APH vs LFUS: 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: LFUS 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 LFUS 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 LFUS 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

Littelfuse (NASDAQ: LFUS), founded in 1927, designs and manufactures electronic components, modules and subassemblies focused on circuit protection, power control and sensing. It reports in three segments: Electronics (its largest, spanning fuses, semiconductors, ESD suppressors and varistors for data centers, industrial drives, aerospace and telecom), Transportation (fuses and sensors for passenger, commercial and off-road vehicles) and Industrial (protection and power products for grid storage, renewables, HVAC and industrial safety). The company is widely cited as the global leader in electronic fuses with a large share of that market.

Full LFUS 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.
• LFUS drivers: Electrification and power semiconductors; Data center and renewables demand.

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 LFUS, littelfuse is cyclical and sensitive to industrial production, auto builds and semiconductor inventory cycles, so a downturn in any of those can pressure revenue and margins.

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; LFUS 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 LFUS 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.

LFUS. Q1 2026 revenue of about $657 million beat expectations and grew roughly 19 percent, with adjusted EPS near $3.31 well above the consensus estimate. The forward P/E in the high-20s sits above Littelfuse's five-year median near 24x, and one third-party model estimated the shares were trading well above fair value in mid-2026. Figures are approximate and drawn from recent filings and market data.

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; LFUS shows revenue (2025) ~$2.4B, q1 2026 revenue ~$657M (up ~19% YoY), q1 2026 adjusted eps ~$3.31, adjusted ebitda margin ~22.9%.

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