Radiant

We’re very proud to announce we’ve raised more than $300 million in a new round of funding to mass-produce nuclear reactors! This latest capital raise, coming just six months since closing our Series C, will support the scaling of commercialization efforts as we prepare to break ground early next year on our R-50 factory in Oak Ridge, Tennessee that we announced just a couple of months ago. This round, led by @DraperVC and @BoostVC, and including additional financial commitments from current investors, was put together in just a few weeks. “Micro-scaled nuclear, mass produced for the first time ever can transform how the public thinks about nuclear energy,” said @DougBernauer, our CEO and Founder. “This funding enables us to build our factory and keep to our DOME schedule, where we will achieve self-sustained chain reaction on a reactor designed by, built by, fueled by, and operated by Radiant alongside our partners at the @INL.” Today’s news is a capstone on what has been a massive year for the company. Here are just a few of our team's great wins from just the last six months: · We’ve brought on board some of the best and brightest from inside and outside the nuclear industry, including @RitaB66, the former Assistant Secretary for Nuclear Energy, as Chief Nuclear Officer; Dr. Mike Starrett, as Chief Revenue Officer; and almost a dozen VP and Director hires across engineering, manufacturing, and supply chain organizations. · We were selected by the @ENERGY to be the first to test at INL, with testing scheduled to begin this summer – making it the first new U.S. reactor design to be tested at @NRICnuclear's new DOME facility at @INL. · From submission and approval of our Nuclear Safety Design Agreement (NSDA) to submission of our DOE Authorization Request for Kaleidos (DARK) to meet the intent of the Preliminary Documented Safety Analysis (PDSA), we’ve made steady progress on the regulatory front to stay on track for this summer's first test. · We signed the first-ever deal for mass-manufactured nuclear microreactors on a U.S. military base with the @DIU_x and the @usairforce. · We were selected to join the President’s Nuclear Reactor Pilot Program, with the goal of being one of the first to utilize the DOE’s streamlined approval process for deployment of new reactors. · We signed a deal – with deposits – with @Equinix, the world leader in digital infrastructure to purchase 20 reactors. · We were the first reactor company to sign a contract with the U.S. DOE for High-Assay Low-Enriched Uranium (HALEU) fuel for next year’s test at INL. · We signed the first binding commercial contract by a U.S. advanced reactor developer for Western commercial HALEU enrichment services – with @urencoglobal at a ceremony at the U.S. embassy in London. · We announced we will be building the world’s first factory to mass-produce nuclear reactors in a spot where the nuclear industry began: Oak Ridge, Tennessee. The factory, called R-50, is a nod to the historical name of the site and our ambitious mission to scale production to 50 reactors per year within a few years of the beginning of production in 2028. · With delivery of the pressure vessel and the first order of nuclear-grade, American-made graphite extruded in over a decade, we began assembly on our first nuclear reactor – including the Heat Rejection System (HRS) shown above – ahead of startup next summer at INL’s DOME facility. We continue to meet our milestones and remain on track for next year’s startup of our first reactor – the Kaleidos Demonstration Unit (KDU) – at Idaho National Laboratory’s Demonstration of Microreactor Experiments (DOME) facility. Our factory-built, transportable nuclear generators are designed to provide always-on power for defense, disaster response, remote industry, and critical infrastructure—applications where traditional energy systems fall short. Listen to what some of our investors have to say: “Radiant has delivered on their promises every step of the way. Portable nuclear power is going to provide the bulk of our incremental energy in the years to come and Radiant is executing with purpose not just towards turning on their first reactor, but building them at scale in months, not years.” - @TimDraper, Founder and Managing Partner of @DraperVC “Nuclear is the most important opportunity of our lifetime, and no team is as focused on execution as Radiant. They are a force of nature, hitting every milestone on – or ahead – of time.” - @AdamDraper, Partner at @BoostVC “Radiant is delivering a new class of portable, micro-scale nuclear reactors that can provide reliable energy to places where traditional generation simply isn’t feasible. By moving a critical capability from development to real-world deployment, Radiant is building a resilient solution to energy gaps for warfighters operating on the edge. We're proud to back a team building infrastructure that strengthens U.S. energy resilience and mission readiness.” - Mina Faltas, Founder and Chief Investment Officer at @WashingHarbour "This is what the West and its allies needs, and this is the type of team we back. The Radiant team has repeatedly delivered new capabilities, met schedule requirements, and kept costs competitive. The focus is on energy resiliency that moves beyond prototypes to produce measurable operational effects." - Colin Anderson, Founding Partner at @friendsfamilycap and ex-CFO, Palantir "In an industry fueled by more hype than HALEU, Radiant stands out as the exception. The team's ruthless focus on execution and bringing their mission to life through commercial success separate them from the rest of the pack." - @davidu, General Partner at @a16z “Radiant is a leader in the American nuclear startup space, designing reactors essential to our prosperity and security. Radiant’s superb leadership team is laser-focused on execution and regulatory certainty. DCVC is proud of Radiant’s continued success.” - @RachelSlaybaugh, Partner at @DCVC; former Program Director at the Department of Energy’s ARPA-E, where she created the nuclear fission program “Radiant is the most product and execution focused team we have met in the world of new nuclear. In the last six months, they have continued to add world-class hires and are executing at pace towards delivering the first Kaleidos reactor by 2028." - Will Dufton, Partner at @Giant_Ventures "We believe what sets Radiant apart is their regulatory execution. In an industry where timelines often slip by years, Radiant has met DOE milestones on schedule. That's not luck — it's the result of a team that understands how to navigate the hardest part of building a nuclear company." - Hunter Somerville, Partner at @stepstonegroup "We back sharp management teams with the rare ability to deliver at scale. Radiant stands apart as the most compelling and execution-ready platform we've seen in next-generation energy infrastructure." - Grant Hosking, Managing Partner at @AlignVentures As part of this latest capital raise, we also proud and thankful to have received additional investment from @foundersfund , @ARKInvest, Chevron Technology Ventures, and others. For more information on Radiant and the Kaleidos nuclear generator keep following us here on X as we travel on our road to the DOME!

The Kaleidos pressure vessel. See you @inl this summer.

New Nuclear Power!

Hot Core Summer.

Radiant’s core goes hot this summer ☢️

Radiant CEO @DougBernauer on the lessons he learned working at SpaceX and The Boring Company, and reporting directly to Elon Musk: "I would just go and talk to whoever I needed. I'd cross every line possible. I didn't use the right channels of communication. I just pulled all the assets - I'm building a thing, and I'm ignoring everything else. That's still how I operate." "I loved it. It's why I stayed 12 years. It's the coolest mission - make life multi planetary. I left to make a reactor company to make power for that mission still." "I made the first Falcon 9 ground system. Then I made the first two rockets. I traveled around the country testing the first two Falcon 9's that flew. Then I did the first ever rocket with legs." "That was reporting directly to Elon with three other people. We'd go to his desk, and tell him what we were doing. We got so lucky - every time we came to him, we were pretty much like, 'The qual tank passed and it worked, and the schedule's good.' So, he loved it." "Then I was doing The Boring Company and Hyperloop - basically every Elon side project."

This summer: Full-power (not just zero-power critical ) demonstration of @RadiantNuclear’s reactor at @INL

This is as much detail as we can possibly share on our actual nuclear reactor being built, expect more awesome soon!

Coming to @INL this summer!

"The Department of Energy granted approval last week for Radiant Industries’ Kaleidos nuclear microreactor, which would be the world’s first mass-produced microreactor, making it possible to build and bring nuclear facilities online much more quickly..." nationalreview.com/2026/02/how-am…

Radiant gained a new strategic partner: @LockheedMartin chose @RadiantNuclear to invest. July 4th, a new era of nuclear energy begins.

DOME construction is nearing the finish line & @INL will be opening the door to advancing next‑gen #nuclear. First in & coming soon to DOME: @RadiantNuclear's Kaleidos portable nuclear #microreactor. Follow the progress: nric.inl.gov #NuclearReactor #AdvancedNuclear

@RadiantNuclear continues to execute and get recognized by serious players for their differentiated, meaningful accomplishments.

The Defense powerhouse @LockheedMartin just invested in @RadiantNuclear. Game recognize game. LFG ☢️

We’re excited to share that @LockheedMartin has joined us on our mission to mass-produce portable nuclear reactors. This strategic investment further oversubscribes Radiant’s current financing round and adds decades of defense expertise to our team of investors and partners. Lockheed Martin's investment, combined with the almost half a billion dollars we raised last year, reflects our relentless focus on the mission and deepening confidence from both financial and strategic partners in our commercialization strategy. Today's news comes one week after our PDSA was approved by @ENERGY, six weeks since we became the first nuclear startup to generate electric power, seven weeks since we announced our Series D, two months since our first pressure vessel arrived at our headquarters in El Segundo, and a little over three months since we announced we'll build our first factory in Oak Ridge, Tennessee. All this comes ahead of startup of our first reactor this summer at @NRICnuclear's DOME facility at @INL.

As usual, impressed but not surprised that @RadiantNuclear continues to hit their plan. This accomplishment takes years of dedicated, strategic work by incredibly talented people. Thanks to @ENERGY for moving fast while upholding important standards.

Big news for microreactors! We're excited to see the progress being made toward the first reactor test in DOME at @INL.

👇🏽This is HUGE! 👇🏽 @RadiantNuclear has just received the first @ENERGY-approved PDSA for a full-power test under DOE's new authorization pathway!! We are excited to make history with @INL in @NRICnuclear's DOME!

Earlier today, @ENERGY approved our Preliminary Documented Safety Analysis (PDSA) – the first granted for a full-power test under the DOE's new authorization pathway. This keeps us on track for start up of our first reactor this summer at @INL’s new DOME facility! 🎉 The approval of our submission, which we call the DOE Authorization Request for Kaleidos (DARK), closes out the second of three nuclear safety document submissions in DOE’s new Authorization Pathway for Nuclear Facilities, paving the way towards reactor startup.

I’m @RadiantNuclear right now. The future is epic. It’s so inspiring to see impressive people all aligned on an ambitious goal.

We're honored to be included on Upfront Ventures' 2025 LA Hard Tech 50 list -- and especially honored to be one of only seven unanimous selections!