APH vs ST: 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.

Reading it: ST 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. APH and ST 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 APH and ST 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.

Amphenol Corporation designs and manufactures electronic and fiber optic connectors, cable, and interconnect systems used across communications, information technology, automotive, industrial, aerospace, defense, mobile devices, and broadband markets. The business is organized into segments spanning harsh environment solutions, communications solutions, and interconnect and sensor systems, and it grows through a combination of organic design wins and a long, disciplined acquisition history. Its January 2026 completion of the roughly ~$10.5 billion purchase of CommScope's Connectivity and Cable Solutions business meaningfully expanded its fiber optic and IT datacom capabilities.

Full APH guide

Sensata Technologies Holding plc is a global industrial technology company that designs and makes sensors, high-voltage protection, and electrical components used mainly in automotive, heavy-vehicle and off-road, industrial, and aerospace applications. It reports in two segments: Performance Sensing, which supplies sensors and high-voltage solutions for cars and heavy vehicles (things like tire-pressure monitoring, thermal management, electrical protection, and powertrain sensing) and made up roughly 70% of sales in fiscal 2024, and Sensing Solutions, which sells application-specific pressure, temperature, and position sensors plus motor protectors, high-voltage contactors, relays, and battery-management products into industrial and other markets. Because most of its revenue is tied to vehicle production, Sensata's results track global light-vehicle build rates and its ability to win content on new platforms far more than any one product line.

Full ST guide

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

• APH drivers: AI data center demand; Acquisition-led expansion.
• ST drivers: Margin recovery and cost execution; Electrification content per vehicle.

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: The most cited risk is valuation, with the stock trading at a premium price to earnings multiple that assumes continued strong growth. For ST, the dominant risk is automotive cyclicality: with most revenue tied to vehicle production, a slowdown in global light-vehicle builds can pressure volumes, and prolonged softness tends to show up later as program churn and factory under-absorption.

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 APH if you believe its drivers more; ST 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 APH and ST guides.

APH. As of July 2026 Amphenol had posted record Q1 2026 revenue of roughly ~$7.6 billion, with trailing twelve month revenue near ~$23 billion and EPS around ~$3.66. The premium P/E near ~44x reflects investor expectations for continued AI-driven growth and the added contribution from the CommScope CCS acquisition. These figures are approximate and reference the July 2026 reporting picture.

ST. Figures are approximate and tied to the asOf date; verify live numbers before acting. The trailing P/E near triple digits is misleading because it divides the price by earnings that were depressed by large 2024 and 2025 goodwill and restructuring charges, so the forward P/E around 12x is the more useful gauge. For a cyclical auto supplier, the valuation ultimately hinges on where vehicle production and margins sit in the cycle rather than on a single multiple.

Headline figures (approximate, July 2026): APH shows revenue (ttm) ~$23 billion, net income (ttm) ~$4.3 billion, diluted eps (ttm) ~$3.66, q1 2026 revenue ~$7.6 billion; ST shows revenue (ttm) ~$3.7 billion (Q1 2026 was ~$934.8 million, up ~2.6% year over year), adjusted eps (q1 2026) ~$0.86 (GAAP EPS ~$0.59), net income (q1 2026) ~$87 million attributable to common shareholders, market cap ~$7 billion (mid-cap).

APH and ST 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 APH and ST exposure against your real portfolio. It is not an investment adviser.