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Advanced Micro Devices' stock rally extended to a fifth straight session, pushing its market capitalization above $1 trillion for the first time and making it the 14th U.S. company to reach that threshold. The stock has surged more than 180% in 2026, fueled by strong investor demand for AI-related chipmakers. The rally coincided with a broader move higher in semiconductor shares after four new companies were added to the Philadelphia Semiconductor Index (SOX), with AMD notably breaking out to fresh highs. The additions and AMD's technical breakout underscored intensifying investor enthusiasm for chip stocks tied to AI infrastructure spending.