CAT vs UNH: How Caterpillar and UnitedHealth Group Compare (2026)

Same yardstick, side by side (as of July 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.

Reading it: UNH is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.

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. CAT and UNH 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 CAT and UNH 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.

Caterpillar is the world's largest manufacturer of construction and mining equipment, and a major maker of diesel and natural gas engines, industrial gas turbines, and locomotives. It sells bulldozers, excavators, loaders, dump trucks, and related heavy machinery used in construction, mining, quarrying, and infrastructure, plus power systems and engines for oil and gas, marine, power generation, and data-center backup. Caterpillar makes money by selling new equipment through a global dealer network and, increasingly importantly, by selling high-margin aftermarket parts, services, and financing through Cat Financial. Its three core segments are Construction Industries, Resource Industries (mining), and Energy and Transportation. The company is highly cyclical, tied to global construction activity, commodity prices, and infrastructure spending, but its large installed base generates recurring service revenue that smooths the cycle. Caterpillar is headquartered in Irving, Texas, and sells worldwide.

Full CAT guide

UnitedHealth Group is the largest US health insurer and one of the largest healthcare companies in the world. It runs through two main engines. UnitedHealthcare is the insurance arm, providing employer, individual, Medicare Advantage, and Medicaid health plans to tens of millions of members. Optum is the faster-growing health-services arm: Optum Health (physician groups and care delivery, including value-based care), Optum Insight (healthcare data, analytics, and technology), and Optum Rx (one of the largest pharmacy benefit managers in the country). The combination lets UnitedHealth manage both the financing and the delivery of care, capturing margin across the system and using vast claims data to manage costs. Headquartered in Minnetonka, Minnesota, UnitedHealth is a Dow component and one of the largest companies in the S&P 500 by revenue. Its scale, vertical integration, and Medicare Advantage leadership define its competitive position.

Full UNH guide

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

• CAT drivers: Infrastructure and construction demand; Energy and data-center power.
• UNH drivers: Optum growth engine; Medicare Advantage scale.

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: Caterpillar is deeply cyclical. For UNH, unitedHealth faces a difficult medical-cost environment: rising utilization (especially in Medicare Advantage) can spike the medical loss ratio and compress margins, as the company has experienced.

Pick CAT if you believe its drivers more; UNH 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 CAT and UNH guides.

CAT. Caterpillar trades as a high-quality cyclical: investors pay a moderate earnings multiple that reflects best-in-class margins, a wide dealer moat, and growing services revenue, balanced against the inherent volatility of construction and mining demand. The valuation tends to expand on infrastructure and data-center power optimism and contract when global growth signals soften.

UNH. UnitedHealth's revenue is enormous but its insurance margins are thin by design, so earnings hinge on the medical loss ratio and Optum's higher-margin growth. The valuation reflects scale and integration but has been pressured by cost inflation, regulatory uncertainty, and reputational headwinds. The market weighs Optum's durable growth against insurance-cycle and political risk.

Headline figures (approximate, early 2026): CAT shows revenue (ttm) ~$65 billion, operating margin ~20%, net income (ttm) ~$10 billion, dividend yield ~1.5%, with a long growth record (Dividend Aristocrat); UNH shows revenue (ttm) ~$400 billion, operating margin ~6-8%, net income (ttm) ~$15-22 billion (sensitive to medical costs), medical loss ratio ~85-89%.

CAT and UNH 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 CAT and UNH exposure against your real portfolio. It is not an investment adviser.