The country's benchmark stock index Wednesday briefly topped another historic milestone of 4,600 a day after closing at an all-time high of above 4,500 on an extended chip rally. The benchmark Korea Composite Stock Price Index (KOSPI) was at 4,559.59 at 10:12 a.m., up 34.11 points, or 0.75 percent from the previous session's close, after hitting an intraday high of 4,611.72. On Tuesday, the KOSPI rose 1.52 percent to close at an all-time high of 4,525.48, backed by a rally in semiconductors, brokerages and shipbuilders. Investors are closely watching whether the main index will sustain its rally and close above the 4,600-point level, supported by continued strength in technology stocks.