AMD Crosses $1 Trillion Market Cap on September 21, Fourth US Chipmaker to Reach Milestone as AI Demand Fuels 187% Year-to-Date Rally

Advanced Micro Devices briefly surpassed $1 trillion in market capitalization for the first time on September 21, 2026, with shares surging approximately 9 to 10 percent to around $610-615, making it the fourth US chipmaker to reach the milestone after Nvidia, Broadcom, and Micron, according to multiple sources including Reuters, GuruFocus, and CNBC. AMD stock has climbed 187 percent year-to-date from its January open near $223.47, driven by data center revenue that more than doubled year over year and investor bets that AMD is the credible number-two supplier of AI accelerators behind Nvidia. AMD's second-quarter revenue reached $11.54 billion, up 50 percent from a year earlier, with net income of $2.29 billion, up 163 percent, reflecting surging demand for computing power driven by artificial intelligence deployments. The rally marks a dramatic shift in semiconductor valuations, with only roughly 14 to 15 publicly traded companies worldwide now commanding market capitalizations above $1 trillion. AMD now trades at a market value exceeding longtime rival Intel by more than $352 billion, even as the two compete head-to-head in server CPUs and graphics. The milestone matters because it signals the extent to which AI infrastructure has reshaped capital flows in the chip sector. AMD's valuation surge reflects institutional conviction that the company has secured a durable position in the data center silicon stack, where hyperscaler capital spending continues to scale. The move also underscores how concentrated the AI infrastructure trade has become, with just four chip names now holding trillion-dollar valuations while legacy players like Intel remain well below.