Philadelphia Semiconductor Index Falls 5.7%; Nvidia Drops 3.3% to $206.61, Market Cap Slips Below $5 Trillion

The symbolic weight of Nvidia slipping back below the $5 trillion threshold matters more than the 3.3% move itself: round-number market-cap levels tend to become psychological reference points for sentiment across the whole semiconductor complex. The 5.7% index decline is broad rather than Nvidia-specific, suggesting the pressure is running through the sector rather than through one name. Whether the index-level weakness persists independently of Nvidia's own trading is the open question worth watching.