Inside the $1.3 Trillion Chip Sell-Off That Broke South Korea's Market — and the Rebound 24 Hours Later

Shock 2 — The U.S. jobs report overshoots (June 5). The Bureau of Labor Statistics reported that 172,000 nonfarm payrolls were added in May — nearly triple Goldman Sachs's forecast and almost double the consensus estimate of roughly 89,000 . It was the third consecutive upside surprise. Treasury markets reacted immediately: interest-rate swaps moved to fully price in a quarter-point Fed rate hike by the December meeting, with roughly 50–60% odds of a move as early as October .

Over the weekend, those two forces — AI growth doubts and genuine rate-hike fear — converged, and Asian markets opened Monday in a cascade of forced selling.

The Monday rout: Kospi breaks, global chips bleed

South Korea's Kospi took the worst hit. The index fell 8.3% to 7,484.41, its largest single-day drop since March, and tripped a Level 1 circuit breaker at 9:03 a.m. local time after opening down roughly 9% within three minutes . It was the first Kospi trading halt in over four years .

Large-cap chipmakers led the collapse:

• Samsung Electronics fell 10.2%
• SK Hynix declined 7.7–10%

The technology-heavy KOSDAQ index sank 7.5% . Across Asia, the rout was broad but shallower outside Seoul:

• Japan's Nikkei 225 dropped 3.9% to 64,024
• Taiwan's Taiex fell 3.5%
• Hong Kong and Shanghai closed lower

Wall Street had already suffered significant losses over the preceding two sessions. The Philadelphia Semiconductor Index (SOX) fell 10.3% on Friday alone, its worst single-session loss since early 2025, and the SOXX semiconductor ETF lost 10.4% . Across the chip sector, an estimated ~$1.3 trillion in market value evaporated .

Key individual losses included:

• Nvidia: roughly $300 billion in market cap erased
• Broadcom: down ~15%
• Arm Holdings: -12.8%
• Marvell: -17%
• Micron: approximately -13% cumulatively
• AMD: -6.3%

The Nasdaq fell ~4% and the S&P 500 shed ~2.6%.

The Tuesday snapback: V-shaped and violent

In one session, the Kospi regained almost everything it lost. It closed at 8,096.92, up 612 points or 8.18% — the seventh-largest point gain on record . The move was so rapid it triggered a buy-side sidecar in KOSPI 200 futures, the 11th such activation in 2026, as retail investors led a 471.3 billion won net-buying wave .

Several catalysts converged:

• Nvidia confirmed a multi-year AI memory deal with SK Hynix, directly countering the narrative that AI chip demand was softening .
• Nvidia CEO Jensen Huang publicly called the semiconductor sell-off a buying opportunity .
• An Iran-Israel ceasefire lowered the geopolitical risk premium that had been weighing on energy-sensitive Asian markets .
• Institutional dip-buying and short-covering in Samsung and SK Hynix drove Samsung up 3.4–9% and SK Hynix up 5.8–16%, depending on the intraday window .

Japan's Nikkei gained 1%, with Tokyo Electron rising 7.5–9.9% . Other Asian benchmarks were mixed but technology names led everywhere.

What the episode reveals about the current market

Fed path uncertainty is now the dominant macro risk. Before the jobs report, markets saw roughly 25% odds of an October rate hike. Afterward, that jumped to roughly 50–60% . Interest-rate swaps fully price in a hike by the December meeting . For tech and growth equities — still valued on a long-duration, low-rate assumption — this is a material headwind.

AI spending versus AI revenue is the sector's unresolved tension. Broadcom's revenue was a record and its guidance implied nearly 200% year-over-year AI chip growth . The market sold off anyway because the growth rate disappointed relative to expectations that had become detached from even bullish fundamentals. The question now is whether 2026 marks a peak in AI semiconductor growth rates — not a contraction, but a deceleration — and how much of the nearly $650 billion in hyperscaler AI spending will translate into sustained revenue. The answer is not yet clear.

Asian tech markets remain structurally fragile to U.S. rate and AI sentiment shifts. South Korea's Kospi had already fallen 15% from its June 2 peak by the Monday trough . That leverage and concentration risk means sharp reversals can occur in either direction within hours — as Tuesday proved.