APH vs ST: Which Is the Better Buy in 2026?

Same yardstick, side by side (as of October 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. The company employs about 170,000 people.

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 about 40 times trailing earnings and 24 times forward, a premium 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. Amphenol reported record Q2 2026 revenue of about $8.8 billion and adjusted EPS of $0.68 against a $0.60 consensus, lifting trailing revenue to about $29 billion. At roughly 40x trailing and 24x forward earnings the stock prices in a continuation of AI-driven growth plus the CommScope contribution. Q3 results are due October 28, 2026, with consensus near $9.5 billion of revenue and $0.73 of EPS.

ST. Figures are approximate and tied to the asOf date; verify live numbers before acting. The trailing P/E near 68x still divides the price by earnings depressed by a roughly $163 million GAAP loss in Q3 2025, so the forward P/E around 10x, down from about 12x in July as the share price fell, is the more useful gauge. EV/EBITDA is about 10.4x. For a cyclical auto supplier, the valuation ultimately hinges on where vehicle production and margins sit in the cycle; the October 27 report and the mean analyst target of about $53 are the next reference points.

Headline figures (approximate, October 2026): APH shows revenue (ttm) ~$29 billion, revenue growth (q2 2026, yoy) ~55%, net income (ttm) ~$5.1 billion, operating margin (ttm) ~30%; ST shows revenue (ttm) ~$3.78 billion (Q2 2026 was ~$990.6 million, up ~5% year over year), adjusted eps (q2 2026) ~$0.98 (vs ~$0.93 est.), net income (ttm) ~$90 million (Q2 2026 ~$102 million), operating margin ~16.4%.

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.