Full Breakdown
SanDisk and Western Digital Shares Plunge After Strong Earnings Miss Investor Expectations
8/7/2026, 7:29:25 AM
Core Event
- On August 5, SanDisk released its fourth-quarter fiscal results, reporting revenue of $8.97 billion and adjusted earnings per share of $39.25—both beating analysts’ expectations. Western Digital posted comparable earnings and guided first-quarter revenue to $4.1 billion ± $100 million.
- Despite the beats, both companies’ shares fell on August 6: SanDisk dropped 13.3 % (about 9.2 % pre-market) and Western Digital fell 19.1 % (about 14.6 % pre-market). The Western Digital decline was its steepest one-day drop since April 2025.
Background & Context
- Memory-storage stocks have surged in 2026 on expectations that AI data-center construction will drive demand for high-performance NAND and SSDs. SanDisk’s stock has risen more than fivefold this year, while Western Digital has more than tripled, outpacing the Philadelphia Semiconductor Index’s ~70 % gain and the S&P 500’s 12.8 % rise.
- A global shortage of high-end memory chips has lifted component prices, boosting manufacturers’ revenues.
Data & Statistics
- SanDisk Q4 revenue: $8.97 billion, +372 % YoY.
- Adjusted EPS: $39.25.
- SanDisk Q1 guidance: $10.3 billion – $10.8 billion (Reuters, Heygotrade).
- Western Digital Q1 guidance: $4.1 billion ± $100 million (Reuters, Heygotrade).
- Stock moves on August 6 (premarket): SanDisk –9.2 %, –13.3 %; Western Digital –14.6 %, –19.1 %.
- Data-center revenue at SanDisk: grew >400 % in 2026 versus 2025.
Official Statements & Responses
- Kinngai Chan, Summit Insights analyst, warned that Western Digital’s transition to heat-assisted magnetic recording (HAMR) “creates risk,” expecting average exabyte prices to decline as HAMR drives ship in 2027.
- David Goeckeler, CEO of SanDisk, highlighted multi-year customer agreements totaling roughly $93.9 billion to lock in capacity.
Conflicting Reports & Gaps
- Reuters reported SanDisk’s share decline as 13.3 % on August 6, whereas Heygotrade cited a pre-market drop of about 9.2 %. Both describe the same trading day but differ in timing and magnitude.
- Detailed earnings numbers for Western Digital were not disclosed in the provided sources, leaving a gap in direct performance comparison.
Timeline
- August 5 – SanDisk releases fourth-quarter fiscal results.
- August 6 – Market reacts: SanDisk shares tumble 13.3 % and ~9.2 % pre-market; Western Digital falls 19.1 % and ~14.6 % pre-market.
Why It Matters
- The sell-off shows that elevated expectations for AI-driven data-center demand can outweigh solid earnings, prompting profit-taking and scrutiny of growth pathways such as HAMR technology.
- Strong demand from cloud providers—e.g., Amazon’s 2026 capital-expenditure increase to $220 billion citing memory costs—suggests the sector’s fundamentals remain robust, but investors now seek clearer signals of sustained pricing power and margin expansion.
Verbatim Quotes
- “The recent volatility in semiconductor stocks appears disconnected from any material change in long-term fundamentals,” — Divya Mathur, ClearBridge Investments.
