The Nasdaq Composite Index saw its intraday losses widen to over 1.5% on June 9, while the S&P 500 declined by 1%. The Philadelphia Semiconductor Index experienced a significant drop of 3.7%, with major semiconductor companies facing sharp declines. Qualcomm's shares fell 7.5%, Intel's dropped 3.6%, and Micron Technology's decreased by 4%, contributing to the broader market downturn.