Why Sandisk Stock Keeps Going Down

Sandisk shares fell 14.5% Thursday morning after losing 36% over the prior six trading days, despite remaining up 400% over 52 weeks. The article notes that China’s CXMT makes DRAM while Sandisk focuses on NAND, so the firms are not direct competitors; potential competition could emerge in high-bandwidth flash versus HBM. CXMT reportedly received $1 billion in DRAM customer prepayments through September, while its HBM3E yields are reportedly only 20%–30%.

Analysis

The key market mechanism is category confusion: CXMT’s DRAM funding and HBM ambitions do not directly add NAND supply, so treating its announcement as an immediate SNDK earnings threat would be premature. The more relevant channel is valuation and risk appetite: any credible Chinese progress in advanced memory can pressure the broader memory complex, while SNDK’s recent run-up makes it vulnerable to de-risking even without a near-term fundamentals change.

Over the next 1–3 months, the test is whether NAND pricing, customer orders and Sandisk’s guidance support the AI-storage growth embedded in expectations—not whether CXMT can announce funding. Over 6–18 months, competition becomes material if CXMT demonstrates repeatable HBM yields and customers qualify its products, or if Sandisk’s high-bandwidth flash gains traction as a substitute. Both are execution-dependent; neither follows from a financing announcement alone. DRAM leaders such as Micron and SK hynix may face more direct HBM competition than SNDK, while NAND peers could feel spillover if Chinese investment expands beyond DRAM.

Contrarian view: the selloff may be over-attributing a DRAM development to NAND, but the stock’s prior appreciation also raises the bar for evidence of durable AI-related economics. Avoid calling a bottom without NAND pricing, qualification and guidance data. Thesis weakens if SNDK cuts outlook or NAND pricing rolls over; the China-risk narrative gains substance if CXMT reports improving HBM yields and customer qualification.

Key Decisions for Investors

• Do not short SNDK solely on CXMT’s prepayment announcement; it is not evidence of incremental NAND supply or an immediate earnings hit.
• Put SNDK on a stabilization watch rather than buying the dip outright. Consider a defined-risk bullish options position only after price action settles and company guidance or NAND pricing corroborates demand; avoid open-ended exposure amid elevated volatility.
• Track SNDK guidance and NAND contract pricing over the next 1–3 months, and CXMT yield/qualification evidence over 6–18 months. A guidance cut or sustained NAND price deterioration falsifies the near-term resilience thesis; verified HBM customer adoption would raise longer-term competitive risk.
• If expressing a China-HBM competition view, compare exposure across SNDK, Micron and SK hynix rather than treating all memory makers as equally exposed; confirm product and customer overlap before establishing a relative-value trade.