ASML vs. Nvidia: Which AI Semiconductor Stock Is a Better Buy in 2026?

As the artificial intelligence (AI) boom matures, investors can choose between companies that design AI chips and those that supply the specialized machinery required to manufacture them. Is ASML Holding (NASDAQ:ASML) or Nvidia (NASDAQ:NVDA) the better play?

ASML is the world's only manufacturer of extreme ultraviolet (EUV) lithography systems, the machines used to produce leading-edge chips. Nvidia operates at the other end of the supply chain, designing graphics processing units (GPUs) that train and run AI models in data centers. Both offer a way to invest in AI stocks, though they are growing at very different rates.

The case for ASML

ASML designs and manufactures the lithography systems that chipmakers use to print circuit patterns onto silicon wafers. It stands apart among semiconductor stocks because its EUV systems print the highly complex layers of advanced chips found in newer smartphones and AI hardware. The company sells to makers of both logic and memory chips, and its customer base is concentrated. Four customers accounted for about 61% of total net sales in 2025, according to its annual report.

ASML reports its results in euros, and the figures here are converted to U.S. dollars. In the fiscal year ended Dec. 31, 2025, revenue reached about $37.1 billion, up roughly 15.6% from the prior fiscal year. Net income totaled about $10.9 billion for the period, with a net margin of about 29.4%.

On its December 2025 balance sheet, prepared under U.S. GAAP, the debt-to-equity ratio was roughly 0.2x. That means total debt, including both short-term and long-term borrowings, was about a fifth of shareholder equity.

The current ratio, which measures the ability to pay short-term obligations with short-term assets, was roughly 1.3x, and free cash flow reached close to $12.1 billion.

The case for Nvidia

Nvidia designs GPUs and the software that runs on them, which together are used to train and deploy AI models. In its annual report for fiscal 2026, which ended on Jan. 25, 2026, the company noted that two customers accounted for approximately 22% and 14% of total revenue, respectively. This level of customer concentration adds risk, as losing one major buyer could hurt financial results.

In fiscal 2026, revenue reached close to $215.9 billion, up roughly 65.5% year over year. Net income followed suit, climbing to about $120.1 billion during the same period. That resulted in a net margin of about 55.6%, although net income included roughly $8.9 billion in net gains on equity securities.

On its January 2026 balance sheet, the debt-to-equity ratio was about 0.05x on a total-debt basis, indicating limited reliance on borrowed capital relative to equity. Nvidia has borrowed more since then, and its July 26, 2026, balance sheet shows about $33.4 billion of debt, or roughly 0.15x equity.

The current ratio at the end of fiscal 2026 was approximately 3.9x, indicating ample liquidity to cover near-term obligations. Free cash flow for fiscal 2026 was approximately $96.7 billion, representing the cash generated from operations minus capital expenditures.

Risk profile comparison

ASML depends on a narrow supply chain. It relies on external vendors for components in its systems, and each component is obtained from a single supplier or a limited number of suppliers, according to its annual report.

Export controls also limit which systems the company can ship to customers in China, which accounted for about 29% of total net sales in 2025. In addition, ASML is bringing its next-generation High NA EUV systems to market, and research and development costs ran about 14% of total net sales in 2025.

Nvidia does not manufacture its own chips. It relies on foundries such as Taiwan Semiconductor Manufacturing (NYSE:TSM) to produce its wafers, and its annual report cites long manufacturing lead times and dependence on third-party suppliers as risks. Export controls have also been costly.

A U.S. license requirement on its H20 chips led to a $4.5 billion charge in the first quarter of fiscal 2026, and Nvidia said it was effectively foreclosed from China's data center compute market as of the end of that fiscal year.

Additionally, the company competes with large cloud companies such as Alphabet (NASDAQ:GOOGL) (NASDAQ:GOOG) and Amazon (NASDAQ:AMZN) that design their own AI hardware.

Valuation comparison

Nvidia trades at a lower forward price-to-earnings (P/E) multiple even though its price-to-sales (P/S) ratio is higher.

Metric	ASML	Nvidia
Forward P/E	28.9x	24.4x
P/S ratio	16.4x	18.0x

Valuation metrics include sourcing from Financial Modeling Prep (FMP) and may differ from other data providers.

The forward P/E compares the stock price to future earnings estimates, while the P/S ratio measures the stock price against sales over the past 12 months.

Which stock would I buy in 2026?

Nvidia looks like the better buy to me in 2026, with a caveat that applies to both stocks. Each depends on the same wave of AI data center spending, so I'd own either only as part of a diversified portfolio held for five years or more.

Nvidia is growing faster and trades at a lower multiple of expected earnings. Revenue more than doubled year over year in its fiscal 2027 second quarter, which ended July 26, 2026.

Management then guided for about $108 billion in the fiscal third quarter without assuming any data center compute revenue from China. On Sept. 28, the company added $150 billion to its share repurchase authorization, which says a good deal about the cash this business generates.

The risk is concentration. Two customers accounted for more than a third of fiscal 2026 revenue, and large cloud companies are designing their own AI chips.

ASML deserves more than a passing mention. In July, management raised its 2026 sales outlook to a range roughly a third above its 2025 total, and it plans to add EUV capacity for 2027. Its machines are used to make leading-edge chips, regardless of who designs them, giving ASML a stake in AI's growth even if Nvidia's rivals gain ground.

The shares have gained more than 80% over the past year, though, and the higher earnings multiple appears to reflect much of that strength. For investors who already own Nvidia, ASML still looks like a worthy long-term holding.

Mike Schwenk has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends ASML, Alphabet, Amazon, Nvidia, and Taiwan Semiconductor Manufacturing. The Motley Fool has a disclosure policy.