What are the latest funding trends in advanced nuclear?

All funding deals in the advanced nuclear market over the last years

Below is the table listing all the deals. You can find our methodology at the end of this page.

If you want a deeper understanding of the market and its current dynamics, get our report covering the advanced nuclear market.

Is advanced nuclear funding really booming right now?

Advanced nuclear funding is clearly stronger today, but almost all of the acceleration is happening in the biggest rounds.

We counted 20 financings across 17 companies in the current comparable period, up from 17 deals across 15 companies a year earlier and 15 deals across 12 companies two years earlier. So activity has genuinely picked up. More companies are raising money.

The dollar increase is much bigger. Known equity funding reached at least $2.224 billion, versus $1.256 billion in the previous comparable period and $293.7 million two years earlier. That is a 77% year-on-year increase.

Yet the typical round barely moved. The median rose from $19.0 million to $19.9 million. The average jumped from $73.9 million to $117 million because the upper end of the market has become much larger.

There is one important uncertainty around Valar Atomics. We record its earlier $340 million equity financing and later $1 billion Series B separately, following the announced transactions, but reporting around the later round leaves open the possibility that part of the earlier capital is included in the $1 billion figure. Even with a conservative overlap adjustment, funding remains well ahead of last year. The size of the increase changes; the direction does not.

Metric	Current YTD	Previous YTD	Two years earlier	Current vs previous
Deals	20	17	15	+17.6%
Unique companies	17	15	12	+13.3%
Known equity capital	≥$2.224B	$1.256B	$293.7M	+77.1%
Median known round	$19.9M	$19.0M	$7.7M	+4.7%
Average known round	$117.0M	$73.9M	$19.6M	+58.4%
Largest round	$1.0B	$650M	$94.1M	+53.8%
$100M+ rounds	4	3	0	+1
Funded companies	17	15	12	+13.3%

Would advanced nuclear funding still look strong without the huge rounds?

No. Once we remove the largest advanced nuclear rounds, the year-on-year funding increase disappears.

Capital from rounds of $50 million or less is at least $218.7 million, down 9% from $240.7 million in the previous comparable period. Using a $100 million cutoff gives the same answer: current capital is at least $373.7 million, roughly 8% below last year.

That changes how we should read the headline.

Valar's $1 billion financing, Antares' $370 million equity round, Valar's earlier recorded $340 million equity financing and Standard Nuclear's $140 million Series A created a funding layer that barely existed two years ago. Four current deals above $100 million absorbed about 83% of known capital.

At the same time, the largest single deal is actually less dominant than last year's biggest transaction. Valar's $1 billion represents about 45% of current capital, whereas TerraPower's $650 million raise represented more than half of comparable 2025 funding.

The concentration has spread across several large winners. The five biggest transactions now account for roughly 87% of known capital.

For founders raising ordinary $10 million to $40 million rounds, the market currently looks much closer to last year than the $2.2 billion headline suggests.

Are more advanced nuclear startups actually getting funded?

Yes, advanced nuclear funding has become somewhat broader, with more deals and more funded companies than in either of the previous comparable periods.

We found 17 funded companies today, compared with 15 last year and 12 two years ago. Deal count increased from 17 to 20 year on year.

That is meaningful growth, but it is modest next to the increase in dollars.

Some of the extra activity also comes from companies financing themselves more than once. Valar appears twice in the current period. LIS Technologies raised twice. Bluecore Energy came out of stealth with an initial financing and then returned with another announced round shortly afterward.

So investors are funding a slightly larger group of companies, while the biggest change is how much they will commit once they decide a company deserves a scale-up round.

Are advanced nuclear rounds generally getting bigger?

Typical advanced nuclear rounds are only a little bigger today; the spectacular increase is almost entirely at the top.

The median known round is $19.9 million, barely above last year's $19 million. Two years ago it was $7.7 million, so there has been a real longer-term increase, but nothing close to the sevenfold rise in total capital versus that period.

What has changed is the ceiling.

Two years ago, no comparable-period financing exceeded $100 million. Last year there were three. There are four now, including one at $1 billion and two others above $300 million.

We can see the shift directly in the distribution. The $100 million-plus bucket captures 83.2% of current capital. Meanwhile, deals between $5 million and $20 million remain the most common size group.

That leaves a much more polarized market: plenty of relatively normal venture rounds at the bottom, plus a new class of very large industrial-scale financings at the top.

Why are advanced nuclear investors writing such huge checks now?

Advanced nuclear investors are writing much larger checks because several companies can now point to physical reactor, fuel and deployment milestones rather than relying mostly on future plans.

Antares is a good example. The U.S. Department of Energy announced that its Mark-0 reactor achieved zero-power criticality in 2026 at Idaho National Laboratory. The test gave Antares a physical proof point shortly before the company announced a $470 million financing package, of which we count $370 million as equity.

Valar reached another important milestone when its Ward 250 reactor achieved criticality under the DOE Reactor Pilot Program. Valar says the reactor later generated electricity during a public demonstration, before the company closed its $1 billion Series B led by Sequoia.

Standard Nuclear shows the same shift on the fuel side. Its $140 million Series A came alongside the start of commercial-scale HALEU TRISO fuel production. The company said the money would expand production infrastructure rather than fund an early research concept.

The broader U.S. environment has changed as well. The Department of Energy's reactor pilot effort pushed several privately developed advanced reactors toward criticality during 2026. Aalo, Antares and Valar are all part of that wider move from design work toward hardware and operations.

Investors can now judge some of these companies using evidence that simply did not exist a couple of years ago.

Which advanced nuclear companies are pulling funding upward?

Valar Atomics, Antares and Standard Nuclear explain most of the current advanced nuclear funding surge.

Valar alone represents the biggest concentration of capital. Its later $1 billion Series B is the largest transaction in our current-period dataset, while the earlier $340 million equity financing is also among the top three. As noted above, we preserve the possible overlap rather than pretending the public record is perfectly clean.

Antares adds another $370 million of equity. Standard Nuclear contributes $140 million. newcleo's private financing earlier in the year adds $85 million, while Kairos Power's announced Samsung C&T agreement includes $70 million of direct equity within a broader package of investment and engineering support.

The scale difference is enormous. The top four recorded financings alone represent well over four times the entire comparable-period advanced nuclear funding total from two years ago.

Company	Recorded current financing	Category	Stage
Valar Atomics	$1.0B	High-Temperature Gas Reactors	Series B
Antares	$370M equity	Microreactors	Series C
Valar Atomics	$340M equity	High-Temperature Gas Reactors	Series B
Standard Nuclear	$140M	Advanced Nuclear Fuel	Series A
newcleo	$85M	Lead-Cooled Fast Reactors	Unknown
Kairos Power	$70M direct equity	Molten Salt Reactors	Growth Equity
Bluecore Energy	$50M	Light-Water SMRs	Seed
Jimmy Energy	~$46.6M equity	High-Temperature Gas Reactors	Series B

Are early-stage advanced nuclear startups having a harder time raising?

Early-stage advanced nuclear funding is still happening, but it currently represents a much smaller part of the market.

Seed and Series A deals make up 35% of current financings. That compares with 58.8% last year and 80% two years ago.

We should be careful with the exact stage percentages because six current deals have no reliably disclosed stage. Even so, the direction is hard to miss when we combine stage, round size and company history.

Series B alone accounts for 62.4% of known capital. Antares adds another huge Series C. Only a relatively small amount of current money is reaching companies at their first institutional financing.

Young startups can still raise. Nuclear Turbines secured roughly $19.9 million in its first recorded financing. Bluecore Energy emerged with an initial $10 million raise before announcing a much larger seed round. Apollo Atomics raised $26 million.

What we are seeing these days is a much steeper funding curve between 'interesting new reactor company' and 'company investors believe can actually build at scale.'

Are new advanced nuclear startups getting squeezed out?

New advanced nuclear companies are still appearing, but the funding boom is overwhelmingly benefiting companies that have already raised before.

Only two current financings are classified as first financings, equal to last year's count despite the increase in total activity. Two years ago there were three.

Those two current first financings account for about $29.9 million of known capital. Follow-on financings account for more than $2.19 billion.

That difference is too large to dismiss as normal variation.

Nuclear Turbines and Bluecore show that genuinely new companies can still attract venture money. But investors are committing dramatically more capital to established programs such as Valar, Antares, Standard Nuclear and newcleo.

Our first-financing classification comes from our review of publicly identifiable financing histories, so we use it as a directional measure rather than claiming we can reconstruct every private capital event perfectly.

The direction is still clear: today's extraordinary funding totals come from investors doubling down on companies that have already survived earlier rounds.

Why are high-temperature gas reactors getting so much attention?

High-temperature gas reactors are currently the strongest advanced nuclear funding category because they gained both more deals and much more capital.

HTGRs represent 25% of current deals, up from 11.8% in the previous comparable period. Their share of capital jumped from 17.4% to 63.5%.

Valar drives most of the dollar increase, but the category has more going on than one giant round. Jimmy Energy raised about $46.6 million of equity for its industrial-heat nuclear systems. Nuclear Turbines entered the market with roughly $19.9 million. X-Energy also received another equity investment.

Jimmy's financing is particularly useful because it shows a different commercial angle from Valar. Jimmy is targeting industrial heat rather than simply selling electricity, and its financing combined private equity with separate French state support.

HTGRs also benefit from the buildout of TRISO fuel capacity. That links reactor development with another part of the market that investors are now funding directly through companies such as Standard Nuclear.

Valar still makes the category's current capital share unusually high. We would therefore take the category's growing deal activity seriously while treating its 63.5% share of total dollars as much less stable.

Category	Current deal share	Current capital share	Previous deal share	Previous capital share
High-Temperature Gas Reactors	25.0%	63.5%	11.8%	17.4%
Microreactors	15.0%	17.2%	23.5%	13.2%
Advanced Nuclear Fuel	15.0%	7.4%	17.6%	8.3%
Light-Water SMRs	25.0%	4.4%	5.9%	1.9%
Lead-Cooled Fast Reactors	5.0%	3.8%	5.9%	1.2%
Molten Salt Reactors	5.0%	3.1%	17.6%	4.7%
Sodium-Cooled Fast Reactors	10.0%	0.6%	17.6%	53.2%

Are light-water SMRs becoming a real startup cluster?

Yes, light-water SMRs are currently producing one of the clearest new-company clusters in advanced nuclear, even though the checks remain relatively small.

Five current financings fall into this category, representing 25% of all deals. The comparable share last year was only 5.9%.

The companies are young. Bluecore Energy was founded recently and is developing floating water-cooled SMRs aimed at ports and other power-intensive infrastructure. Apollo Atomics is building compact pressurized-water systems. Applied Atomics is also using established light-water architecture rather than trying to invent a completely new reactor physics concept.

Bluecore is probably the clearest example of how quickly this part of the market is moving. It came out of stealth with an initial financing, then announced another $50 million round shortly afterward.

Yet the whole light-water SMR category represents only 4.4% of current capital.

So light-water designs are attracting founders and venture rounds right now, while the giant scale-up checks are still going elsewhere.

Are microreactors losing momentum?

Microreactors are attracting fewer advanced nuclear deals than last year, but the companies that break through are raising much more money.

Microreactor deal share fell from 23.5% to 15%. Capital share still increased from 13.2% to 17.2%.

Antares explains most of that change. Its $370 million equity Series C came after Mark-0 reached criticality, giving the company a technical milestone that a few years ago would have been extremely unusual for a venture-backed nuclear startup.

The company has kept adding operational evidence since then. Antares announced a multi-year TRISO fuel supply agreement with Standard Nuclear and later received a large government award connected to a space-reactor demonstration.

That combination of reactor testing, fuel supply and mission-specific customers helps explain why one microreactor company can now command a financing measured in hundreds of millions of dollars.

The category looks more selective than weak.

Did investors suddenly lose interest in sodium-cooled reactors?

No, the apparent collapse in sodium-cooled advanced nuclear funding mostly comes from an unusually large comparison deal.

Sodium-cooled reactors represented 53.2% of capital in the previous comparable period and only 0.6% now. That sounds dramatic until we look at TerraPower.

TerraPower raised $650 million last year. That single financing dominated the entire category and more than half of total market capital during the comparable period.

Current sodium-cooled activity includes HEXANA, but at much smaller financing sizes. HEXANA also recently brought Groupe M into its shareholder base through a €2 million strategic investment tied to an existing industrial partnership.

This is a good example of why category capital shares are particularly volatile in advanced nuclear. One construction-scale financing can move an entire reactor category from the top of the market to the bottom a year later.

We saw the same effect two years ago when lead-cooled reactors captured a huge share of capital.

For now, sodium-cooled funding looks quiet rather than abandoned.

Is advanced nuclear fuel becoming a serious investment category?

Yes, advanced nuclear fuel is becoming easier to finance because the market is moving from a future supply-chain problem toward actual production.

Standard Nuclear's $140 million Series A is the standout transaction. The company says it already operates commercial-scale TRISO manufacturing infrastructure and is using the new capital to expand production capacity.

LIS Technologies also raised twice during the current period as it develops laser uranium-enrichment technology for LEU and HALEU.

This part of the market gives investors a different exposure from betting on one specific reactor platform. A reactor-agnostic fuel supplier can potentially sell into several developers if deployment expands.

Recent company activity makes that argument more tangible. Antares announced a multi-year TRISO supply agreement with Standard Nuclear. The Department of Energy has also been running programs aimed at expanding advanced fuel availability alongside its reactor pilot work.

Fuel still represents less capital than the largest reactor categories today. What has changed is the proximity to real manufacturing and real customers.

Are advanced nuclear investors becoming more selective?

Yes, advanced nuclear investors currently look more selective, and the reward for passing that filter has become much bigger.

Several pieces fit together. The share of first financings is low. Follow-ons account for 90% of deals. The median company age at financing increased from about 2.2 years to 3.3 years. Later-stage rounds absorb most of the capital.

Meanwhile, we do not see an explosion in the number of disclosed lead investors. We identified 11 current lead or co-lead investors, the same number as in the previous comparable period.

What has changed is the check size attached to conviction.

Sequoia led Valar's $1 billion Series B. Paradigm and Caffeinated Capital co-led Antares' large Series C. Decisive Point led Standard Nuclear's $140 million Series A. IQ Capital backed Nuclear Turbines, while Silverton Partners led Bluecore's later seed financing.

None of the disclosed current leads appears on more than one deal in our dataset. Capital is therefore being spread across different sponsors, but each sponsor is making a relatively concentrated company-level bet.

It looks increasingly like investors are picking programs they think can reach deployment rather than rushing into anything with 'nuclear' in the pitch deck.

Are strategic investors taking over advanced nuclear funding?

Strategic investors are currently showing up in important advanced nuclear deals, but they have not become more common overall.

We count strategic participation in five current financings, the same number as in the comparable previous period. Their share of deals actually slipped from 29.4% to 25%.

The interesting change is what some of those relationships involve.

Fortum invested €2.1 million into Steady Energy while also agreeing to provide nuclear operations and maintenance expertise. Groupe M invested in HEXANA after its subsidiary had already worked with the company as an industrial supplier. newcleo's strategic backers include companies linked to reactor components and industrial applications.

Kairos Power gives us the clearest recent example. Samsung C&T agreed to provide up to $100 million through direct investment and engineering services, subject to approvals, while working with Kairos on Hermes 2 and future reactor deployment. Kairos said shortly afterward that adding Samsung C&T to its EPC team should improve execution and cost and schedule certainty.

Strategic participation is becoming more useful operationally even though it is not becoming more frequent.

Is AI data-center demand really pushing advanced nuclear funding higher?

AI data-center demand is giving advanced nuclear companies a much stronger commercial story, although we cannot isolate how much of the funding increase comes directly from AI.

The connection has become much more concrete lately.

Valar says its $1 billion financing will help scale standardized plants for artificial intelligence, industrial and national-security power demand. The company also demonstrated its Ward 250 reactor powering Nvidia Blackwell hardware.

Aalo describes its reactors as purpose-built for AI data centers and is developing a plant designed to sit alongside data-center infrastructure. Bluecore is targeting ports and other electricity-hungry infrastructure. Kairos is working toward commercial deployment while its technology is already tied to Google's nuclear-power strategy.

The broader electricity-demand environment helps because nuclear developers can now point to large customers actively looking for firm power, rather than relying purely on long-range forecasts.

Still, the biggest current rounds have something else in common: reactor criticality, manufacturing infrastructure, fuel supply, government testing programs or concrete deployment partners.

AI demand improves the revenue story. Technical progress appears to determine who gets the giant check.

Is the U.S. pulling away from Europe in advanced nuclear funding?

Yes, U.S. Advanced nuclear companies are currently raising much larger private rounds than their European peers.

North America accounts for 70% of current deals and 92.5% of known capital. Europe still has six financings, so there is no shortage of European activity. The gap is mostly about scale.

Valar, Antares and Standard Nuclear alone represent more than $1 billion of U.S. funding. Europe has meaningful financings from newcleo, Jimmy Energy and Nuclear Turbines, but none reaches the same hundreds-of-millions range in our private-funding dataset.

France is one of the stronger European pockets. Jimmy raised €40 million of private equity alongside separate public support, and HEXANA attracted new industrial capital.

newcleo is now a special case because it moved into the public markets. The company completed its business combination and began trading on Nasdaq in 2026, raising gross proceeds that sit outside our private-company funding comparison. That listing also shows how the European financing path can eventually move beyond private venture rounds entirely.

The regional gap remains very large in private capital today, while Europe's most mature companies may increasingly use different financing channels.

Could advanced nuclear funding finish at a record level?

Yes, advanced nuclear funding is already close enough to previous full-year totals that another sizeable financing could push the market well beyond recent years.

Current known capital equals about 86% of the entire previous year's total, even though our primary comparison stops well before year-end. Current deal count is 20 versus 24 during that full previous year.

Compared with the year before that, current funding has already reached roughly 174% of the entire annual total, while deal count is already close to the full-year figure.

We should not annualize those numbers. Advanced nuclear funding is far too lumpy for a straight-line projection. A single reactor financing can add hundreds of millions of dollars in one day.

But the starting point is unusually strong.

Even without another $1 billion deal, one or two large scale-up rounds would be enough to make the final annual capital total stand out historically.

What is actually changing in advanced nuclear funding?

Advanced nuclear funding is getting stronger, more top-heavy and much more focused on companies that can show physical progress.

The biggest change is the arrival of a genuine scale-up financing tier. Rounds above $100 million now account for more than four-fifths of known capital. Two years ago, there were none in the comparable period.

More companies are also raising, so the market has not narrowed to a tiny handful of names. Seventeen companies received funding versus 15 last year and 12 two years ago. The increase in participation is real, just much smaller than the increase in dollars.

As seen above, normal-sized funding has not strengthened in the same way. Capital below the $50 million and $100 million thresholds is slightly lower than last year. A startup raising a normal venture round should therefore not read the headline funding growth as evidence that every part of the market has become easier.

Investors are also putting more money behind companies with proof. Reactor criticality at Antares and Valar, fuel production at Standard Nuclear, and deployment-oriented partnerships at Kairos all point in the same direction. Technical and industrial progress now has a much more obvious financial reward.

HTGRs currently have the strongest category momentum, while light-water SMRs are producing more new startup activity. Microreactors are seeing fewer but much larger financings. The apparent collapse in sodium-cooled funding is mostly a TerraPower comparison effect.

The main caution remains the exact Valar total because of the possible overlap between its recorded financings. That uncertainty can move the headline growth rate substantially. It does not change the broader picture we see today: advanced nuclear investors are willing to commit unprecedented amounts once a company looks capable of moving from reactor development into actual deployment.