South Korea's two memory chip giants tumbled on Thursday, July 2, in one of the most dramatic selloffs in recent market history, with SK Hynix falling approximately 14.6% and Samsung Electronics dropping about 9%. The selling was so severe it forced an emergency trading halt on the Kospi, South Korea's main stock index.
The crash came as the global AI selloff that began on Wall Street spread to Asian markets, triggering fears that the massive AI infrastructure spending cycle may take years to deliver returns.
A Market in Panic
The Kospi fell as much as 6% at one point, triggering an automatic circuit breaker that briefly paused trading before losses eased. SK Hynix and Samsung together make up roughly half the entire value of the Kospi, so when both stocks drop simultaneously, they drag the entire market down.
SK Hynix shares had risen 307% year-to-date before the crash, while Samsung had gained 179%, reflecting the enormous optimism that had been priced into AI-related memory stocks.
Perfect Storm of Negative Sentiment
The trigger came after U.S. chip stocks slumped overnight, with Micron falling about 10% earlier in the week. The selloff reflects growing investor nervousness that heavy AI spending may take years to pay off — a sentiment shift that has been building for weeks.
Reuters reported on Thursday that Samsung and SK Hynix are "making one of the biggest bets yet on the artificial intelligence boom with investments worth hundreds of billions of dollars, but the planned capacity buildout is stoking fears of a painful reckoning if AI spending cools."
Brutal Timing
The crash comes at a particularly unfortunate moment. Just days earlier, South Korea's government unveiled plans for Samsung and SK Hynix to invest a combined 800 trillion won (more than $500 billion) in a national chip ecosystem project.
Even more critically, SK Hynix is scheduled to list on the Nasdaq on July 10 — a major milestone for the company. The brutal selloff ahead of its U.S. market debut creates significant uncertainty about investor reception.
What Analysts Are Saying
Market analysts described the selloff as driven by fear and volatility rather than a collapse in real demand. Memory chips for AI applications remain in short supply, supporting the long-term case for both companies. However, short-term headwinds from interest rate concerns and shifting AI sentiment could keep markets volatile.
For investors, the episode underscores that AI memory has become a single, connected global trade, with developments on Wall Street now instantly reverberating through Seoul and Tokyo.
