As of March 2026, there are 16 publicly traded nuclear and SMR-related stocks spanning reactor developers, uranium miners, enrichment companies, nuclear services providers, and utilities. The pure-play SMR developers include Oklo (NYSE: OKLO), backed by Meta's 1.2 GW commitment; NuScale Power (NYSE: SMR), the only NRC-certified SMR; and Nano Nuclear Energy (NASDAQ: NNE), developing HTGR microreactors. Centrus Energy (NYSE: LEU) is the only US HALEU producer. Constellation Energy (NASDAQ: CEG) operates the largest US nuclear fleet and is restarting Three Mile Island for Microsoft. The nuclear sector has been one of the strongest-performing themes in public markets since 2023, driven by AI data center power demand and government policy support.
| TICKER | COMPANY | EXCHANGE | CATEGORY | FOCUS / REACTOR TYPE | STATUS |
|---|---|---|---|---|---|
| OKLO | Oklo Inc. | NYSE | SMR Developer | Sodium-cooled fast reactor | Trading |
| SMR | NuScale Power | NYSE | SMR Developer | Pressurized water reactor | Trading |
| NNE | Nano Nuclear Energy | NASDAQ | SMR Developer | HTGR microreactor | Trading |
| LTBR | Lightbridge Corporation | NASDAQ | Fuel Technology | Advanced fuel technology | Trading |
| LEU | Centrus Energy Corp | NYSE | Enrichment | HALEU/LEU enrichment | Trading |
| CCJ | Cameco Corporation | NYSE | Uranium Mining | — | Trading |
| UEC | Uranium Energy Corp | NYSE | Uranium Mining | — | Trading |
| DNN | Denison Mines Corp | NYSE | Uranium Mining | — | Trading |
| NXE | NexGen Energy Ltd | NYSE | Uranium Mining | — | Trading |
| UUUU | Energy Fuels Inc | NYSE | Uranium Mining | — | Trading |
| CEG | Constellation Energy | NASDAQ | Nuclear Utility | Largest US nuclear fleet; TMI restart | Trading |
| VST | Vistra Corp | NYSE | Nuclear Utility | Nuclear fleet operator | Trading |
| TLN | Talen Energy | NASDAQ | Nuclear Utility | Susquehanna NPP operator | Trading |
| GEV | GE Vernova | NYSE | Nuclear Services | BWRX-300 designer/manufacturer | Trading |
| BWX | BWX Technologies | NYSE | Nuclear Services | TRISO fuel, naval reactors, microreactors | Trading |
| FLR | Fluor Corporation | NYSE | Nuclear Services | Nuclear EPC services | Trading |
| — | Holtec International | — | SMR Developer | PWR SMR (SMR-300) | IPO Filed |
| IMSR | Terrestrial Energy | — | SMR Developer | Integral Molten Salt Reactor | Pre-Listing |
Pure-play SMR developer stocks are the highest-risk, highest-reward category in nuclear investing. These companies are designing and plan to build next-generation reactors but have no operating reactor revenue. Their valuations are driven by partnerships, regulatory milestones, and market sentiment toward nuclear energy.
Uranium mining stocks provide upstream exposure to nuclear energy growth. Unlike SMR developers, these companies have existing revenue from uranium production and sales. They benefit from rising uranium spot prices, new reactor demand, and geopolitical supply constraints including the US ban on Russian enriched uranium.
Enrichment and fuel technology companies sit at the critical midpoint of the nuclear supply chain. Centrus Energy is the only US HALEU producer and the most direct play on advanced reactor fuel demand. Lightbridge is developing advanced metallic fuel technology that could improve economics for existing and new reactors.
Nuclear services companies provide the engineering, manufacturing, and construction capabilities that reactor developers need. GE Vernova designs the BWRX-300 (under construction at Darlington, Canada). BWX Technologies manufactures TRISO fuel and naval reactor components. Fluor provides nuclear EPC (engineering, procurement, construction) services.
Nuclear utility stocks offer lower-risk exposure to the nuclear renaissance. These companies operate existing nuclear fleets and benefit from rising power prices driven by AI data center demand. Constellation Energy is restarting TMI Unit 1 for Microsoft. Vistra and Talen Energy operate nuclear plants near major data center markets.
Nuclear ETFs offer diversified exposure to the sector without single-stock risk. URA and URNM focus on uranium miners. NLR includes utilities and services. NUKZ specifically targets the nuclear renaissance theme including SMR developers.
| TICKER | ETF NAME | FOCUS | EXPENSE RATIO |
|---|---|---|---|
| URA | Global X Uranium ETF | Uranium miners and producers globally | 0.69% |
| URNM | Sprott Uranium Miners ETF | Pure-play uranium miners, higher concentration | 0.85% |
| NLR | VanEck Uranium+Nuclear Energy ETF | Utilities, services, and uranium companies | 0.61% |
| NUKZ | Range Nuclear Renaissance Index ETF | Nuclear renaissance companies including SMR developers | 0.85% |
The nuclear stock universe spans a wide risk spectrum. Pure-play SMR developers (OKLO, SMR, NNE) are pre-revenue and speculative — their valuations depend on execution against multi-year construction timelines. Uranium miners (CCJ, UEC, DNN) offer commodity exposure with existing revenue. Enrichment plays like Centrus Energy (LEU) sit at the critical HALEU bottleneck. Nuclear utilities (CEG, VST, TLN) are the lowest-risk way to gain nuclear exposure, with existing cash flows from operating plants plus upside from AI data center power demand. For diversified exposure, nuclear ETFs (URA, URNM, NLR, NUKZ) spread risk across the sector. The key catalyst for all nuclear stocks remains the same: will the first wave of advanced reactors actually get built on time and on budget? TerraPower Natrium (2030), Kairos Hermes (2027), and the TMI restart (2027) are the milestones that will determine whether nuclear valuations are justified.
Disclaimer: This page is for informational purposes only and does not constitute investment advice. SMR.INTEL does not recommend buying or selling any securities. All investments carry risk, and SMR stocks are particularly speculative given the pre-revenue nature of most reactor developers. Always conduct your own research and consult a qualified financial advisor before making investment decisions.