The Philadelphia Semiconductor Index plunged 6% on October 30, marking a sharp broad-based sell-off across major chipmakers. Intel led the decline with a staggering 29.6% drop, while AMD fell 9.48% and ARM slid 10.18%. Other heavyweight constituents also posted significant losses: Broadcom dropped 5.04%, Micron Technology declined 4.46%, TSMC fell 3.83%, and NVIDIA slipped 3.24%. The index's steep retreat reflects mounting pressure on the semiconductor sector amid widening intraday losses.