Many publicly listed companies are actively developing or constructing small modular reactors (SMRs) and microreactors in 2026, mainly targeting data center and GPU grid markets.

Core publicly listed developers
- NuScale Power (NYSE: SMR): A leading developer focused on factory-made, modular SMRs.
- Oklo Inc. (NYSE: OKLO): Supported by Sam Altman, developing fast neutron fission microreactors.
- GE Vernova (NYSE: GEV): Joint venture with Hitachi to develop BWRX-300, has advanced projects in Canada and plans to deploy in the United States.
- NANO Nuclear Energy (NASDAQ: NNE): Focused on developing portable, ultra-low power microreactors.
- BWX Technologies (NYSE: BWXT): Produces nuclear components and develops microreactors through government contracts.
- Rolls-Royce Holdings (OTC: RYCEY): Actively advancing SMR development in the UK and international markets.
Utilities and energy giants with SMR business footprints
- Constellation Energy (NASDAQ: CEG): The largest nuclear operator in the U.S., has invested in Rolls-Royce SMR.
- Dominion Energy (NYSE: D): Evaluating deployment of SMRs within Virginia.
- Cameco (NYSE: CCJ): A top uranium supplier, also investing in SMR-related technologies.
👉 Key industry trends in 2026 AI data center demand: Tech giants like Amazon and Microsoft are partnering with nuclear energy companies to secure carbon-free power needed for AI.
U.S. military plans: The U.S. Army is partnering with NuScale, Oklo, and others to deploy microreactors by 2028.
Factory mass production model: Moving away from traditional on-site nuclear plant construction, new SMRs are factory-prefabricated and shipped to sites for assembly.