The earnings report, due June 24, is being closely watched as a barometer of global artificial-intelligence spending and demand for high-bandwidth memory, an area dominated by South Korean chipmakers.
The KOSPI rose 1.2 percent to 9,156.81 by late morning in Seoul, lifted by gains in SK hynix, Samsung Electronics and LG Electronics, despite continued foreign selling and weakness in smaller growth shares.
Japan's Nikkei 225 climbed 1.8 percent to a fresh all-time high of 72,522.95, while China's Shanghai Composite was little changed, edging up 0.03 percent to 4,091.54 as investors remained more selective.
Korea's rally was heavily concentrated in a handful of large-cap technology names.
SK hynix surged 4.9 percent to 2,899,000 won as investors continued to pile into memory chip makers expected to benefit from surging AI infrastructure spending. Samsung Electronics gained 0.7 percent to 356,500 won, while LG Electronics jumped 11.1 percent to 235,000 won, making it one of the strongest performers on the benchmark index, on reports of a group-wide executive-level visit to Nvidia.
Hyundai Motor fell 3.9 percent to 589,000 won, limiting broader advances, while the tech-heavy KOSDAQ slid 1.0 percent to 956.54, underscoring the narrow leadership behind Seoul's record run.
Foreign investors also remained unconvinced. Overseas investors sold a net 1.5 trillion won worth of local equities during morning trading, while institutions bought 616 billion won and retail investors purchased 865 billion won.
Japan enjoyed a broader rally. The Nikkei 225 added 1,272.89 points to 72,522.95, extending its historic climb after becoming the first Japanese benchmark to surpass the 72,000 level. The index has gained more than 2,500 points since breaking above 70,000 last week.
The broader TOPIX also advanced, signaling participation across multiple sectors rather than the narrow technology-led gains seen in Seoul.
Chinese equities stayed stagnant. The Shanghai Composite rose just 0.03 percent to 4,091.54, while the Shenzhen Component added 0.8 percent to 16,160.18, as investors remained cautious despite the regional enthusiasm surrounding AI-related sectors.
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