The Kospi was down 6% on Monday, or 443 points to 7,031, as an unkind reversal in AI-linked names ran up against a stronger dollar and rising oil. It is a fall that puts in question the idea of 2026’s top market making easy work of tighter global conditions, now that it is well below its June high.
A record year meets a harsh reset
Even with 63% in the bag for 2026, putting it ahead of most of the world, the index has been hit hard. The outperformance was no accident – you had AI-semi momentum and solid earnings for that – but what happened on Monday has put the market back in technical bear country.
You could see it in early trade: the Kospi was already in the red by 5.6 percent at 7,058.82. SK hynix opened 10.1 percent lower, a stark contrast to the 13 percent its US shares put up on Friday in New York. It shows how different the risk appetite is at home from the listing buzz abroad.
What rattled investors today
There was a macro shock coming from geopolitics. Tensions in the Gulf and Iran’s word on the Strait of Hormuz put a bid under oil, and with it came old inflation fears and a pummelling of any equity sensitive to rates. The U.S. dollar and bond yields firmed as the talk of another Fed hike grew.
Then there is the matter of Chair Kevin Warsh, who is to face Congress for the first time since he took the job. That kind of policy uncertainty in a thin session, on top of some very full AI positions, made de-risking the only option.
Some of the intraday figures to put in perspective:
– A 6% slide for the Kospi, 443 points to 7,031
– SK Hynix gave up 10%
– Samsung Electronics was down over 6%
– Not to be confused with SK hynix US stock, which was up nearly 13% on Friday
AI trade under pressure
It is a one-sided market in South Korea. Put SK hynix and Samsung together and they are close to half the index; when the mood sours, the swings are all the more pronounced. Some of the more levered semi bets were put to the test last week in an 8% decline.
And there is the question of whether the AI spending frenzy is for real. This correction has some wondering if the semiconductor run-up has left fundamentals in the dust, and the market is left open to being called on it.
Earnings strength vs valuation gap
On paper, things were in order before the letdown. You have 17 straight months of upgraded estimates for Kospi companies, a run not seen in nine years. High memory prices and a build-out in AI have been the reason for it.
Valuations don’t tell the same story, however. The Kospi P/E is about a third of what you see in Taiwan. There is a healthy dose of scepticism there over the concentration and the cycle, even with these firms so integral to the AI supply side.
Why the stakes are high now
This was no one-day fluke. With the index 25% from its June top, it is a trial for those who have put their money in the AI cycle and in this market. What was a short-lived bear move last week has deepened, and the momentum is no longer there to be taken for granted.
Traders are looking at a confluence of issues:
– Inflation and policy questions stoked by oil
– Too much in a few AI semis
– Nerves still raw from the 8% drop of last week
What to watch next
Energy and rate expectations will set the tone for the near term. All eyes will be on Warsh in Washington for a read on policy, while the market sizes up whether the capital plans for AI can put some calm back into the room for the local chipmakers.
For the moment, the friction is there. A 63% gainer with 17 months of better numbers is running up against a wall of valuations, geopolitics and an overdone AI trade. Whether Monday was the end of the road or just a step down is yet to be seen.
