Micron Falls 5%, SanDisk Sinks 6%, Western Digital Drops 7% as Higher Rates Test the Memory Boom

Key Points:

• Memory and storage stocks, including Micron Technology, SanDisk, and Western Digital, are experiencing significant sell-offs due to rising Treasury yields increasing the cost of capital and pressuring valuations in the semiconductor sector.
• Despite sharp declines (Micron down 5%, SanDisk 6%, Western Digital 7%), the pullback reflects a valuation reset rather than changes in memory fundamentals such as pricing, supply, or demand.
• Higher Treasury yields raise discount rates for future earnings and increase financing costs for capacity expansion, disproportionately impacting heavily appreciated and growth-dependent memory stocks.
• The memory sector's strong 2026 performance (Micron up 255% YTD, SanDisk 653%, Western Digital 211%) suggests the sell-off is a macro-driven derating rather than company-specific issues, with AI infrastructure demand still supporting long-term fundamentals.
• Investors should monitor Treasury yield trends, memory contract pricing, and technical stock levels while maintaining cautious position sizing due to the sector's volatility and the macroeconomic-driven nature of the current correction.