South Korea's KOSPI Surges Nearly 2% as Record Chip Exports Boost Market
nashnova research
South Korea's KOSPI closed up 1.95% Thursday, reversing a midday selloff on the back of surging chip stocks; September exports jumped 83.5% year-on-year to a single-month record, with semiconductor shipments more than tripling on global AI spending — the question now is whether that pace can survive Q4 base effects.
The index was down 1.1% intraday — what turned it around?
KOSPI closed up 133.31 points at 6,971.35, snapping a three-day losing streak and posting its biggest single-day gain since September 18.
The index fell as much as 1.1% during the session before chip stocks staged a full reversal.
This means → the turnaround was not broad-based — it was driven almost entirely by Samsung Electronics (+2.79%) and SK Hynix (+3.21%), two heavyweight index components.
Why did the export data electrify the market?
South Korea's September exports surged 83.5% year-on-year to $120.9 billion, a single-month record that crushed the consensus estimate of 62.0%.
Semiconductor shipments more than tripled, powered by global AI capital spending — the standout line in the entire dataset.
In plain terms = companies worldwide are scrambling to buy AI chips, and South Korea happens to be the world's largest memory-chip producer — that demand wave pushed exports to an all-time high.
What does Micron's guidance add to the picture?
Micron Technology issued quarterly revenue guidance above consensus the day before, and disclosed that customer long-term supply commitments had risen to $32 billion.
This means → AI memory demand is not a one-off buying spree — downstream customers are locking in capacity with multi-year contracts, signaling high demand visibility.
This reflects the logic behind Samsung and SK Hynix leading the rally: as Micron's direct competitors, they ride the same wave of pre-committed orders.
Is the manufacturing PMI telling the same story?
S&P Global data showed South Korea's September manufacturing PMI rose to 53.9 (above the 50 expansion threshold), with export-order growth at its fastest pace in over 15 years.
The drivers were chips and autos together — semiconductor demand was not the only engine.
In plain terms = the PMI confirms this is not a single-data-point spike; the entire manufacturing sector's health is improving.
How did flows and FX react?
Of 916 traded names, 542 rose and 332 fell — a solid majority gained.
But foreign investors were net sellers of ₩547.3 billion (roughly $403 million) on the day — the rally was domestically funded.
The won traded at 1,358.4 per dollar, weakening 0.20% from the prior close; the 3-year government bond yield dipped 0.2 bp to 4.009%, while the 10-year benchmark rose 2.8 bp to 4.429%.
What should investors watch next?
Mirae Asset Securities analyst Seo Sang-young said: "We still need to see whether the growth rate can continue to improve."
The key variable: as Q4 begins, base effects kick in — exports were already recovering a year ago, so year-on-year growth rates are likely to moderate naturally.
This means → whether the chip-sector rally can last depends not on the absolute export number but on whether the growth rate can hold up against a rising base. South Korea's finance minister has signaled authorities will monitor markets closely and act pre-emptively if needed.
市场有风险，内容仅供研究参考，不构成投资建议。