The index closed at around 8,799 points, up 0.1 percent, after having fallen more than 1 percent around midday on oil-price nerves before clawing the entire loss back by the close.
Beneath the surface, the top performers that had defined the rally for months gave way. Money rushed out of the semiconductor giants that carried Monday's record, with SK hynix and Samsung Electro-Mechanics both falling, and into three very different destinations: the companies expected to meet Nvidia's visiting chief executive, the robotics names riding the same theme, and a startling rotation into South Korea's long-discounted financials.
The biggest of those was a genuine surprise. Samsung Life Insurance soared nearly 15 percent to around 471,000 won (US$311.9), leading the single best-performing sector on the day, as some investors began to look past the crowded AI trade toward value names that have lagged most of the year.
The robotics and telecom moves, by contrast, ran on what local investors are calling the "Jensen Huang effect": with Nvidia's chief executive due in Korea this week after appearances at Computex and GTC Taipei, SK Telecom surged more than 12 percent to around 126,000 won on hopes tied to sovereign AI infrastructure, while Doosan Robotics jumped more than 20 percent to around 167,000 won, with Huang expected to meet Doosan's chairman and to throw the ceremonial first pitch at a Doosan Bears baseball game.
China's Shanghai Composite was the region's quiet outperformer, rising about a third of a percent to around 4,070, a clear break from its recent habit of trailing Seoul and Tokyo. The driver was structural: the Shanghai Stock Exchange has raised the weightings of technology and chipmaking stocks in its key indexes this month, a change Goldman Sachs estimates could draw in roughly 3 billion dollars of fresh inflows.
That lit a fire under China's chip-sovereignty names. Cambricon, often described as China's answer to Nvidia, jumped more than 5 percent to around 1,300 yuan, while SMIC, the country's largest foundry, edged up to around 133 yuan. CNOOC rose nearly 1 percent to around 35 yuan as oil held firm.
Japan's Nikkei 225 was the region's only decliner, slipping about a third of a percent to around 66,734, though the headline masked an important detail: the AI trade did not unwind. SoftBank Group, after Monday's historic surge that made it Japan's most valuable listed company, held its ground and edged up about half a percent to around 8,592 yen, while Advantest, the chip-testing equipment maker, rose more than 2 percent to around 26,200 yen.
What dragged the index lower was the old economy, as Toyota Motor fell about 2 percent to around 2,846 yen, extending Monday's decline as investors kept rotating out of the traditional exporters.
The day's pattern across the region pointed to an AI trade that is broadening rather than breaking. In Korea it spread out from memory chips into robotics, telecom, and even life insurers; in China it rotated into domestic chipmakers on an index reshuffle; in Japan it held firm even as the broader index dipped.
Whether that breadth holds or the money rushes back into the chip leaders is likely to turn on two events now in view, Huang's Seoul visit this week and China's Politburo meeting in July, either of which could set the region's next direction.
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