South Korea’s Kospi Tumbles 5% on AI Chip Fears, Reversing Friday’s Record Rally

South Korea’s Kospi index closed 5% lower on August 3, wiping out most of Friday’s record 17.9% gain as semiconductor heavyweights Samsung Electronics and SK Hynix both fell 9%. The sharp reversal exposed the risks of leveraged trading in South Korea’s market, where retail investors using borrowed money faced forced sales during the selloff. Investors remain caught between strong US tech earnings and growing doubts that AI capex will translate into near-term profits.

How leverage turned Friday’s rally into Monday’s crash

Friday’s historic 17.9% Kospi surge triggered a wave of margin calls on Monday. Retail investors who had borrowed heavily to buy stocks were forced to sell into a falling market, amplifying losses. South Korean regulators have already suspended new listings of single-stock leveraged ETFs, banned financial firms from advertising them, and raised minimum cash deposit requirements to curb speculation. The same trap caught institutional investors: AI hedge fund Situational Awareness lost 67% in July and was forced to sell most of its public equities portfolio to Ken Griffin’s Citadel due to margin calls.

Samsung and SK Hynix lead the semiconductor rout

Samsung Electronics and SK Hynix each dropped 9% on August 3, dragging down the broader Kospi. Both companies are memory chip makers exposed to the AI spending debate. On August 4, however, SK Hynix announced a partnership with SanDisk to release the first standard specification for High Bandwidth Flash (HBF), a next-generation memory technology for AI servers. The announcement helped SK Hynix recover 1.98% and Samsung gain 1.04% in early August 4 trading.

July’s brutal decline set the stage for volatility

The Kospi suffered a 22% monthly loss in July, its steepest decline since the global financial crisis. That brutal stretch left the index roughly a third below its June peak. Leverage amplified both the damage and the recovery, creating extreme swings. Charu Chanana, chief investment strategist at Saxo, noted that leverage increases the risk of forced selling during market stress, a dynamic now playing out across South Korea’s retail and institutional investor base.

Global tech earnings offer mixed signals

US tech stocks rallied strongly in early August on blockbuster earnings from Microsoft, Alphabet, and Amazon. However, investor sentiment remains fragile. Palantir Technologies surged 14% after raising forecasts, while Apple fell 7.4% on August 2, its largest single-day market-cap loss on record at roughly USD 358 billion. Oil prices fell 4.73% to USD 83.77 per barrel after President Trump canceled planned strikes on Iran and confirmed talks would resume, easing inflation concerns but also raising questions about whether AI spending will justify the capex boom.

Final Thoughts

The Kospi’s wild swings reflect a dangerous mix: leveraged retail positions, concentrated institutional bets on AI, and genuine uncertainty about returns on massive chip spending. For Singapore investors tracking regional tech exposure, the data points to continued volatility until earnings clarity emerges.

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The content shared by Meyka AI PTY LTD is solely for research and informational purposes.  Meyka is not a financial advisory service, and the information provided should not be considered investment or trading advice.