Intel's stock price rose primarily due to short covering, following a 24% decline in its share price over the past month. Meanwhile, AMD's stock price increased, benefiting from a 57% year-over-year growth in its data center business. The iShares Semiconductor ETF (SOXX) also rose by 6% to $540, reflecting a broad upward trend in the semiconductor sector. The Nasdaq 100 index gained 2.8% on the day, with decreased market volatility and traders actively shifting towards growth and cyclical stocks, which fueled the overall rebound in semiconductor shares.