APH vs BELFB: Which Is the Better Buy in 2026?
Last updated August 2026
Short answer
APH (Amphenol Corporation) and BELFB (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 BELFB: 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 | BELFB | What it tells you |
|---|---|---|---|
| Forward P/E | 24.92 | 25.11 | 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 | 69.92 | 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 | 70% 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 | 7.88 | 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 BELFB 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 BELFB 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 BELFB 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 (BELFB) do?
Bel Fuse designs and manufactures a broad range of electronic components used inside other companies' equipment. Its products span three product groups: Power Solutions and Protection (front-end, board-mount and industrial power supplies plus circuit-protection fuses), Connectivity Solutions (fiber-optic, copper, RF and RJ connectors and cable assemblies), and Magnetic Solutions (integrated connector modules, transformers and inductors). These parts go into networking, telecom, computing, industrial, defense, commercial aerospace, transportation and eMobility systems, which makes Bel a supplier to the broader electronics and infrastructure build-out rather than a consumer-facing brand.
APH vs BELFB: 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.
- BELFB drivers: Mix shift to aerospace and defense; Data-center and AI-infrastructure demand.
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 BELFB, bel Fuse's demand is cyclical and project-driven, so orders can fall quickly when networking, industrial or computing customers cut spending or work down inventory.
APH or BELFB: which should you pick?
APH vs BELFB: 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.
BELFB. Bel reported record full-year 2025 sales of about $675.5 million, up roughly 26%, with GAAP net earnings of about $61.5 million and EPS near $4.87, and gross margin expanding to about 39%. Fourth-quarter GAAP results included a $13.1 million non-cash impairment tied to its Innolectric equity investment, while non-GAAP quarterly earnings still rose year over year. After a large share-price run (a 52-week range from roughly $92 to over $314), the trailing P/E has re-rated well above its historical norm, and the dividend is small relative to the share price.
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; BELFB shows revenue (fy2025) ~$675.5 million, net earnings (fy2025, gaap) ~$61.5 million, eps (fy2025) ~$4.87, adjusted ebitda (fy2025) ~$142.9 million.
The bottom line: APH vs BELFB
APH and BELFB 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 BELFB exposure against your real portfolio. It is not an investment adviser.
Wondering how APH or BELFB 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 BELFB?
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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 designs and manufactures a broad range of electronic components used inside other companies' equipment. 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 BELFB 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 BELFB?
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On forward P/E (as of August 2026), APH trades at 24.92x and BELFB at 25.11x, 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 BELFB?
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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 BELFB?
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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. BELFB: Bel Fuse's demand is cyclical and project-driven, so orders can fall quickly when networking, industrial or computing customers cut spending or work down inventory. The company competes against much larger and well-capitalized rivals in power and connectivity, which can pressure pricing and share. Acquisitions add integration risk and have led to non-cash impairment charges, including the fourth-quarter 2025 write-down tied to Innolectric. The stock has re-rated sharply after a large run, so a rich valuation leaves less room for error if growth or margins disappoint. Its dual-class structure concentrates voting control, and exposure to global supply chains, tariffs and input costs adds further uncertainty.
Walnut is informational, not investment advice. This page is descriptive and not a recommendation to buy or sell APH or BELFB; figures are approximate and dated (as of August 2026). Verify current data before investing.