# What Are Nuclear Energy and Uranium Stocks? > Understand nuclear operators, uranium and fuel suppliers, and reactor developers, with the scope and history limits of this curated stock comparison. Source: MarketCapLens — https://www.marketcaplens.com/learn/what-are-nuclear-energy-stocks Updated: 2026-11-11 **Nuclear energy stocks**, on MarketCapLens, are U.S.-listed companies involved in nuclear electricity generation, uranium and fuel supply, or reactor technology and equipment. The [live nuclear energy stocks comparison](https://www.marketcaplens.com/nuclear-energy-stocks) ranks the selected companies by market capitalization and shows their available price and market-cap histories. The nuclear value chain includes electricity generation, uranium mining, fuel processing, components, and reactor development. These are different businesses. An operating power fleet earns revenue today, while a reactor developer may depend on approvals and financing before its planned plants earn revenue. ## Which companies qualify? We select U.S.-listed businesses with a substantial role in nuclear electricity generation, uranium mining or fuel services, nuclear equipment, or reactor development. The list deliberately separates operators, fuel suppliers, and technology developers by business role. Market cap covers the whole listed company, including non-nuclear operations; it is not a valuation of the nuclear segment. Companies must also appear in the current site ranking. The business roles on the live page explain why each member belongs: - **Electricity generation:** [Constellation Energy (CEG)](https://www.marketcaplens.com/company/CEG). - **Uranium & fuel supply:** [Cameco (CCJ)](https://www.marketcaplens.com/company/CCJ), [Centrus Energy (LEU)](https://www.marketcaplens.com/company/LEU), [Uranium Energy (UEC)](https://www.marketcaplens.com/company/UEC). - **Nuclear equipment:** [BWX Technologies (BWXT)](https://www.marketcaplens.com/company/BWXT). - **Reactor development:** [Oklo (OKLO)](https://www.marketcaplens.com/company/OKLO), [NuScale Power (SMR)](https://www.marketcaplens.com/company/SMR). This is a selected comparison, not an exhaustive worldwide industry directory. The [ranking eligibility rules](https://www.marketcaplens.com/learn/how-the-ranking-works) determine which listed companies appear in the current figures. Nuclear operators can also appear in the [Utilities sector ranking](https://www.marketcaplens.com/sectors/utilities), while fuel producers and equipment suppliers may belong to other sectors. A theme can span several sectors. ## What drives these businesses? The fuel chain has several steps. Miners produce uranium; conversion and enrichment prepare it for fuel used by many reactor designs; fuel fabrication turns material into reactor-ready fuel. A company involved in one step does not automatically perform the others. Electricity operators sell power from operating plants. Equipment suppliers sell components and services. Reactor developers may depend on licensing, financing, construction, and customer projects before a proposed reactor produces electricity. Fuel prices, electricity prices, and project approvals therefore affect different members in different ways. A developer can have other revenue, but that is separate from revenue from its planned operating reactors. ## What can the ranking leave out? Regulation, project execution, fuel availability, and financing matter throughout the chain. Early-stage developers can face long timelines and share issuance. Comparing their market caps with an established operator does not imply equal maturity, revenue, or risk. The largest company is not necessarily the cheapest or the most profitable. The [difference between market cap and share price](https://www.marketcaplens.com/learn/market-cap-vs-stock-price) matters here: a low dollar price per share says little about the value of the whole business. ## How to read the figures and charts Market cap measures the whole company’s equity value. The list’s combined cap adds the current values of members present in the ranking; each company’s weight is its cap divided by that total. The historical stack includes companies when usable history begins, so new listings and share-count changes can move the total as well as prices. It is not the return on a fixed portfolio. Price-performance lines use a common starting date and exclude dividends. A 100% increase doubles the starting price; a 200% increase triples it. The live comparison states its dates, included names, and exclusions. Missing history is not a zero return. See [price return versus total return](https://www.marketcaplens.com/learn/price-return-vs-total-return) for what income changes. This collection uses a shared starting date for eligible companies with at least a year of monthly price history. That makes newer listings comparable over the same period without pretending they have five years of returns. Five-year return columns still require the full period. Documented predecessor-company history is excluded where it would misrepresent the current listed business. ## Related comparisons For adjacent businesses, compare [power grid stocks](https://www.marketcaplens.com/power-grid-stocks), [AI supply-chain stocks](https://www.marketcaplens.com/ai-stocks), and [defense stocks](https://www.marketcaplens.com/defense-stocks). A company can qualify for more than one list, so adding their combined market caps would count overlapping companies more than once. The [Featured directory](https://www.marketcaplens.com/featured) explains each list’s scope and links to its live comparison and guide. For general education only. Nothing here is investment advice. ## Frequently asked questions ### What are nuclear energy stocks? U.S.-listed companies involved in nuclear electricity generation, uranium and fuel supply, or reactor technology and equipment. ### Are nuclear energy stocks the same as uranium stocks? No. Uranium suppliers are one part of the nuclear chain. This list also includes electricity generation, fuel services, nuclear equipment, and reactor development. ### Does a reactor developer have the same exposure as an operating utility? No. Developers can depend on licensing, financing, construction, and future commercialization. An operator has an existing electricity business. Whole-company market caps should be read with those differences in mind. ## Sources - [U.S. EIA: stages of the nuclear fuel cycle](https://www.eia.gov/energyexplained/nuclear/the-nuclear-fuel-cycle.php) - [Constellation: separation and regular trading](https://investors.constellationenergy.com/news-releases/news-release-details/constellation-launches-largest-us-clean-energy-company-after/) - [Oklo: trading began May 2024](https://oklo.com/newsroom/oklo-inc-begins-trading-on-the-new-york-stock-exchange) - [NuScale: trading began May 2022](https://www.nuscalepower.com/press-releases/2022/nuscale-completes-merger-with-spring-valley) - [VanEck: nuclear and uranium reference universe](https://www.vaneck.com/us/en/investments/uranium-nuclear-energy-etf-nlr/holdings/) - [VanEck: nuclear value-chain scope](https://www.vaneck.com/us/en/blogs/natural-resources/nlr-etf-question-answer/) References explain the concepts; MarketCapLens supplies the examples and calculator assumptions. See https://www.marketcaplens.com/about for who checks the numbers. ## Related guides - [What are power grid stocks?](https://www.marketcaplens.com/learn/what-are-power-grid-stocks) - [What is a sector?](https://www.marketcaplens.com/learn/what-is-a-sector)