Western Digital (Nasdaq: WDC) is no longer a flash-memory company. It completed the separation of its Flash business on February 21, 2025; Western Digital continued as an HDD-focused company, while Sandisk Corporation (Nasdaq: SNDK) became the independent company operating the Flash business. Western Digital’s FY2026 filing says it held no Sandisk shares as of July 3, 2026. For direct NAND exposure, Sandisk is the closest listed comparison established here; Micron is a broader memory company, and Kioxia is relevant to the industry and Sandisk’s manufacturing relationships.
Is Western Digital still a flash-memory company?
No. Since the February 21, 2025 separation, WDC represents Western Digital’s HDD business, not the former Flash business. Sandisk operates that Flash business as a separate public company. Western Digital’s FY2026 Form 10-K states that it held no Sandisk shares as of July 3, 2026, so WDC is not a current direct proxy for owning NAND flash.
Western Digital described the rationale in its FY2026 Form 10-K, filed August 14, 2026: “We believe the Separation has better positioned us as a pure-play HDD company that can execute innovative technology and product development, capitalize on unique growth opportunities, extend our leadership position, operate more efficiently, and pursue capital allocation strategies to maximize long-term shareholder value.”
What is the difference between Western Digital and Sandisk stock?
The core difference is the storage technology and the business risks that drive results. WDC’s business is hard disk drives; SNDK’s business is flash memory and NAND-based storage. Their post-separation results cover different businesses, and their fiscal reporting histories differ, so headline company results should not be treated as a like-for-like performance comparison.
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| Company or context | Business exposure | What to examine | Comparison boundary |
|---|---|---|---|
| Western Digital (WDC) | HDD business after the Flash separation | Cloud and AI-related storage demand, drive capacity mix, production lead times, suppliers, customer arrangements, and manufacturing constraints | Not a current flash-memory pure play |
| Sandisk (SNDK) | Former WD Flash business; NAND and storage exposure | End-market mix, NAND pricing and demand, technology transitions, manufacturing ramps, and strategic-partner reliance | Closest direct listed flash comparison established here |
| Micron (MU) | Diversified memory and storage products spanning DRAM, NAND, and NOR | DRAM versus NAND contribution, memory-cycle conditions, oversupply risk, and capital requirements | Not a NAND-only company |
| Kioxia | Flash-memory producer and Sandisk manufacturing-joint-venture partner | Joint-venture economics, shared production, partner concentration, and technology investment | Industry context; a matched stock-valuation comparison is not established here |
Which stocks give investors exposure to NAND flash memory?
Sandisk: the most direct listed comparison here
Sandisk’s FY2026 annual filing lists its common stock as SNDK on Nasdaq and covers the year ended July 3, 2026. Its reported revenue spans datacenter, edge, and consumer markets, so even this direct flash comparison is not a single-end-market bet.
Micron: a diversified memory alternative
Micron’s portfolio includes DRAM, NAND, and NOR, as well as components, modules, SSDs, managed NAND, multi-chip packages, and wafers. Its share price therefore reflects more than NAND conditions; assess the contribution and cycle exposure of its different memory businesses rather than treating MU as a NAND-only stock.
Kioxia: an industry participant, with a comparison limit
Kioxia is useful context because it shares manufacturing joint ventures with Sandisk. The information available here supports analysis of that relationship and the associated operating risks, but does not establish a matched stock-valuation comparison for Kioxia.
What do Sandisk’s FY2026 results show—and what do they not show?
Sandisk reported $20.248 billion in revenue for FY2026, up 175% year over year, with GAAP gross margin of 71.5% and non-GAAP gross margin of 71.6%. These are company-reported figures for the year ended July 3, 2026; they are a period snapshot, not evidence by themselves of through-cycle growth, sustainable margins, or an attractive valuation.
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| Sandisk FY2026 segment | Company-reported revenue | Year-over-year change |
|---|---|---|
| Datacenter | $5.153 billion | Up 437% |
| Edge | $12.160 billion | Up 195% |
| Consumer | $2.935 billion | Up 29% |
For Q4 FY2026, Sandisk reported $8.965 billion in revenue, up 51% sequentially. The company attributed approximately one-third of that increase to higher volumes and two-thirds to higher pricing. Quarterly sequential growth can reflect a sharp change in pricing conditions; it should not be read as a recurring growth rate.
Sandisk’s FY2026 results cannot be directly compared with WDC’s total-company results as if both companies had the same business mix or reporting history. The figures above describe Sandisk’s reported performance, not relative stock value.
How do HDD and NAND businesses respond to different cycles?
Western Digital: capacity, demand, and execution in HDDs
Western Digital reported that cloud-storage demand and AI or hybrid-data workloads benefited its HDD business and accelerated demand for higher-capacity drives. It also cited greater manufacturing complexity and longer production lead times for those drives. When comparing WDC, focus on HDD demand, capacity mix, and the company’s ability to manufacture and deliver more complex products; infrastructure-storage demand does not make WDC a NAND company.
Sandisk: NAND pricing, technology, and partner exposure
Sandisk’s August 2026 Investor Day release framed its strategy around a NAND technology roadmap and customer partnerships. Its identified risks include average selling-price trends, demand volatility, technology transitions, manufacturing ramps, long-term agreements, and reliance on strategic partners including Kioxia. These factors can influence results alongside end-market demand.
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Kioxia’s annual securities report describes joint ventures whose output is shared with Sandisk and discusses the possibility that disagreements or changes to agreements could affect operations. The relationship matters to an investor comparison because companies may compete in product markets while remaining connected through manufacturing arrangements.
Micron: memory-cycle and oversupply risk
Micron’s FY2026 Q3 filing identifies a risk that industry investment could create DRAM or NAND oversupply if supply grows faster than demand, affecting prices and results. This is a company-disclosed risk, not a prediction that oversupply will occur. For MU, consider both the mix between memory businesses and the possibility of a broader memory-price downturn.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should investors compare flash-memory stocks?
Start with business exposure, then compare results and valuation using a common date and consistent definitions. A company’s revenue growth or gross margin alone cannot establish whether its shares are cheap or expensive.
- Define the exposure. Separate HDD, NAND, DRAM, and other businesses. For diversified companies such as Micron, identify how much of the business is tied to each relevant memory segment.
- Align the periods. Use financial statements covering comparable fiscal periods, while accounting for the fact that Sandisk and WDC report different post-separation businesses and have different fiscal histories.
- Normalize the cycle. Compare results across more than one point in the pricing cycle where possible. Peak-cycle margins can distort earnings-based multiples, while a downturn can make current results look unusually weak.
- Use consistent valuation measures. For a same-date comparison, examine enterprise value to sales, enterprise value to normalized operating income, free-cash-flow yield, net cash or debt, and capital-expenditure intensity. These are comparison metrics, not figures established here.
- Include execution and dependency risks. Consider manufacturing capacity and lead times, technology transitions, customer arrangements, supplier concentration, and strategic manufacturing partners alongside demand and pricing.
No common-date share prices, valuation multiples, standardized peer metrics, market-share figures, stock returns, or price targets are established here. Without those inputs, the operating data above cannot support a defensible claim that one stock is cheaper, more expensive, or the better investment.
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