Stock Market Today, Oct. 28: SK Hynix Surges on Record Q3 Results and AI-Memory Demand
SK Hynix surged 13.30% on October 28, 2026, following record Q3 results with a sevenfold jump in operating profit and an 80% operating margin. The memory chipmaker's strong performance was driven by robust AI-memory demand, with DRAM and HBM production effectively sold out through 2029. Peers Micron Technology and SanDisk also rallied on the positive sentiment around AI-memory demand.