▲ Financial data is displayed on a screen at Hana Bank's dealing room in central Seoul on Sept. 30, 2026. (Yonhap)

SEOUL, Sept. 30 (Yonhap) -- South Korean shares retreated Wednesday as rising U.S. Treasury yields raised concerns over higher borrowing costs and dampened investor sentiment. The Korean won weakened against the U.S. dollar.

The benchmark Korea Composite Stock Price Index (KOSPI) fell 32.77 points, or 0.48 percent, to end at 6,838.04, marking its third consecutive session of losses.

Overnight, U.S. stocks ended slightly lower despite a decline in oil prices, as persistently high Treasury yields kept investors cautious.

Global bond yields have risen to multi-year highs amid concerns that elevated energy prices could keep inflationary pressures high and lead to further interest rate hikes.

The yield on the 30-year U.S. Treasury topped 5.6 percent, its highest level in 24 years, while the benchmark 10-year yield remained above 5.2 percent, its highest level since 2007.

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