The Kospi has proved it can rally. The harder test is whether Korean companies can keep commanding higher valuations after the momentum fades. That challenge li

The benchmark Kospi gained as much as 4.8% on Thursday, extending its gain from a July 30 low to around 22%. Heavyweight memory chipmakers Samsung Electronics Co. and SK Hynix…

South Korea's Kospi has staged a reversal from its latest rout, returning to bull-market territory as investors piled back into the semiconductor giants that dominate the index.