The semiconductor sector is experiencing a significant downturn, with the SOXX ETF falling -3.94%, as investors take profits in memory chip stocks that have seen substantial gains year-to-date. Key players like SK Hynix, Micron, and SanDisk are leading the decline amidst broader concerns about high valuations and the sustainability of the recent AI-driven rally. The sell-off comes despite a strong earnings report from chip-equipment maker ASML, indicating the current pressure is specific to the memory sub-sector.