SEOUL — South Korea's benchmark KOSPI index traded above 7,100 for a third consecutive session Wednesday, standing at 7,100.45 by mid-morning, up 82.54 points, or 1.18%, as gains on Wall Street's technology-heavy Nasdaq Composite and easing tensions in the Middle East continued to lift sentiment across Asian markets.

The index opened sharply higher Wednesday, jumping 136.08 points, or 1.94%, to 7,153.99 at the opening bell, before paring some of those gains through the morning session. The rally tracked another record close for the Nasdaq Composite overnight, which rose 0.45% to notch its second consecutive all-time high, driven by continued strength in technology shares. The Philadelphia Semiconductor Index also posted a sharp advance, climbing more than 4% in the prior U.S. session, further reinforcing the bullish tone carrying into Wednesday's trading in Seoul.

Foreign and institutional investors led the buying that pushed the index back above the 7,100 level Wednesday, according to local market reports, continuing a pattern of strong overseas and institutional demand for Korean equities that has characterized much of the past week's rally. The KOSDAQ, South Korea's smaller technology-focused exchange, also advanced Wednesday,........

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