On May 27 the KOSPI index reached an all-time high of 8,450.26, up as much as 5 percent, with SK Hynix and Samsung Electronics together accounting for half the index's market capitalization. SK Hynix attained a market capitalization of 1,624 trillion won (US$1.08 trillion) while Samsung Electronics had crossed US$1 trillion on May 6 and Micron Technology reached the same threshold on May 26. Year-to-date gains through May 27 stood at 98 percent for the index, 165 percent for Samsung Electronics, 245 percent for SK Hynix, and 214 percent for Micron Technology.