SK Hynix, Micron (MU) Join Trillion-Dollar Club as AI Demand Soars

SK Hynix and Micron Technology (MU) each surpassed $1 trillion in market capitalization within 24 hours, as the artificial intelligence boom fuels explosive demand for memory chips. On May 27, 2026, South Korea’s SK Hynix saw its valuation cross the milestone, a day after Micron reached the same threshold, making them the latest semiconductor firms to hit the 13-figure mark. The surge pushed Seoul’s benchmark KOSPI index to an all-time high, reflecting broad investor enthusiasm for AI infrastructure. Both companies are key suppliers of high-bandwidth memory (HBM) chips essential for Nvidia’s AI accelerators. Micron’s stock has more than doubled over the past year, while SK Hynix shares have tripled, with analysts citing nearly sold-out capacity for advanced HBM products through 2027. The milestones underscore a dramatic reshuffling of the global chip industry, where companies tied to AI hardware are outpacing traditional semiconductor leaders, as data center spending accelerates.