South Korean stocks opened lower on Thursday, extending a three-day losing streak, as chip-heavy stocks dragged down the market. The benchmark Korea Composite Stock Price Index (KOSPI) fell 26.3 points, or 0.38 percent, to 6,811.74 as of 9:15 a.m. local time. This followed a mixed close on Wall Street overnight, where cooler-than-expected inflation data was offset by persistent pressure from elevated U.S. Treasury yields and rising oil prices.