IFNNY vs ON: Which Is the Better Buy in 2026?

Last updated October 2026

Short answer

IFNNY is the larger of the two ($85.70B market cap): the incumbent the market prices for continued execution (19.23x forward earnings, beta 1.91). ON is the smaller challenger ($32.79B), priced similarly on forward earnings (18.60x): more room to run, but more to prove. The real question is which set of drivers you believe, and whether owning one (or both) leaves you over-concentrated.

IFNNY vs ON: the tie-breaker metrics

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.

Metric	IFNNY	ON	What it tells you
Market cap	$85.70B	$32.79B	Size. The larger name is the incumbent; the smaller has more room to grow and more to prove.
Forward P/E	19.23	18.60	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	61.64	55.05	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	1.91	2.00	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	44% of range	44% 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	4.38	4.54	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 IFNNY and ON 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. IFNNY and ON 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 IFNNY and ON 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 Infineon Technologies AG (IFNNY) do?

Infineon Technologies AG designs and manufactures semiconductors used wherever electricity has to be converted, switched or controlled: electric drivetrains, chargers, solar inverters, wind turbines, trains, industrial motors, server power supplies and phone chargers, plus microcontrollers, sensors and security chips. In fiscal 2025 (the year to September 30, 2025) revenue was €14.66 billion, down 2%, with a Segment Result margin of 17.5%. Automotive (ATV) brought in €7.40 billion, or about half of sales, at a €1.53 billion Segment Result. Power & Sensor Systems (PSS), home of the AI server power business, grew 11% to €4.21 billion. Green Industrial Power (GIP) fell 16% to €1.63 billion and Connected Secure Systems (CSS) fell 6% to €1.42 billion. Greater China was the largest region at 38% of revenue, followed by Europe, the Middle East and Africa at 24%, the rest of Asia-Pacific at 17%, the Americas at 12% and Japan at 9%.

Full IFNNY guide

What does onsemi (ON) do?

onsemi (ON Semiconductor) is a US-based semiconductor company focused on intelligent power and sensing technologies. Its power products, including silicon and silicon-carbide devices, manage and convert electricity in electric vehicles, industrial equipment, and power supplies, while its sensing products, such as image sensors, are used in automotive cameras and industrial vision. The company has deliberately concentrated on automotive and industrial markets, where semiconductor content per vehicle and per machine is rising, and it has been repositioning its manufacturing and product mix toward higher-margin, differentiated products rather than commodity chips.

Full ON guide

IFNNY vs ON: 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.

IFNNY drivers: Power supplies for AI data centers; Margin recovery from better factory loading.
ON drivers: AI data-center power opportunity; Rising semiconductor content in vehicles.

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: Infineon's earnings are cyclical, and fiscal 2025 showed how quickly they can fall: revenue dropped 2% and Segment Result fell from €3.1 billion to €2.6 billion as customers cut inventories and factories ran below capacity. For ON, the dominant risk is cyclicality: onsemi's automotive and industrial end markets rise and fall with the economy, vehicle production, and factory investment, so revenue and earnings can swing sharply and a soft patch can pressure results even amid long-run content growth.

IFNNY or ON: which should you pick?

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 IFNNY if you believe its drivers more; ON 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 IFNNY and ON guides.

IFNNY vs ON: the full fundamentals

IFNNY. Trailing revenue of about €15.6 billion combines the September 2025 quarter (€3.94 billion) with the first three quarters of fiscal 2026 (€3.66 billion, €3.81 billion and €4.17 billion), so it understates the run rate if the guided €4.7 billion September quarter arrives. Adjusted diluted EPS was €0.44 in the June quarter, up from €0.34 in March, against a share price near €59, which means the valuation depends heavily on margins continuing toward the guided 23%. Adjusted free cash flow guidance is about €1.85 billion for fiscal 2026, while reported free cash flow of about €0.9 billion is lower because it includes the ams OSRAM purchase and frontend building investment. Full-year results are due on November 10, 2026.

ON. Figures are approximate and tied to the asOf date; verify live numbers before acting. For a cyclical semiconductor company, earnings multiples can look high near a cyclical trough (when profits are depressed) and low near a peak, so it helps to consider where automotive and industrial demand sit in the cycle rather than a single P/E. The AI data-center growth adds a faster-moving element to what has been a more cyclical, content-driven story.

Headline figures (approximate, October 2026): IFNNY shows revenue (ttm to june 2026) ~€15.6B, fy2026 revenue guidance ~€16.3B (~11% growth), q3 fy2026 segment result margin 19.1% (Q4 guided ~23%), market cap ~€77B (~$86B; IFNNY ~$66); ON shows revenue (q1 2026) ~$1.51 billion, above the midpoint of guidance, gaap gross margin ~38.5% in Q1 2026, non-gaap diluted eps ~$0.64 in Q1 2026, ai data-center growth up more than 30% sequentially; expected to roughly double year over year in 2026.

The bottom line: IFNNY vs ON

IFNNY and ON 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 IFNNY and ON exposure against your real portfolio. It is not an investment adviser.

Wondering how IFNNY or ON 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 Infineon Technologies AG with AI

Connect the broker you already use and ask Walnut's AI how IFNNY 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.

Does IFNNY fit me?

FAQ

What is the difference between IFNNY and ON?

Is IFNNY or ON the better stock?

Neither is universally better. IFNNY is the larger incumbent; ON is the smaller challenger and looks cheaper on forward earnings. 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, IFNNY or ON?

On forward P/E (as of October 2026), IFNNY trades at 19.23x and ON at 18.60x, so ON 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 IFNNY and ON?

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 IFNNY vs ON?

IFNNY: Infineon's earnings are cyclical, and fiscal 2025 showed how quickly they can fall: revenue dropped 2% and Segment Result fell from €3.1 billion to €2.6 billion as customers cut inventories and factories ran below capacity. Automotive is about half of sales, and management says high-voltage electric vehicle demand remains subdued, so a weak car market can offset gains elsewhere. The AI data center story is concentrated in a small number of hyperscale and server customers, and capacity reservation agreements may not translate fully into revenue if AI capital spending slows or customers switch suppliers. Greater China provided 38% of fiscal 2025 revenue, which exposes the company to Chinese competition in power semiconductors, export controls and tariff disputes. Currency is a recurring headwind: Infineon reports in euros but sells heavily in dollars, and its guidance assumes US$1.15 per euro. The balance sheet carried about €6.8 billion of financial debt and €5.2 billion of net debt at the end of June 2026, after the Marvell and ams OSRAM purchases. The share price has been volatile, falling from near €89 in spring 2026 to around €59 in early October, and it fell on the day of the June-quarter report despite record revenue. For US holders, IFNNY trades over the counter with lower volume than the Frankfurt line (about 345,000 ADS a day on average in fiscal 2025), and its dollar price moves with the euro as well as the shares. ON: The dominant risk is cyclicality: onsemi's automotive and industrial end markets rise and fall with the economy, vehicle production, and factory investment, so revenue and earnings can swing sharply and a soft patch can pressure results even amid long-run content growth. Competition is intense from larger and specialized power- and analog-chip makers, which can pressure pricing and share. The silicon-carbide and AI data-center opportunities require heavy investment and execution, and demand there could disappoint or arrive more slowly than hoped. Semiconductor manufacturing is capital-intensive, so factory utilization and inventory swings can move margins quickly. Concentration in automotive means an EV or auto-production slowdown would hit onsemi harder than a more diversified chipmaker. Trade policy, tariffs, and the health of key customers add further variables outside the company's control.

Walnut is informational, not investment advice. This page is descriptive and not a recommendation to buy or sell IFNNY or ON; figures are approximate and dated (as of October 2026). Verify current data before investing.