Seoul stocks surged Wednesday, led by gains in chipmakers and other big-cap tech shares, as hopes grew for a possible end to the U.S.-Iran conflict. The Korean won strengthened sharply against the U.S. dollar.

The benchmark Korea Composite Stock Price Index (KOSPI) rose 426.24 points, or 8.44 percent, to 5,478.7, snapping a four-day losing streak.

Wednesday's gain marked the second-largest increase ever, with the sharpest gain recorded on March 5 when the index jumped 490.36 points.

Trade volume was moderate at 942.93 million shares worth 27.31 trillion won (US$18.19 billion), with winners outnumbering losers 837 to 70.

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