Modular Nuclear Reactor (SMR) Developers: 37 SMR, Microreactor and Advanced Reactor Developers with Design, Type, Capacity and NRC/ONR Status (Partial List, Sources Linked)
37 organisations developing small modular reactors, microreactors or other advanced reactor designs, one row per developer (US 18, plus developers in the UK, Italy, Finland, Sweden, Denmark, France and Argentina). Each row gives the design name(s), reactor type and capacity exactly as the source states them, the US NRC status (pre-application, construction permit application, construction permit, standard design approval) with dates and docket numbers, the UK ONR Generic Design Assessment step where applicable, US DOE awards (Reactor Pilot Program, ARDP, Gen III+ SMR), up to three announced deployments, the website, and the source URLs with the exact wording relied on. 30 rows carry an NRC status, 3 a UK GDA status, 17 a DOE selection or award, and 10 a stock listing checked against the SEC company record. Built from NRC and DOE pages (US federal), SEC filings, UK ONR pages and reports, and developers' own websites, read on 2026-10-12. No single official list of SMR developers exists; this is not a complete list (excluded candidates and reasons are listed).