Memory chip stocks, including major players like Micron and SK Hynix, experienced a significant downturn of over 4% due to broad market headwinds. The sell-off is primarily attributed to macroeconomic factors, including rising oil prices and concerns about higher borrowing costs, which has prompted institutional profit-taking in high-beta cyclical sectors like technology. This market-wide deleveraging from high-valuation tech stocks has overshadowed positive long-term fundamentals for the memory sector, such as strong demand for AI-related memory.