South Korea's benchmark KOSPI index tumbled 11% in a session flagged by crypto exchange Bitrue as a sign that the AI infrastructure trade underpinning much of this year's tech rally may be losing steam. The selloff hit chipmakers even harder than the broader index, with Samsung Electronics and SK Hynix — two of the world's largest memory chip producers — each plunging more than 13%.
Both companies have been central to the AI buildout narrative that has driven substantial gains across Asian tech markets, given their roles supplying high-bandwidth memory and other components critical to AI data-center infrastructure.
Why chipmakers led the decline
Samsung and SK Hynix carry outsized weight on the KOSPI, meaning a sharp move in either stock has an amplified effect on the broader index. Their double-digit percentage declines outpacing the index's own 11% drop suggests investors were specifically repricing AI-infrastructure exposure rather than reacting to a broader, unrelated macro shock.
A test for the AI trade narrative
The move comes as traders across global markets have grown increasingly split on whether valuations tied to AI infrastructure buildout — data centers, memory chips, and related hardware — have run ahead of near-term fundamentals. A drop of this magnitude in two of the sector's most closely watched suppliers raises the question of whether the pullback is a temporary reset or the start of a more sustained repricing.
What traders are watching next
Bitrue's framing of the move — positioning it as a moment to decide between "buying the dip or shorting the move" — reflects the split reaction typically seen after a sharp single-session decline in a high-momentum sector. Whether Samsung and SK Hynix stabilize in subsequent sessions will likely serve as an early signal for sentiment toward AI-linked equities more broadly, given how closely the two stocks are tied to global chip supply chains.
