The listed SMR universe
| Company | Ticker | Reactor / Role | Capacity | Mkt cap |
|---|---|---|---|---|
| GE Vernova | GEV | BWRX-300 (GE Hitachi) | 300 MWe | $277B |
| Rolls-Royce Holdings | RR.L | SMR (PWR) | 470 MWe | $172B |
| Cameco | CCJ | Uranium fuel / micro | ~330 MWe | $43B |
| Oklo | OKLO | Aurora fast reactor | 15–100+ MWe | $8.4B |
| X-energy | XE | Xe-100 HTGR | 80–320 MWe | $5.8B |
| NuScale Power | SMR | VOYGR (PWR) | 77–924 MWe | $3.9B |
| Nano Nuclear Energy | NNE | HTGR micro | 15 MWe | $1.0B |
| BWX Technologies | BWXT | Nuclear components / micro | — | — |
| Centrus Energy | LEU | HALEU / LEU fuel | — | — |
Source: Green Stocks Research (market caps as of Aug 12, 2026) · Markets Daily (Aug 24, 2026 screener)
Developer picks (pure-play SMR)
NuScale Power (NYSE: SMR)
The first SMR design to receive U.S. NRC design approval in 20 years (US460 standard design approved). VOYGR plants house up to 12 modules at 77 MWe each. Target market: electricity, district heating, desalination, hydrogen. Source: Markets Daily · NRC
Oklo (NYSE: OKLO)
Developing the Aurora fast reactor (15–100+ MWe) using metallic fuel with HALEU or recycled fuel; three business segments: Oklo Power, Oklo Fuel and Oklo Isotopes. Has 1.2 GW advanced nuclear campus commitment with Meta in Ohio (first reactors targeted 2030). Source: Green Stocks Research · Informed Clearly
X-energy (Nasdaq: XE)
Xe-100 HTGR (80 MWe/module, 320 MWe 4-pack), backed by Amazon’s $700M investment and a DOE ARDP award up to $1.2B. Operates TRISO-X, the first NRC-licensed commercial TRISO fuel fabrication facility. 11.5 GW commercial pipeline with Centrus HALEU supply secured. Source: Green Stocks Research · X-energy
Enablers & picks (fuel, components, industrials)
Centrus Energy (NYSE: LEU)
The HALEU bottleneck play: sole NRC-licensed U.S. HALEU producer, $900M DOE contract (up to $1.07B), 1,900+ kg produced, $3.8B total backlog (Dec 2025). Source: Power Magazine · Centrus Q4/FY2025 results
BWX Technologies (NYSE: BWXT)
Nuclear components, naval reactors and fuel fabrication; commercial SMR/microreactor programs; selected for the U.S. Army’s Janus microreactor program (up to $2.2B across five companies). Source: Markets Daily · Janus program coverage
GE Vernova (NYSE: GEV)
BWRX-300 via GE Hitachi Nuclear Energy; largest listed energy equipment player with direct SMR line. Source: Green Stocks Research
Catalysts to watch
- NRC/regulatory milestones — design certifications, construction permits, COLAs.
- New data center offtake deals — hyperscalers adding SMR capacity (see nuclear for data centers guide).
- HALEU ramp — Centrus commercial production timing (see supply chain tracker).
- First-of-a-kind construction — Kemmerer (Natrium), Oak Ridge, Ohio campuses moving dirt.
- Janus microreactor awards — $2.2B U.S. Army program across five companies (Antares, BWXT, GA-EMS, Radiant, Westinghouse). Source: Janus program coverage
Risk notes
- First-of-a-kind units are expensive — SMR cost advantages only materialize at “Nth-of-a-kind” replication scale.
- Licensing delays and fuel availability can push first power years out.
- High short interest (Oklo and NuScale each ~18% of float shorted) means elevated volatility. Source: Sina Finance / 智通财经
This page is independent market intelligence, not investment advice. Sources: Green Stocks Research · Markets Daily · Sina Finance / 智通财经 · X-energy