Arm vs. Sandisk: Which Tech Stock Is a Better Buy in October?

Choosing between high-margin design licensing and high-volume hardware manufacturing is a classic dilemma for investors. Your choice between Arm (NASDAQ:ARM) and Sandisk (NASDAQ:SNDK) depends on your preference for valuation versus growth.

Arm focuses on the architectural blueprints of modern computing, while Sandisk manufactures the actual memory components required to store and process data. Both companies are positioned to benefit from the growing adoption of AI, but their financial structures and market roles are vastly different.

The case for Arm

As a leading developer of processor designs, the company is a central figure among semiconductor stocks by licensing its blueprints to global hardware manufacturers. Arm does not produce chips itself but instead collects royalties and licensing fees from companies that use its architecture in smartphones, laptops, and data centers. This business model enables a high degree of scalability because the company avoids the massive capital costs of operating its own factories.

In fiscal 2026 (ending in March), revenue reached $4.9 billion -- a 23% year-over-year increase over the previous year. This expansion helped the company achieve a net income of $698 million. While the business continues to grow its top line, the net margin (the percentage of revenue retained as profit) is about 14%, reflecting stable profitability for a design-focused firm.

As of its June 2026 balance sheet, the current ratio (a measure of a company's ability to cover its short-term debts with short-term assets) stands at approximately 5.3x. The debt-to-equity ratio is 0.1x, indicating that the company's debt is low relative to its equity.

On a trailing 12-month basis, free cash flow was $705 million. However, stock-based compensation accounted for roughly 69% of operating cash flow, inflating reported cash generation because SBC is a non-cash expense added back to cash flow.

The case for Sandisk

Sandisk specializes in NAND flash memory products used in everything from consumer mobile devices to enterprise-grade cloud infrastructure. The company serves a wide array of original equipment manufacturers and cloud service providers. In its latest annual report, it noted that no single customer accounted for more than 10% of revenue. This diversification helps mitigate the risk of losing a primary buyer, although the business remains sensitive to the broader demand for storage hardware.

In fiscal 2026 (ending in July), revenue reached $20 billion, representing a massive 175% increase over the prior year. Net income was $11.4 billion for the period, marking a significant turnaround from previous years. This resulted in a net margin of nearly 56%, highlighting how effectively the business capitalized on rising demand and pricing for memory storage solutions.

Based on its July 2026 balance sheet, Sandisk maintains a current ratio of approximately 2.3x, and the company maintains a solid financial position with zero debt.

Free cash flow for the period reached nearly $11.5 billion, providing the business with significant capital to reinvest in its technology or return to its owners through other means.

Risk profile comparison

Arm faces competition from other chip architectures, including open-source alternatives that could challenge its licensing dominance. Furthermore, its heavy concentration in the smartphone market makes it vulnerable to any slowdown in consumer electronics spending. Because the company relies on a royalty-based model, any shift in how its partners design their hardware could directly impact its long-term revenue streams.

Sandisk relies heavily on its joint ventures with Kioxia for its supply of flash memory, creating a strategic dependency that financial or operational issues could disrupt at its partner. The storage market is also notoriously cyclical and faces intense competition from Samsung Electronics, Micron Technology, and SK Hynix.

Valuation comparison

Sandisk appears significantly cheaper than Arm on both an earnings and sales basis, reflecting the market's high growth expectations for the chip designer.

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

The Forward P/E compares the current stock price to future earnings estimates for the next year. The P/S ratio measures the market value of the company compared to its sales over the past twelve months.

Which stock would I buy in 2026?

I would buy Sandisk. While it operates in a more competitive and volatile industry, where memory prices have historically fluctuated wildly based on demand/supply dynamics, it is benefiting from substantial demand for flash memory that exceeds what the industry can supply -- and this situation could last for another few years.

Arm offers more consistent, high-margin growth from its licensing business model. However, the stock's high forward P/E prices in a lot of growth, leaving relatively lower upside compared to Sandisk.

The market is still pricing Sandisk like a cyclical memory supplier, despite the industry shifting to long-term customer agreements. Sandisk has signed eight of these so far, which put a floor under selling prices. These deals don't completely remove the risk of lower revenue and earnings if memory pricing drops, but it means Sandisk can still earn a healthy profit margin in the next downturn. Management said on the recent earnings call that these strategic agreements will make up two-thirds of bits shipped by fiscal 2028.

It's a high-risk, high-reward proposition, but it's one I would be willing to make, especially compared to paying over 100x earnings for Arm.

John Ballard has no position in any of the stocks mentioned. The Motley Fool has positions in and recommends Arm Holdings, Micron Technology, and Western Digital. The Motley Fool has a disclosure policy.