SK Hynix shares closed up 12.5%, hitting a record closing high.CoinLiveMay 4, 2026 at 01:42 AMSouth Korea's KOSPI index closed up 338.12 points, or 5.12%, at 6936.99 on Monday, May 4, a record high. SK Hynix shares closed up 12.5%, also a record closing price. (Jinshi)