3 Nuclear Microreactor Stocks Retail Investors Are Watching After New US Defense Funding

Nuclear microreactors have quietly moved from science project to serious infrastructure option as the U.S. Department of Defense and NASA push fresh funding into compact reactors for bases and space. That shift creates a new set of potential winners and risks for your portfolio. This article breaks down three stocks exposed to this news and shows how each might fit, or not fit, into your own long term view on advanced nuclear.

The stocks covered below are just a sample, and the full screen pulled out 12 more U.S. advanced nuclear and microreactor related companies with similarly detailed narratives that are not in this article.

Head straight into the Advanced Nuclear & Microreactor Developers screener to identify, compare, and analyze the highest conviction advanced nuclear ideas for your own watchlist.

BWX Technologies (BWXT)

Overview: BWX Technologies manufactures nuclear reactors, fuel, and components for U.S. defense, space, and commercial power customers, tying directly into advanced nuclear and microreactor development.

Operations: BWX Technologies generates about US$2.4b from Government Operations and US$1.1b from Commercial Operations, with most revenue sourced in the United States and Canada.

Market Cap: US$11.7b

BWX Technologies matters for this advanced nuclear screen because it already supplies the reactors, fuels, and components that many emerging microreactor projects depend on, which puts real contract visibility behind the theme.

"Record backlog of about US$8.4b, supported by a trailing 12 month book to bill ratio of 1.7x and roughly nine quarters of revenue coverage, is expected to support continued conversion of awarded work into higher revenue and earnings for BWX Technologies."

The key variable is how emerging microreactor and advanced fuels initiatives ultimately affect margins and long term cash generation.

If that cash story is what you care about most, read the full narrative for BWX Technologies to see how contract momentum, capital needs, and risk could be decoupling.

Deep Fission (FISN)

Overview: Deep Fission develops small modular nuclear reactors installed about a mile underground to provide carbon free power for utilities, data centers, heavy industry, government and military users.

Market Cap: US$135 million

Deep Fission sits closer to the pure microreactor bullseye than most companies in this screen. Its entire pitch is built around compact underground units that line up almost directly with what defense planners, space agencies, and energy hungry data centers are now openly funding.

"The 25-year Master Energy Purchase Agreement at the Great Plains Industrial Park, which includes an initial pilot reactor of up to 5 MWe and a contemplated buildout to around 150 MWe in 2028 with a longer term path to 2 GWe, creates a path for Deep Fission to scale contracted power sales that could materially lift long-term revenue visibility."

The key risk is what happens if a single assumption inside that long contract stack shifts the timing or economics of those reactors.

If that contract stack is what you keep circling back to, the full narrative for Deep Fission explains how Deep Fission’s risks and upside could be changing beneath the surface.

Fluor (FLR)

Overview: Fluor provides engineering, procurement, construction, modularization, and project management services worldwide, including work tied to nuclear power and small modular reactors.

Operations: Fluor generates about US$10.3b from Urban Solutions, US$2.6b from Energy Solutions, and US$2.6b from Mission Solutions across global markets.

Market Cap: US$5.9b

Fluor matters for this advanced nuclear screen because its EPC and modularization experience puts it in a strong execution position when SMR concepts shift into the build phase.

"Fluor's active cash management and large share repurchase program has moved forward with over US$2.4b of divestiture proceeds and a plan to repurchase about US$1.4b of stock in 2026, while the growing nuclear offering across SMRs, enrichment, national security and cleanup provides additional potential backlog and earnings contributions."

What happens to future margins depends on how one less visible project risk in the nuclear and SMR pipeline ultimately develops.

If that hidden project risk is on your mind, read the full narrative for Fluor to see how Fluor’s nuclear pipeline could be reshaping long term earnings power.

Seeking Alternatives Beyond Nuclear Microreactors

Fresh ideas move first. Slow ideas get caught chasing momentum. Scan these screens while they are still under the radar for now. Do not delay. Get in early.

• Spot cash generative compounders early by running a pass through the list of solid balance sheet and fundamentals (24 results) before everyone else starts talking about them.
• Target cash flow backed payouts by scanning the 5 dividend fortresses while yields still look attractive and prices have not fully caught up.
• Ride the build out of next generation data and compute by checking the 55 AI infrastructure stocks before capital floods in and compresses the opportunity.

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