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Investing in a defense contractor with nuclear-related work can expose you to operational liability, government-budget and contract risk, supply-chain disruption, regulatory and compliance costs, and ethical concerns. Those risks vary by company and program. A filing that discloses nuclear activities does not show how much they contribute to revenue, how the market values them, or whether the stock will outperform.
What risks should investors assess?
Operational, liability, and reputation risk
Nuclear-related work can involve hazards beyond ordinary product or delivery risk, including radioactive or other hazardous materials, launch operations, and potential harm to people, property, or the environment. The consequences could include liability, regulatory obligations, and reputational damage. Whether insurance or government indemnification would cover a particular loss depends on the circumstances; such protection may be unavailable or inadequate.
Northrop Grumman’s 2025 annual report says its products and services are used in nuclear-related activities, including nuclear-powered platforms, and in support of third parties’ nuclear-related operations. It identifies risks involving nuclear and non-nuclear launch operations, energetic materials, and the storage, handling, and disposal of radioactive and other hazardous or flammable materials. The company also says indemnification may apply in some circumstances, including under the Price-Anderson Nuclear Industries Indemnity Act, but may not be available or adequate, and insurance may not be reasonably available. These are disclosures of potential risks, not predictions that an incident will occur. Northrop Grumman 2025 annual report
Government spending and program decisions
Defense contractors depend substantially on government procurement, policy, and budgets. Changes in defense spending or national priorities can affect demand, contract timing, or program scope. RTX identifies changes in U.S. defense spending and policy among its risks. This is a risk to the broader business, not evidence that any particular nuclear program will be cut or that nuclear exposure alone determines results. RTX 2025 Form 10-K
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Contract execution, costs, and delivery
Even when a contract is awarded, a contractor must develop, certify, produce, deliver, and support the contracted systems. Delays, cost growth, production problems, or performance issues can affect margins and cash flow. RTX lists challenges in development, certification, production, delivery, support, and product performance, as well as cost control. Investors should examine the specific program and contract terms in the issuer’s filings rather than assume a large award guarantees a particular level of revenue or profit. RTX 2025 Form 10-K
Suppliers, trade restrictions, and export approvals
Contractors may rely on international suppliers and need authorization to move products or technology across borders. Tariffs, sanctions, embargoes, export and import controls, and trade restrictions can raise costs, disrupt supply, or complicate delivery. Lockheed Martin’s 2025 Form 10-K describes these risks for imported materials and components and exported products, including retaliatory tariffs. RTX also identifies supplier and commodity disruption, sanctions, tariffs, and export approvals as risks. The cited disclosures do not quantify the effect specifically on nuclear programs. Lockheed Martin 2025 Form 10-K RTX 2025 Form 10-K
Audits, investigations, and compliance
Government contractors can face audits and investigations. RTX says these can lead to repayment obligations, fines, damages, penalties, license suspension, or suspension or debarment from future U.S. government contracting. These are possible consequences described by the company, not proof of sector-wide misconduct. Review each issuer’s disclosures for current proceedings and their stated status. RTX 2025 Form 10-K
Ethical and investor-screening concerns
Some investors may exclude companies involved in nuclear weapons or engage with them as shareholders. ShareAction’s 2025 report describes resolutions at major weapons companies seeking greater disclosure about lobbying and human-rights impacts. This is stakeholder and investor-governance context, not an SEC finding or evidence of a measurable share-price effect. An investor’s ethical policy can affect whether a holding is acceptable even where the financial impact is uncertain. ShareAction, Voting Matters 2024, published 2025
How to assess a company’s nuclear exposure
Do not treat all contractors as interchangeable. A company may make weapons, support nuclear-powered platforms, provide maintenance or services, supply materials, or have a more indirect role. Check the issuer’s current annual report and program disclosures to establish what it actually does.
- Nature of the work: Identify the company’s role and whether it is direct production, platform support, maintenance, or indirect supply.
- Risk allocation: Review the stated hazards, liability arrangements, indemnification, insurance availability, and regulatory obligations.
- Financial dependence: Examine customer and program concentration, contract duration, and the importance of government business to the company.
- Contract economics: Look for cost growth, schedule changes, production challenges, delivery performance, and contract terms.
- External dependencies: Consider appropriations, procurement priorities, suppliers, tariffs, sanctions, and export permissions.
- Investor mandate: Decide how your policy treats nuclear weapons, human-rights screening, and shareholder engagement.
The reviewed filings do not provide a consistent nuclear-business revenue breakdown for Lockheed Martin, RTX, and Northrop Grumman. They therefore do not support a reliable ranking of those companies by the proportion of revenue attributable to nuclear work.
What the available figures do—and do not—show
ShareAction’s 2025 report gives combined revenues of US$175 billion for Lockheed Martin, RTX, and Northrop Grumman. That is a combined-company revenue figure, not revenue from nuclear businesses. The report also cites a US$13.3 billion Northrop Grumman nuclear missile contract awarded in 2020; that is the contract award value, not annual revenue, profit, or the company’s valuation. ShareAction, Voting Matters 2024, published 2025
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The Treaty on the Prohibition of Nuclear Weapons prohibits each State Party from assisting, encouraging, or inducing activities prohibited by the treaty; it entered into force on 22 January 2021. That treaty language does not establish a universal rule that ordinary share ownership in every contractor is prohibited. The applicable position depends on the relevant state and domestic implementation. Treaty text reproduced in Ireland’s Prohibition of Nuclear Weapons Act 2019; United Nations Treaty Collection status record
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How to use these risks in an investment decision
Company disclosures are a starting point for due diligence, not a forecast of stock performance. Separate three questions: what nuclear-related work the company performs, how financially material that work is, and whether its risks or ethical implications fit your own investment criteria. The cited filings identify possible business and legal exposures, but they do not establish that nuclear work makes a stock more or less profitable.
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