The detail that mattered most in Tokyo was not the size of the advance but its composition. The engine was the so-called picks and shovels of the AI buildout, the companies that make the machines that make the chips. Tokyo Electron soared about 13 percent to around 60,700 yen, the single biggest force behind the record, while Advantest, the chip-testing specialist, added about 5 percent to around 27,700 yen.
The twist was that the rally's recent leaders sat it out. SoftBank Group, the AI-investment proxy that had surged to become Japan's most valuable listed company earlier in the week, fell about 3.5 percent to around 8,300 yen as investors took profits and rotated elsewhere. Even Toyota Motor, which had borne the brunt of the week's selling, bounced nearly 2 percent to around 2,900 yen. Wednesday's record was not the familiar SoftBank-led charge but a rotation within the AI trade, out of the high-flying proxy and into the equipment names that supply the industry.
The move carried a currency tailwind, with the dollar pushing briefly above 160 yen, a weak-yen boost for Japan's exporters. With the yen near 160, the pressure on the Bank of Japan to raise rates at its June meeting only builds, a tension that has shadowed the Tokyo rally for weeks.
Crude, meanwhile, rose more than a dollar a barrel after the week's de-escalation narrative sharply reversed. Secretary of State Marco Rubio told a Senate committee that Iran has mined large segments of the Strait of Hormuz, a concrete escalation that undercut the draft framework to reopen the waterway that markets had been pricing since late May. The reversal restores precisely the imported-inflation risk that has driven central-bank caution across the region, and it will greet Korean markets when they reopen Thursday.
China's Shanghai Composite finished essentially unchanged at around 4,077, once again failing to join the records being set in Tokyo, but the flat headline concealed a movement that echoed Japan's theme: the chip names led. Cambricon, the domestic AI-chip champion often likened to Nvidia, jumped about 5.5 percent to around 1,370 yuan, the standout of the session. NAURA Technology, China's own semiconductor-equipment maker, rose about 1 percent to around 609 yuan, a more modest move than Tokyo Electron's but the same picks-and-shovels logic taking hold, while SMIC, the country's largest foundry, was little changed near 133 yuan. CNOOC, the state oil producer, climbed about 2.5 percent to around 36 yuan as crude firmed on the Hormuz escalation. Gains in chips and oil were enough to keep Shanghai green, but only just, as old-economy names continued to weigh.
Across both of the day's open markets, the same signal stood out: the AI rally is maturing and rotating toward the equipment makers, even as crowd favorites like SoftBank pause for breath. That is what a broadening rather than a breaking rally looks like. The questions from here are whether the Bank of Japan moves in June, whether Shanghai can finally join a regional advance it has watched from the sidelines, and how Korean markets, reopening Thursday into a fresh oil shock, absorb a Hormuz reversal that lands just as the Bank of Korea was beginning to see currency relief.
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