The semiconductor sector experienced a significant downturn, with the SOXX ETF dropping over 3%. The sell-off appears to be driven by mounting investor concerns over high valuations following a period of strong performance. A notable drop in SK Hynix shares contributed to the negative sentiment, sparking broader profit-taking across the industry. Despite strong earnings from market leader TSMC, the negative momentum prevailed, indicating a sector-specific rotation as investors cash in on recent gains.