Major stock indices in Japan and South Korea opened at record highs on May 11, driven by significant gains in tech giants Samsung Electronics and SK Hynix. The Nikkei 225 rose 487.71 points, or 0.78%, to 63,201.36, while the South Korean KOSPI index surged 288.73 points, or 3.85%, to 7,786.73. Samsung Electronics saw a rise of over 5%, and SK Hynix climbed more than 8%, both reaching new record highs at the market open.