Japan and South Korea's stock markets shed a combined $363 billion in value on July 8, and it's the clearest sign yet that this tech-led selloff cycle, which has now repeated multiple times over the past month, isn't done running its course.

The breakdown between the two markets is meaningfully different. Japan's Nikkei 225 fell 2.11 percent to close at 66,819.05, with the broader Topix down 1.37 percent, wiping out roughly 19.4 trillion yen, about $120 billion. South Korea's KOSPI took the far heavier hit, plunging 5.35 percent to 7,246.79, its lowest level since May 20, erasing around 366 trillion won, roughly $243 billion, and triggering a temporary trading curb during the session. Samsung Electronics dropped 6.25 percent and SK Hynix fell 5.68 percent, both hitting their lowest levels in over a month.

What makes this drop notable is that it came directly on the heels of Samsung's blockbuster earnings report, the same nineteen-fold quarterly profit surge covered earlier this week. Rather than celebrating the beat, markets fixated on the fact that Samsung's own shares had plunged as much as 10 percent despite the record profit, fueling exactly the kind of skepticism that's been building for weeks, that even extraordinary earnings can't keep pace with how far expectations for AI infrastructure spending have run. Reports that China's DeepSeek is developing its own AI chip added a separate competitive worry on top of that.

This also connects directly to the reignited Iran conflict. The same session saw Japanese and Korean equities tracking an overnight Wall Street selloff tied to renewed semiconductor weakness, compounded by the US launching fresh airstrikes on Iran following the tanker attacks in the Strait of Hormuz, pushing oil sharply higher and adding a second, unrelated source of risk-off pressure on the same day.

It's worth putting this in the context of just how much these two markets ran up beforehand. Even after this drop, KOSPI remains up roughly 75 percent year to date, still comfortably the best-performing major benchmark in the world, and this is now the third or fourth distinct circuit-breaker-triggering plunge the index has experienced in barely a month, following an 8 percent Bloomberg-reported drop on July 2 and a nearly 10 percent CNN-reported crash back in late June that briefly recovered days later. That pattern, sharp plunge, partial bounce, repeat, has become the defining rhythm of this market rather than a single decisive break.

Some analysts continue to argue this is a deleveraging event rather than a structural crack in the AI trade, pointing out Samsung still trades around six times forward earnings and SK Hynix around 5.3 times, a fraction of Nvidia's multiple, and that real overcapacity risk in memory remains years away. Others note foreign investors have net sold roughly $22 billion in Korean stocks since May, and some analysts have flagged that DRAM and NAND pricing could peak sooner than the market currently assumes.

For anyone tracking Korean semiconductor exposure or broader Asia-Pacific tech risk on Gate, the next concrete catalyst is SK Hynix's planned Nasdaq listing this Friday, which the market will likely read as an early signal of whether this repeated boom-bust pattern in Asian chip stocks is starting to stabilize or whether it has further to run, especially with the Iran conflict and Fed rate expectations still actively feeding into the same risk-off backdrop.
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