The KOSPI fell about 4% on Thursday, November 5, alongside an overnight selloff in AI and chip stocks on Wall Street that affected Korean semiconductor firms. The Korea Exchange activated a five-minute “sidecar” suspension of program trading after sharp moves in KOSPI 200 futures, as losses deepened from a previously recorded 1.02% decline. On November 6, South Korean financial authorities eased margin trading rules to limit forced stock liquidations and selling pressure linked to margin calls. Authorities also confirmed that market opening and closing times would be delayed by one hour on November 19 because of the national university entrance exam.
Chip and technology stocks led a November 6 selloff, as the Korea Exchange halted stock and derivatives trading for 20 minutes after the index’s sharp decline.
Read the full storyThe KOSPI index finished at 5,383.80 on November 5, 2026, driven by steep declines in Samsung Electronics and SK hynix amid U.S. regulatory concerns.