Nikkei marks record closing high as AI shares rally on Micron forecast

Japan's Nikkei index surged 4.6% to a record closing high of 72,366.34, snapping two sessions of declines, as AI-related shares rallied after US memory chipmaker Micron forecast quarterly profit and revenue well above expectations and disclosed $22 billion in customer commitments for memory chip supply. The broader Topix rose 1.33%, with chip-testing firm Advantest jumping 15%, chip-making equipment maker Tokyo Electron up 7.78%, memory chipmaker Kioxia advancing 12.27%, and SoftBank Group climbing 8%. Energy and mining stocks bucked the trend, declining as oil prices extended losses.