The Korean Stock Market Crashes Overnight. Will it Be Another Brutal Nasdaq Sell-Off on Tuesday?

South Korea's KOSPI just suffered a historic overnight collapse, dragging Samsung and SK Hynix down double digits and sending shockwaves straight into US chip stocks before Tuesday's open. Whether this sparks another brutal Nasdaq sell-off depends on one critical signal…

Published July 28, 2026, 7:12am ET · 2 min read

A dark, blue-tinged screen displays a stock market interface with numerous numbers, charts, and trading indicators. A prominent red line graph, appearing to be on fire, sharply declines from the upper left to the lower right, ending in a red downward-pointing arrow. Green and red bar charts are visible in the background, along with various financial data points showing percentages, numerical values, and labels like 'Sell', 'Strong Sell', and 'Buy'.
A fiery red line graph illustrates a dramatic stock market decline, reflecting the widespread risk-off selling impacting drone stocks like Ondas this Tuesday. © Travis Wolfe / Shutterstock.com

South Korea’s KOSPI just handed global chip investors a jolt. The index closed down 10.84% overnight, with memory names leading the wreck: Samsung fell 13.39% and SK Hynix fell 14.65%. The massive drop in the Kospi is reverberating across the globe. Investors are fleeing to safety with DOW Futures up .21%. However, as of 6:30 a.m. ET, Nasdaq futures are down 0.84%, while chip stocks are dropping far harder in premarket.

Micron Leads Pre-Market Declines

Micron Technology (NASDAQ:MU | MU Price Prediction) is down 5.4%, and the VanEck Semiconductor ETF (NASDAQ:SMH) is down 2.9%. This lands after yesterday was another in a long series of sell-offs across momentum and chips stocks. The iShares MSCI USA Momentum Factor ETF (CBOE: MTUM), which tracks momentum stocks, was down 1.33% yesterday and is down 1.93% pre-market. The ETF is down nearly 14% from recent highs in pre-market trading.

Micron shares are already down 20.49% over the past month, yet fundamentals remain a different story: fiscal Q3 revenue of $41.46 billion and Q4 guidance of $50.0 billion ± $1.0 billion. SMH holds MU at 9.39%, so memory pressure hits the ETF directly. The VIX at 18.58 signals no broad panic yet, suggesting this is sector-specific, for now.

KOSPI Now Down 34% From Recent Highs

The KOSPI closed at 9,114.55 on June 22nd. At today’s close, it’s now at 6,023.66. That’s a 34% drop in a little more than a month. Despite this massive drop, the index is up 43% year-to-date. The Nasdaq opened in positive territory yesterday, but dropped after reports NVIDIA (Nasdaq: NVDA) was preparing up to $750 billion in new financing and partnerships with OpenAI and SK Hynix.

What to Watch Today

The KOSPI unwind has clearly spread across technology and momentum stocks. After a furious rally in April and May, valuations became stretched on many popular names. Korean investors became deeply concentrated in leveraged products that make the unwind even more painful. Watch to see whether ETFs like SMH and MTUM continue to severely underperform the index. If they’re both deep red and the Dow is in positive territory when markets open, we’re seeing the continuation of a broad rally out of risk assets.

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Eric Bleeker

Eric Bleeker has been investing for more than 20 years. He began his career working at Microsoft before joining Motley Fool, one of the largest publishers of financial research. In his 15 years at Motley Fool Eric served as the General Manager for Fool.com and led coverage in the Technology & Telecom sector. In addition, he was a featured columnist and has hosted dozens of investing seminars attended by more than a million total investors. Eric has more than 1,000 financial bylines to his name and has been featured in The Wall Street Journal, CNBC, Fox Business, and many other leading publications. He is currently focused on artificial intelligence investing and is a CFA Charterholoder.

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