SK Hynix (000660.KS) Surges to $1 Trillion Market Cap, Joining Micron (MU) in AI Memory Rally

SK Hynix (000660.KS) climbed into the $1 trillion valuation club on May 27, 2026, as shares jumped 12%, a day after Micron Technology (MU) crossed the same milestone. The surge underscores a deepening supply squeeze in high-bandwidth memory (HBM) chips, essential for AI training and inference. HBM production at SK Hynix, Samsung Electronics (005930.KS), and Micron is booked through 2026, driven by soaring AI workloads. SK Hynix shares have rallied 248% year-to-date, Samsung 165%, and Micron over 210%. UBS more than tripled its Micron price target to a Street-high $1,625, citing a structural shift in memory demand from AI. The memory chip rally has helped lift the S&P 500 and Nasdaq Composite to record highs.