BWX Technologies vs. Rocket Lab: Should You Go Nuclear or Go to Space in Your Portfolio?

Is the reliability of nuclear infrastructure a better bet than the high-stakes growth of the space economy? Investors choosing between BWX Technologies Inc. (NYSE:BWXT) and Rocket Lab USA Inc. (NASDAQ:RKLB) face a classic value versus growth dilemma.

BWX Technologies provides critical nuclear components for national security and clean energy, offering a stable business model backed by massive government contracts. Conversely, Rocket Lab is a disruptive force in launch services, aiming to verticalize the entire space industry. Both companies play vital roles in the evolving landscape for investors today.

The case for BWX Technologies

BWX Technologies designs and manufactures nuclear components for global security and clean energy among defense stocks. In its latest annual report, filed for FY 2025, the company highlighted its work for the U.S. government, which accounted for approximately 68% of total revenue. Customer concentration like this adds a layer of risk to the business. Beyond defense, the company serves nuclear power utilities for maintenance projects and recently shifted focus by agreeing to sell its medical business to Nordic Capital.

In FY 2025, revenue reached $3.2 billion, representing an 18% increase compared to the previous year. This growth trajectory was accompanied by net income of $329.9 million. The company maintained a net margin of 10.3%, which is a measure of how much profit is kept from each dollar of sales. This level of profitability has remained relatively stable over the last three fiscal years.

As of its December 2025 balance sheet, the debt-to-equity ratio is 1.6x. This ratio, which divides total debt by shareholder equity, indicates the extent to which the business is financed through borrowing. Its current ratio stands at 2.3x, showing the company has more than enough short-term assets to cover its short-term liabilities. Free cash flow for FY 2025 was $295.3 million, which is the cash remaining after operating cash flow is used for capital expenditures.

The case for Rocket Lab USA

Rocket Lab provides launch services and satellite infrastructure to a mix of commercial and government clients. Its strategy involves vertically integrating the space industry, ranging from manufacturing spacecraft components to on-orbit management. The company is currently in the process of acquiring Iridium Communications Inc.(NASDAQ:IRDM), a move intended to add a massive satellite network and recurring subscription revenue to its portfolio. Other key customers include NASA and the U.S. Department of Defense.

In FY 2025, revenue reached $601.8 million, marking an impressive 38% growth over the prior period. Despite this top-line expansion, the company reported a net loss of $198.2 million. This resulted in a negative net margin of 32.9%, as the company continues to prioritize scaling its operations. This margin reflects the high costs of research and development for new vehicles like the Neutron rocket.

As of its December 2025 balance sheet, its current ratio is 4.1x. This high ratio suggests the company is well-positioned to meet its short-term financial obligations with liquid assets. The debt-to-equity ratio is approximately 0.1x, reflecting a low level of debt relative to shareholder equity. However, free cash flow for FY 2025 was negative $321.8 million, showing that the company is currently using more cash than it generates from operations and capital investments. Free cash flow measures the cash left over after operating cash flow is used for capital expenditures.

Risk profile comparison

BWX Technologies faces significant risk from its reliance on government contracts, given its primary customer is the U.S. government. Any changes in Congressional appropriations could lead to funding uncertainties or contract terminations as a result. Furthermore, handling special nuclear materials involves complex regulatory oversight and environmental cleanup liabilities. Fixed-price contracts also pose a threat, as any cost overruns cannot be passed to the customer and will directly impact profitability.

Rocket Lab faces significant risks related to its pending $8 billion acquisition of Iridium Communications. This large transaction creates concerns about potential equity dilution and the complexities of integrating a massive satellite network. Operational failures also remain a threat, as any technical anomalies with the Electron or Neutron vehicles could damage customer relationships. The company also competes with established giants like Lockheed Martin Corp. (NYSE:LMT) and Northrop Grumman Corp. (NYSE:NOC) in a rapidly evolving technological field.

Valuation comparison

BWX Technologies is the value choice based on Forward P/E (future earnings estimates), while Rocket Lab's P/S ratio compares price to sales over the past twelve months.

Metric	BWX Technologies	Rocket Lab
Forward P/E	28.6x	191.8x
P/S ratio	3.5x	41.2x

Valuation metrics include data sourced from Financial Modeling Prep (FMP) and may differ from other data providers.

Which stock would I buy in 2026?

Rocket Lab made a huge splash in the market with its proposed $8 billion acquisition of Iridium Communications this year. The combination promises to make Rocket Lab a space powerhouse by integrating its launch technology with Iridium's communications spectrum. In short, Rocket Lab could very well be a serious competitor to SpaceX, as Space Exploration Technologies (NASDAQ:SPCX) is known. Don't overlook Rocket Lab's expertise in sending small payloads into orbit, and it is closing in on the same reusable rocket technology that SpaceX has used to lower its customer prices.

Stand-alone Rocket Lab is seen boosting its revenue by more than one-third this year to about $961 million and narrowing its net loss to about $170 million. The Iridium acquisition is a big pill to swallow, but the combined business should generate $1.4 billion in revenue in 2027 and give investors a modest net profit.

Nuclear power, meanwhile, is undergoing a renaissance in the U.S. that began during the Biden administration, when the energy department commissioned new reactor designs to encourage the development of quicker-to-build and even deployable reactors for remote towns and military bases. The more recent spike in energy demand from data centers is only adding tailwinds to the movement. BWX Technologies is a prime beneficiary of all that. It is also an essential partner to the U.S. military. That relationship will continue for some time, with the Navy announcing a 30-year schedule to regularly build new attack submarines and Ford-class aircraft carriers, all of which use BWX nuclear reactors.

For 2026, BWX should see more than $600 million in additional revenue, posting about $3.8 billion in sales and $403 million in net income, up about 30% year over year.

Space infrastructure is intriguing, but Rocket Lab comes at a premium given its ratios. BWX is an essential contractor for the U.S. Navy and for the domestic energy industry. It comes at much more reasonable P/E and P/S ratios. BWX Technologies is the stock to buy.

Brendan Coffey has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends BWX Technologies, Lockheed Martin, Northrop Grumman, and Rocket Lab. The Motley Fool has a disclosure policy.