On September 21, propelled by the sustained surge in demand for artificial intelligence, chip stocks witnessed a broad-based rally during the US stock trading session. Notably, AMD's stock price skyrocketed by over 9% during intraday trading, reaching an all-time high of $613.92 at one point. This surge propelled the company's market capitalization beyond the $1 trillion threshold. AMD is recognized as one of Nvidia's primary rivals in the graphics processing unit (GPU) market. It has now joined the ranks of Nvidia, Broadcom, and Micron Technology as the fourth US chipmaker to achieve a market cap exceeding $1 trillion. Nvidia's market capitalization surpassed the $1 trillion mark in 2023, and it has since ascended to become the world's most valuable company, boasting a market cap in excess of $5 trillion. On Monday, the majority of chip stocks experienced concurrent gains, with Intel's stock price climbing approximately 11%, Qualcomm rising by 4.1%, and the Philadelphia Semiconductor Index surging by 2.6%, marking a one-month peak.