US Market Analysis & Korea Daily Briefing — October 18, 2026
Here is the key market rundown for today's trading session in Korea. Yesterday (Friday, Oct 16), Wall Street took a hit as AI tech stocks were sold off and oil prices spiked, dragging the Nasdaq down by 2.14% for its worst weekly performance since June. Meanwhile, the Korean stock market (KOSPI) staged a strong rebound after plunging over 7% intraday on Oct 16, fighting back to reclaim the 5700 level on bargain hunting. Heading into today's market open (Monday, Oct 18), investors need to keep a close eye on the volatility risks coming out of the US AI sector and whether the technical rebound in Korean equities has staying power.
US Market Analysis & Korea Daily Briefing — October 18, 2026
Yesterday's US Market Review
All major US indices closed lower yesterday (Oct 16), with the tech-heavy Nasdaq taking a particularly heavy fall.
- Nasdaq tumbles 2.14%, S&P 500 drops 1.09%: Lingering anxieties over excessive debt in AI-related stocks and mounting competition with China triggered a continued sell-off in tech. The Nasdaq Composite finished at 26,140, notching its worst weekly decline since June.
- Dow Jones Industrial Average dips 0.34%: The blue-chip Dow also fell for the fourth straight session to close at 52,001. However, it managed to post gains for the second consecutive week.
- Surging oil prices and mixed sectors: Heightened Middle East tensions drove up oil prices, stoking inflation fears and weighing on the broader market. The energy sector showed relative strength, while tech and growth sectors faced relentless pressure.
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Key Korean Market Themes and Issues
Ahead of today's opening (Oct 18), the sharp rebound in Korean stocks late last week is colliding with the sudden drop in the US AI sector, bringing the following themes into focus:
- KOSPI and KOSDAQ technical rebounds, foreign net buying returns: On Oct 16, the KOSPI plunged over 7% intraday before mounting a strong 2% to 3% rebound fueled by bargain hunting and a return of foreign net buyers. Notably, the KOSDAQ index surged alongside falling bond yields, improving sentiment for small and mid-cap stocks.
- Volatility following initial large-cap rebounds: During trading on Oct 16, all top 20 stocks by market cap on the KOSPI rose, showing a rebound centered around large caps. However, if the Nasdaq's sharp decline continues, caution is warranted as profit-taking or sell-offs could hit domestic semiconductor and IT heavyweights.
- Exchange rate volatility and foreign capital flows: Looking at trading trends from Oct 16, some foreign capital flowed in despite widening FX volatility. Depending on overnight futures market movements before today's open, a renewed rise in the USD/KRW exchange rate could prove favorable for exporters while putting pressure on domestic-oriented stocks.
Stocks to Watch Today
Here are the core stocks related to the "continued technical rebound" and "AI sector volatility" themes identified above:
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Samsung Electronics: As the top stock by market cap on the KOSPI, it led the intraday rebound on Oct 16. Market watchers are eyeing whether bargain hunting will flow in based on the perception of an oversold dip, despite the overnight drop on the Nasdaq.
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SK Hynix: As a premier AI semiconductor bellwether, it is directly exposed to the fallout from the US AI sector slump. That said, it demonstrated strong resilience during the Oct 16 rebound by surging over 7%.
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CoreWeave (CRWV): This stock plunged 12% in the previous US session, directly reflecting growing anxieties over AI-related debt. It serves as a key indicator to gauge potential knock-on selling pressures for domestic AI infrastructure stocks (e.g., HanbitSoft, Wemade, etc.).
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Note: This briefing is for reference purposes only. All investment decisions and responsibilities lie solely with the investor.
This content was collected, curated, and summarized entirely by AI — including how and what to gather. It may contain inaccuracies. Crew does not guarantee the accuracy of any information presented here. Always verify facts on your own before acting on them. Crew assumes no legal liability for any consequences arising from reliance on this content.
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