Let me paint a picture of this morning.
You open your phone. Korean stocks are down 8%. Trading has been frozen for 20 minutes. Samsung is down 11%. The won just hit its weakest level since 2009.
What on earth happened?
The short answer: three bad things hit at once. The longer answer is actually pretty interesting — because it tells you something real about how markets work.
The spark came from a chip company you might not have heard of
Broadcom is a US semiconductor company. Last Friday, it told investors to expect $16 billion in AI chip sales next quarter. Sounds like a lot, right? The problem is that markets were expecting $17.2 billion. That $1.2 billion gap sent Broadcom’s stock down nearly 13% in a single day.
A semiconductor — or chip — is the tiny component that powers everything from your phone to AI systems. Think of it as the engine inside the engine.
That drop dragged down the whole chip sector. An index that tracks US semiconductor stocks fell over 10% on Friday. And since Samsung and SK Hynix — Korea’s two biggest chipmakers — are deeply plugged into that same AI supply chain, Seoul opened Monday to a wall of selling.
Then the jobs report made things worse
Here’s one that surprises most people: the US economy added 172,000 jobs in May. That’s more than double what anyone expected. Good news, right?
Not for stocks. When employment is this strong, the US central bank — the Federal Reserve — is less likely to cut interest rates. And when rate cuts disappear from the picture, investors tend to pull money out of growth stocks like tech companies.
The Federal Reserve is America’s central bank. When it raises interest rates, borrowing becomes more expensive — which tends to weigh on stocks, especially fast-growing tech companies.
And then Iran fired missiles at Israel
The ceasefire that had been holding since April started to crack. Iran launched missiles at Israel on Sunday. Markets don’t like uncertainty, and a Middle East escalation means potential disruption to oil supplies. When that kind of news breaks, investors tend to rush toward safety — selling stocks and buying things like gold or government bonds.
This is called “risk-off” — when everyone heads for the exit at the same time.
Why Korea got hit harder than most
Samsung and SK Hynix together make up roughly half of Korea’s entire stock market by value. That’s an unusual concentration. It means when the global chip trade catches a cold, Korea gets pneumonia.
On top of that, a lot of Korean retail investors had been borrowing money to buy stocks — riding a market that had been surging. When prices fell fast enough, those positions got automatically sold, which pushed prices down even further.
Margin trading means buying stocks with borrowed money. If prices fall below a certain level, brokers automatically sell your holdings to cover the loan — which can accelerate a selloff.
So where does this leave things?
Goldman Sachs actually raised its 12-month target for the Korean market this week. Nvidia’s CEO visited Seoul and reaffirmed Korea’s role in the AI chip supply chain. The underlying demand story hasn’t changed — AI still needs memory chips, and Korea still makes the best ones.
What matters now is Wednesday’s US inflation data. If prices come in hotter than expected, rate hike fears will intensify. If they come in cool, this selloff might look like an overreaction in hindsight.
Markets often punish first and ask questions later. Today felt like one of those days.
My take: A circuit breaker, an emergency exchange meeting, and a 16-year low on the won — all before noon. The structure of Korea’s market made a bad day much worse. Worth keeping an eye on how the chip story develops from here.