South Korea’s KOSPI jumps 4%, SK Hynix up over 7%

A single-session move of this size in the KOSPI, led by Samsung Electronics and SK Hynix rather than broad participation, points to index concentration doing much of the work. That matters because Korean equities are often read as a proxy for memory-chip demand, and moves this sharp tend to reflect a repricing of that outlook rather than company-specific news, which the item does not supply. The open question is whether the gains hold through the close and whether the rally broadens beyond the two chip names; a narrow, one-day spike carries a different signal than a sustained, wider advance.