Svmuu News According to Gate data, major stock indices in Japan and South Korea opened at record highs. The Nikkei 225 index opened up 487.71 points, or 0.78%, at 63,201.36 points on Monday, May 11; the KOSPI index opened up 288.73 points, or 3.85%, at 7,786.73 points on Monday, May 11. Samsung Electronics opened up more than 5%, and SK Hynix rose over 8%, both hitting new all-time highs.