Samsung Electronics and SK Hynix account for 99%; Bank of Korea reviews the stock market's "epic fluctuations"

The Bank of Korea, in its recently released "Monetary and Credit Policy Report for September 2026," reviewed the causes of fluctuations in South Korea's benchmark stock index since the start of this year. The report shows that as the KOSPI continued to climb, the contribution of Samsung Electronics and SK Hynix to the index's gains rose rapidly. In particular, during the KOSPI's surge from 8,000 to 9,000 points in June of this year, the two stocks contributed as much as 99% of the index's increase.