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El Segundo, CA, USA · Private · radiantnuclear.com
Portable gas-cooled microreactor (Kaleidos)
Open roles
19
▼ 15 since 2026-10-30
Federal awards
$2.6M
3 grants, contracts, loans
Last private raise
$269M
Form D · 2025-12-15
SEC filings
5
latest 2025-12-30
Coming up
POLICYRussian uranium import ban: waiver period
DOE can grant waivers for Russian enriched uranium until Jan 1, 2028; after that the ban is absolute. Affects Fission.
+ THESISPOLICY45Y / 48E: all other clean power and storage
Full credit for projects beginning construction through 2033; 75% for 2034 starts, 50% for 2035, none from 2036. Affects Fission.
+ THESISHIRING19 open roles (-15 since Oct 30, 2026)
Biggest teams: Product 12, Finance 3, Infrastructure Operations 2, Engineering 1.
+ THESISCONTRACTAntares, Last Energy, and Radiant hit DOE authorization milestones
ANS Nuclear Newswire: The month of October saw three of the original Reactor Pilot Program companies hit a handful of milestones as each pursues Department of Energy authorization for the operation of various reactor projects. Both Last Energy and Radiant earned documented safety analyses (DSAs) for t…
ans.org →+ THESISDOE · KALEIDOSDOE authorized
DOE approved Radiant's safety analysis for Kaleidos full-power operation at INL's DOME on October 29, 2026, and Radiant is next due for a DOE readiness review before fueling and starting the five-phase test. Separately, the NRC docket for Kaleidos (99902106) remains at pre-application, with the NRC's separate Part 70 review covering Radiant's R-50 fuel facility in Oak Ridge, not a Kaleidos reactor application.
radiantnuclear.com →+ THESISPOLICYDOE Energy Dominance Financing: Constellation and Alliant
Up to $5B conditional loan to Constellation for nuclear uprates (~1.1 GW) and a closed $5.1B loan to Alliant for gas, storage and upgrades (~2.6 GW). The office (formerly the Loan Programs Office) has over $300B of authority. Affects Fission.
+ THESISPOLICYDOE adds helium to the Critical Material List
DOE added helium to its Critical Material List, citing semiconductors, natural-gas leak testing and quantum computing. Helium also cools fusion magnets and high-temperature gas reactors. Affects Fission.
+ THESISPROJECTRadiant Industries chosen for naval station deployment
ANS Nuclear Newswire · mentions Kaleidos: On Wednesday, the Department of the Navy announced that it has selected Radiant Industries to design, build, and deliver a “prototype microreactor power plant” featuring the company’s Kaleidos design for the Naval Weapons Station Crane in Indiana.
ans.org →+ THESISOTHERRadiant microreactor selected for deployment by US Navy
World Nuclear News · mentions Kaleidos: The US Navy has selected Radiant's Kaleidos microreactor for deployment at Naval Weapons Station Crane, Indiana.
world-nuclear-news.org →+ THESISPROJECT · KALEIDOSFirst TRISO fuel delivered to INL
Idaho National Laboratory (DOME), ID
radiantnuclear.com →+ THESISPOLICYDOE Energy Dominance Financing: 10 large reactors
Up to $17.5B in conditional loans for ten Westinghouse AP1000 reactors at five sites; partners must commit $1B equity per project. Utility selections expected in the second half of 2026. Affects Fission.
+ THESISHow it works
Fuel is packed in tough ceramic-coated particles (TRISO), often in billiard-ball pebbles, and cooled by helium gas. Runs much hotter than water reactors, which suits industrial heat.
OPEN IN 3D →Others on this approach
ProofFirst TRISO fuel delivered to INL for the Kaleidos microreactor testJul 1, 2026yahoo.com
NextKaleidos test in INL's DOME facility
Supply-chain security
Secured · Contracted · At risk · Unknown — rated only on public evidence; Unknown means nothing has been disclosed.
Sources: company job boards (daily), SEC EDGAR, USAspending.gov, and the reviewed technology spreadsheets. Public records only cover US entities, so foreign companies and private firms that don't file will show gaps.
Read from SEC 8-Ks (bankruptcy, default, delisting, restatement, impairment, restructuring), cash runway in annual reports, Form D raises and the 30-day hiring trend. A prompt to look closer, not a credit rating.
2026-10-302026-11-09
Teams moving over 30 days: Engineering -5 (now 1), Infrastructure Operations -3 (now 2), People -2 (now 0)
By team
By location
Companies file a Form D within 15 days of selling shares privately. “Sold” is the amount raised so far in that offering; amended notices (D/A) update earlier ones.
| First sale | Notice | Offered | Sold |
|---|---|---|---|
| 2025-12-15 | D · filed 2025-12-30 | $350M | $269M |
| 2025-02-13 | D · filed 2025-06-10 | $66M | $66M |
| 2024-10-23 | D · filed 2024-11-15 | $100M | $100M |
| 2023-04-04 | D · filed 2023-04-18 | $45M | $41M |
| 2022-02-18 | D · filed 2022-03-03 | $13M | $13M |
Matched recipient: RADIANT INDUSTRIES, INCORPORATED
STEP 4/6 · AT RISK HALEU is the bottleneckMost advanced designs need HALEU (5–20% enriched), with no commercial US supply at scale yet.
STEP 4/4 · WATCH Office relaunched as Energy Dominance FinancingLending shifts toward nuclear and utility expansions (AP1000 offers, Constellation uprates).
Critical inputs
Policy that applies
No minerals, policies or partners linked yet. Add them in the review spreadsheet.
2026-11-02 · contract
Antares, Last Energy, and Radiant hit DOE authorization milestonesANS Nuclear Newswire: The month of October saw three of the original Reactor Pilot Program companies hit a handful of milestones as each pursues Department of Energy authorization for the operation of various reactor projects. Both Last Energy and Radiant earned documented safety analyses (DSAs) for t…2026-10-29 · other
Radiant Achieves Industry Milestone as the Only Microreactor Design to Secure DOE Safety Analysis Approval for Full Power OperationsBusiness Wire (energy)2026-10-23 · project
Radiant Industries chosen for naval station deploymentANS Nuclear Newswire · mentions Kaleidos: On Wednesday, the Department of the Navy announced that it has selected Radiant Industries to design, build, and deliver a “prototype microreactor power plant” featuring the company’s Kaleidos design for the Naval Weapons Station Crane in Indiana.2026-10-22 · other
Radiant microreactor selected for deployment by US NavyWorld Nuclear News · mentions Kaleidos: The US Navy has selected Radiant's Kaleidos microreactor for deployment at Naval Weapons Station Crane, Indiana.Only Form D notices on file (shown at left).