AMD Briefly Surpasses $1 Trillion Market Cap on AI Chip Rally

Advanced Micro Devices briefly surpassed a $1 trillion market capitalization on Monday, September 21, 2026, marking a major milestone for the semiconductor company as its stock surged on strong demand for artificial intelligence chips. The stock reached a record intraday high of $613.92, pushing its valuation above the trillion-dollar threshold before settling slightly lower. The move makes AMD the fourth U.S. chipmaker to achieve this valuation, following Nvidia, Broadcom, and Micron. The rally was part of a broader surge in semiconductor stocks, with the Philadelphia Semiconductor Index rising more than 4%. Intel shares jumped approximately 12%, and Arm Holdings gained about 15%. The sector-wide momentum was fueled by renewed investor enthusiasm for AI-related demand, partly attributed to the recent success of Meta Platforms' Muse AI agent, which topped Apple's App Store free applications chart. AMD's stock has risen more than 180% in 2026, significantly outperforming the Nasdaq's 15.8% gain. The company's financial results have underpinned the growth. In the second quarter of 2026, AMD reported revenue of $11.5 billion, a 50% increase year-over-year.