AOS vs XE: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of September 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.

The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. AOS and XE share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.

This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined AOS and XE exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.

A. O. Smith is a Milwaukee-based manufacturer of water heating and water treatment products. Its core business is residential and commercial water heaters and boilers, where it is one of the top players in North America alongside Rheem and Bradford White, plus a faster-growing line of water treatment and filtration products. The North America segment drives roughly 78 percent of sales, and the Rest of World segment (around 22 percent, a majority in China, with a rising India contribution via the Pureit brand) is the international lever. Much of North American demand is non-discretionary replacement of failed units, which gives the revenue base a defensive, recurring quality.

Full AOS guide

X-Energy, Inc. designs advanced small modular nuclear reactors and manufactures the fuel that powers them. Its flagship Xe-100 is a high-temperature gas-cooled reactor sized at roughly 80 megawatts of electric output (200 megawatts thermal), aimed at industrial sites and data centers, and its TRISO-X fuel business makes the coated-particle fuel the reactors run on. Founded in 2009 and headquartered in Rockville, Maryland, the company is developing its first Xe-100 plant at Dow's Seadrift site on the Texas Gulf Coast under the U.S. Department of Energy's Advanced Reactor Demonstration Program, and has offtake and partnership arrangements tied to Amazon, Dow, Centrica, Talen Energy, and utilities in Kentucky.

Full XE guide

Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.

• AOS drivers: North American replacement demand; Water treatment and India (Pureit).
• XE drivers: AI and data-center power demand; Government backing and the Dow demonstration.

A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: China remains the biggest swing risk, with Rest of World sales pressured by a double-digit China decline that can mask North American strength. For XE, x-Energy is pre-commercial, so it generates large losses and has no proven history of building and operating reactors at scale.

Growth-minded investors who believe the theme has years to run tend to accept the richer multiple for more upside; value-minded investors lean toward the cheaper forward earnings and steadier profile. Pick AOS if you believe its drivers more; XE if you believe its. Many investors hold both, but since they share themes, that is a concentrated bet, not diversification. Decide deliberately and check overlap. For the full detail, see the AOS and XE guides.

AOS. AOS trades like a quality industrial, with a P/E broadly in the mid-to-high teens depending on the price and earnings basis used. Q1 2026 revenue of about $946 million fell roughly 2 percent year over year and EPS of $0.85 missed, driven by China weakness and a plant disruption, which led management to lower the full-year outlook. The dividend has been raised for more than 30 straight years at a payout ratio in the mid-30s percent.

XE. As of July 2026, X-Energy trades at a very high multiple of its modest revenue because the market is pricing future reactor deployments rather than current results. Q1 2026 revenue and grant income roughly doubled year over year to about $43 million, but losses remain large as the company invests in licensing, fuel facilities, and its first plant. The April 2026 IPO added roughly $1.1 billion of cash, funding operations toward its demonstration milestones.

Headline figures (approximate, July 2026): AOS shows revenue (ttm) ~$3.8B, net income (2025) ~$525M, diluted eps (2025, record) ~$3.85, 2026 adj. eps guidance ~$3.70-$4.00; XE shows share price ~$16.50, market cap ~$6.7B, revenue + grant income (ttm) ~$117M, 2025 revenue ~$94M.

AOS and XE are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined AOS and XE exposure against your real portfolio. It is not an investment adviser.