The Story
For a few days in mid-May, Wall Street traded as if a US-China deal were already signed. The S&P 500 closed at 7,412.84 on May 11, the Nasdaq set a record at 26,274.13, and by mid-week the Dow had clawed back above 50,000 — a rally powered by the AI trade, with Nvidia and AMD doing most of the lifting. The logic going into the week was simple: Trump was flying to Beijing for the first leaders’ summit of his term, and markets had decided the meeting could only help.
Korea ran even hotter. On May 14, as Trump landed in Beijing, the KOSPI closed at a fresh record of 7,981.41, up 1.8%. Some of that was the same AI boom lifting everyone. But part of it was a specific summit headline: Nvidia had reportedly been cleared to sell its H200 chips to major Chinese customers. For a semiconductor-heavy index like the KOSPI, that is a direct tailwind — and the market grabbed it.
Then the summit actually happened, and the gap between what markets had priced in and what the two leaders delivered snapped shut.
Trump and Xi met for about two hours and 15 minutes at the Great Hall of the People to open a two-day summit. The communiqué that followed was long on framing and short on enforceable substance. The two sides agreed to a “constructive relationship of strategic stability” — a framework meant to hold for three years. China would order 200 Boeing jets, a figure Trump said could eventually reach 750. China would “address US concerns” on rare earths and critical minerals. Xi would visit the US in the fall. Xi also delivered a pointed warning on Taiwan, and the Iran war took up a large share of the agenda.
What the summit did not produce was a single hard, enforceable agreement on the things that actually move corporate earnings — tariffs, export controls, the rare-earth chokepoint. UBS economist Paul Donovan summed up the Street’s verdict bluntly: “nothing of real substance.”
So markets did what they always do when an event under-delivers against a priced-in expectation. They sold.
On Friday, May 15, every major index outside the US fell. Korea’s KOSPI dropped 6.12%, surrendering its record in a single session. Japan’s Nikkei 225 lost 1.99%, China’s CSI 300 fell 1.12%, Europe’s Stoxx 600 lost 1.28%, and the FTSE 100 fell 1.42%. S&P 500 futures were down 1% before the open, and the index ended Friday off 1.24%. Boeing — supposedly the summit’s headline winner — fell 3.8%, because a 200-jet order looked thin next to the 300 planes China bought on Trump’s 2017 visit and the 500 that White House sources had floated beforehand.
Here is the number that frames everything else, though. For the full week, the S&P 500 still finished up roughly 0.13% — its seventh straight weekly gain, the longest streak since December 2023. The US market wobbled on the summit and shrugged it off. Korea fell 6% in a day.
(Figures as of market close, May 15, 2026.)
The Takeaway
The cleanest way to read this episode: the Trump-Xi summit was a “sell the news” event. Markets spent the week pricing in a deal. The leaders delivered a vibe — “strategic stability” — and a vibe is not a deal. The selloff was not markets deciding that US-China relations had deteriorated. It was markets repricing back down to reality after getting ahead of themselves.
But the part actually worth sitting with is the gap: the US fell 1.24%, Korea fell 6.12%, on the very same news. Same summit, same disappointment, wildly different damage. Why?
Three reasons, and only one of them is structural. First, a chunk of Korea’s drop was not the summit at all — Samsung Electronics fell 8.6% on its own news, an 18-day strike by more than 45,000 union workers set to begin May 21. Second, the KOSPI had closed at an all-time high the day before, so it simply had the most to give back; mean reversion from a record is not the same as a crash. Third — and this is the structural part — Korea does not really trade the summit. It trades as a leveraged proxy for US-China tension. A small, open, export-driven economy whose biggest index is built on chips sits directly in the blast radius of every tariff and export-control headline. The same H200 news that lifted the KOSPI on May 14 was the most exposed to the “no real substance” verdict on May 15.
That asymmetry is the recurring pattern. Korea amplifies both the optimism and the disappointment. It is the door capital uses when it wants exposure to the US-China story — and the door it uses to leave.
The second thing to hold onto is what the summit did not change. It lowered the near-term escalation risk, which is real and worth something. But tariffs, export controls, and the rare-earth chokepoint were all left untouched — and China still controls most of the world’s rare-earth refining and magnet manufacturing, the genuine pressure point for chips, robotics, and defense. “Strategic stability” is a ceiling on how bad things can get over three years. It is not a floor under how good they can get. The structural risk that matters to corporate earnings is exactly where it was on May 13.
For an ordinary investor, the useful lesson here is not about China policy — it is about pricing. When everyone agrees in advance that an event will be good, the good is already in the price, and the risk runs asymmetrically to the downside. The KOSPI at a record on the morning of May 14 was not the safe moment. It was the most expensive one. The boring discipline of asking “what is already priced in?” would have done more for a portfolio this week than any summit forecast.
This article is for informational purposes only and is not investment advice.
Photo: Maxim Hopman / Unsplash
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