APH vs BELFA: Which Is the Better Buy in 2026?
Last updated August 2026
Short answer
APH (Amphenol Corporation) and BELFA (Bel Fuse) share investment themes but are different businesses. The right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme.
APH vs BELFA: the tie-breaker metrics
Same yardstick, side by side (as of August 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.
| Metric | APH | BELFA | What it tells you |
|---|---|---|---|
| Forward P/E | 24.92 | 27.86 | Valuation on next year's expected earnings, the same yardstick for both. Lower is cheaper for that growth; higher means the market is paying up. |
| Trailing P/E | 40.17 | 57.21 | Valuation on the last 12 months. A big drop from trailing to forward means the market expects earnings to jump, so more growth is already in the price. |
| Beta | 1.24 | 1.38 | Volatility vs the market. Above 1 swings harder than the index; below 1 is steadier. Higher beta means bigger drawdowns to hold through. |
| Price vs 52-week range | 76% of range | 62% of range | Where today's price sits between the 52-week low and high. Near the high is momentum with less margin of safety; near the low is out of favor or a discount, depending on why. |
| Price / book | 12.76 | 3.34 | How much you pay over book value. Very high can signal an asset-light, high-return business or a rich price. |
Before you buy: how APH and BELFA affect your concentration
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 BELFA 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 BELFA 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.
What does Amphenol Corporation (APH) do?
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.
What does Bel Fuse (BELFA) do?
Bel Fuse Inc. designs and manufactures electronic components and systems across three broad areas: power solutions and protection (front-end power, DC-DC converters, circuit protection), connectivity solutions (connectors, cable assemblies, and interconnect for harsh environments), and magnetic solutions (integrated connector modules, transformers, and inductors). Founded in 1949 and based in Jersey City, the company sells into networking, defense, aerospace, commercial aviation, space, industrial, and rail markets, and in 2026 began realigning from a product-centric to an end-market-centric organization. Its shares trade in two classes, with BELFA being the Class A stock (which carries voting rights but is more thinly traded and pays a slightly lower dividend than the Class B BELFB shares).
APH vs BELFA: how do they differ?
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.
- BELFA drivers: Defense, aerospace, and space demand; AI and data-center infrastructure.
Which fits which kind of investor
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 BELFA, bel Fuse operates in cyclical component markets where orders can swing quickly with customer inventory corrections, so the recent 17% growth rate may not persist.
APH or BELFA: which should you pick?
APH vs BELFA: the full fundamentals
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.
BELFA. Revenue and margins accelerated in early 2026 on defense, aerospace, and data-center demand, and management guided second-quarter sales to roughly $195 million to $215 million. The valuation expanded meaningfully over the same period, with trailing price-to-earnings multiples reported in the mid-30s and higher depending on the measure. Figures are approximate and as of the dates shown, and Class A (BELFA) trades at different volume and dividend levels than Class B (BELFB).
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; BELFA shows revenue (ttm) ~$0.70 billion, q1 2026 net sales ~$178.5 million (up ~17% YoY), q1 2026 gross margin ~39%, q1 2026 diluted eps (class b) ~$0.91 GAAP.
The bottom line: APH vs BELFA
APH and BELFA 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 BELFA exposure against your real portfolio. It is not an investment adviser.
Wondering how APH or BELFA fits the portfolio you already own? Walnut is an AI investing app that connects your brokerage read-only and answers questions like that about your actual holdings: overlap, concentration, and how each position tracks the S&P 500. Compare the best AI portfolio analyzers or see the best AI investing apps in 2026.
Investing in Amphenol Corporation with AI
Connect the broker you already use and ask Walnut's AI how APH fits what you actually hold: whether you own it already through a fund, what it would do to your concentration, and how it has tracked the S&P 500. Read-only by default, and you approve anything before it reaches your broker.
FAQ
What is the difference between APH and BELFA?
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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. Bel Fuse Inc. They show up together because they share investment themes, but they are different businesses, so the better fit depends on which thesis you are expressing.
Is APH or BELFA the better stock?
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Neither is universally better; they suit different views and risk levels. Walnut is informational, not investment advice. Compare what each does, the tie-breaker metrics above, and the risks, then decide which fits your thesis and what you already own.
Which is cheaper, APH or BELFA?
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On forward P/E (as of August 2026), APH trades at 24.92x and BELFA at 27.86x, so APH is the cheaper of the two on next year's expected earnings. A lower multiple is not automatically the better buy: a richer valuation can be justified by faster growth, and a lower one can reflect real risk. Weigh the multiple against how fast each business is compounding.
Should you own both APH and BELFA?
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Because they share themes, owning both concentrates you in that theme. That can be intentional (a focused bet) or accidental (less diversification than it looks). Walnut can show your combined exposure across both, and whether adding either over-concentrates you, before you buy.
What are the risks of APH vs BELFA?
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APH: The most cited risk is valuation, with the stock trading at a premium price to earnings multiple that assumes continued strong growth. A slowdown in AI-related data center capital spending would directly pressure the segment now driving results. Integration risk from large acquisitions like CommScope CCS, including goodwill and added debt, is another concern. Cyclical exposure to automotive, industrial, and mobile markets can create quarter to quarter volatility, and being a global manufacturer leaves it exposed to tariffs, supply chain disruption, and currency swings. Competition from large rivals could pressure pricing and share over time. BELFA: Bel Fuse operates in cyclical component markets where orders can swing quickly with customer inventory corrections, so the recent 17% growth rate may not persist. The stock has re-rated to a valuation that prices in continued strength, leaving limited margin for a demand air-pocket. Larger, broader-portfolio competitors such as Amphenol and TE Connectivity have scale and pricing advantages that can pressure Bel's margins and lead times. The 2026 Class B equity offering dilutes existing holders even as it strengthens the balance sheet, and acquisition integration (Enercon) adds execution risk. Finally, BELFA is the thinner-traded share class, so liquidity and the class-based dividend and voting differences versus BELFB are their own consideration.
Walnut is informational, not investment advice. This page is descriptive and not a recommendation to buy or sell APH or BELFA; figures are approximate and dated (as of August 2026). Verify current data before investing.