传媒 funding data points to an upbeat environment for cybersecurity startup funding. This doesn鈥檛 seem particularly surprising given the steady drumbeat of worrisome news about the risks posed by rapidly advancing AI technology.

It鈥檚 not an especially reassuring time for most of us. But for cybersecurity founders, there鈥檚 certainly an ever-expanding array of hazards to keep at bay. We鈥檒l keep watching in the current quarter to see if investment momentum continues to build.

Related SA国际传媒 queries:

Illustration:

This is a weekly feature that runs down the week鈥檚 Top 10 announced funding rounds in the U.S. Check out last week鈥檚 biggest funding deal roundup here.

As the AI startup boom progresses, investors appear to be leaving few niches unfunded. That was apparent in this week鈥檚 lineup of large funding rounds, which featured AI infrastructure providers, a foundational model developer, a content protection platform for the AI age, and other AI-focused startups among the top investment recipients.

The biggest investment, $2 billion, went to , a spinout focused on cloud and power infrastructure that is hoping to benefit from the AI buildout. Other large rounds went to , developer of a fast-growing new model, and , a quantum computing startup.

1. , $2B, cloud and power infrastructure: Axiom Solutions International, a private cloud and power infrastructure company spun out of manufacturing services provider , secured $2 billion in new financing. and provided the strategic investment by purchasing shares of Austin-based Axiom from Flex at an initial enterprise value of $37.5 billion. Flex says it plans to separate Axiom into an independent publicly traded company early next year.

2. , $870M, foundational AI: TypeSafe AI, developer of Jev, a recently launched AI model with a large and growing early following, raised $870 million in new funding with as the largest investor, according to a . also participated in the round, which reportedly set a $7.5 billion valuation for San Francisco-based TypeSafe.

3. , $475M, quantum computing: Pasadena, California-based Oratomic, a startup working on fault-tolerant quantum computers, raised $475 million in fresh funding led by , , , , and . The company previously raised $300 million in a July financing.

4. , $400M, data and content protection: SignSplit, a provider of tools for protecting, licensing and contributing real-world human data and other forms of human contribution, emerged from stealth with $400 million in seed funding. backed the round, setting a $1 billion valuation for the New York-based company, which was founded in 2024.

5. (tied) , $250M, AI for engineering: Vinci, developer of an AI computational platform for hardware engineers to design products, closed on $250 million in Series B funding at a $1.5 billion valuation. , and led the round for the Palo Alto, California-based company.

5. (tied) , $250M, micro-manufacturing: Emeryville, California-based Atomic Machines, a startup working on AI-native digital manufacturing systems to build micro-machines directly from code, emerged from stealth and said it has raised $250 million to date from a long list of investors.

7. , $225M, energy distribution: Voltus, provider of a distributed energy platform aimed at bolstering grid flexibility, picked up $225 million in Series D funding. , and led the financing for the San Francisco-based startup.

8. (tied) , $200M, fusion: Knoxville, Tennessee-based Type One Energy, a developer of fusion energy technology, secured $200 million in Series B financing led by and .

8. (tied) , $200M, insurance: Ledgebrook, an AI-powered specialty insurance platform, closed on $200 million in equity financing co-led by and . The round brings total funding to date for Boston-based Ledgebrook to around $315 million, per .

8. (tied) , $200M, AI evaluation: Arena, provider of a platform for evaluating AI models, pulled in $200 million in Series B funding and said it has exceeded a $100 million annual revenue run rate. and led the round, which set a $3.1 billion valuation for the company.

Methodology

We tracked the largest announced rounds in the SA国际传媒 database that were raised by U.S.-based companies for the period of Oct. 3-9, 2026. Although most announced rounds are in the database, there may be a small time lag, as some rounds are reported late in the week.