South Korea’s markets were hit hard on Friday 5th June 2026, with AI‑linked stocks leading a sharp regional sell‑off after Wall Street’s tech slump rippled across Asia.
The Kospi tumbled 5.54%, closing at 8,160.59, its steepest one‑day fall in months, as investors rapidly unwound positions in semiconductor and AI beneficiaries.
Heavyweights Samsung Electronics and SK Hynix were at the centre of the decline, sliding 6.40% and 9.92% respectively. This demonstrates how tightly exposed Seoul’s market has become to the global AI cycle.
The pullback followed a sharp rotation out of chipmakers in the United States, triggered by disappointing revenue data from Broadcom. This shook confidence in the sector’s near‑term momentum.
With AI names having powered much of 2026’s rally, even a modest earnings wobble proved enough to spark a broader de‑risking.
Domestic strain
Domestic pressures added to the strain. South Korea’s labour minister urged major tech firms to share more of their AI‑driven semiconductor profits with workers and suppliers. This is a signal that political scrutiny of the sector is rising just as global sentiment cools.
For now, the sell‑off looks like a reminder of how tightly South Korea’s market is tethered to global AI expectations.
If Wall Street’s AI led enthusiasm falters, Seoul’s tech giants may face a more prolonged test.