# South Korea's KOSPI triggers circuit breakers for a second straight day as the AI semiconductor rally collapses 40% below June peak > South Korea's KOSPI index triggered a market-wide circuit breaker on July 29, 2026, for the second consecutive day, a stock-market historic first; Samsung Electronics fell more than 5%, SK Hynix dropped 15.81%, Kioxia plunged 14%; the index has shed roughly 40% from its June 19 peak of 9,385, reversing most of a 116%-year-to-date AI-driven rally; South Korea's government called an emergency financial meeting; three simultaneous shocks drove the rout: China's US$8.6B CXMT memory-chip IPO, South Korea's own domestic DUV lithography announcement, and Nvidia's US$250B OpenAI financing deal **Meta:** type: event · date: 2026-07-29 · heads: 谁的钱, 什么崩了 · 9 takes · 5 lenses · 4 regions ## Summary South Korea's KOSPI and KOSDAQ both triggered market-wide circuit breakers on July 29, 2026, for the second consecutive session, a first in the exchange's history. The KOSPI fell 10.82% on the day and has now shed roughly 40% from its June 19 peak of 9,385, where it stood 116% year-to-date after a sustained rally driven by AI chip demand. [Samsung Electronics](/zh/entity/corporate/samsung) lost the 200,000 won level, falling more than 5%; [SK Hynix](/zh/entity/corporate/sk-hynix) collapsed 15.81%. Three simultaneous shocks are cited: China's US$8.6B CXMT memory-chip IPO (a direct competitive threat), [South Korea](/zh/entity/south-korea)'s own announcement of domestic DUV lithography production (undercutting the scarcity story), and Nvidia's US$250B OpenAI financing deal (signalling a shift away from Korean memory toward US compute infrastructure). The government called an emergency financial meeting. Margin calls accelerated the panic selling. ## The split South Korean domestic outlets (Seoul Economic Daily, Korea Economic Daily) focused on the structural reckoning in the AI-memory trade and the unprecedented circuit-breaker sequence. Al Jazeera placed it inside a broader narrative of the AI-driven boom fading. TradingKey's cross-market desk noted Japan's sympathy selling. Bloomberg (behind a paywall) reported that the record rout "failed to tempt global investors," suggesting foreign funds are not yet buying the dip. ## By the numbers - 10.82%, KOSPI single-day decline on July 29 - 40%, KOSPI fall from June 19 peak of 9,385 - 116%, KOSPI's year-to-date gain at the June peak - 15.81%, SK Hynix decline on July 29 - US$8.6B, China's CXMT memory-chip IPO size (competitive shock) - 6, people hospitalised in unrelated event (see Ukraine); 2, consecutive circuit-breaker days (first in South Korea's exchange history) ## Why it matters [South Korea](/zh/entity/south-korea)'s semiconductor exporters, chiefly [Samsung](/zh/entity/corporate/samsung) and [SK Hynix](/zh/entity/corporate/sk-hynix), are the marginal suppliers of HBM and DRAM to the global AI build-out. A 40% KOSPI crash reflects a rapid repricing of the AI-memory thesis: cheaper Chinese supply, a domestic production boost, and a shift in Nvidia's financing priorities are hitting simultaneously. The spillover to Japan's chip stocks (Kioxia, SoftBank) shows the repricing is spreading. ## What to watch - Whether the South Korean government's emergency financial meeting produces direct market support measures - SK Hynix's full Q2 earnings release and whether the consensus miss widens - CXMT's IPO timeline and its first disclosed production volumes - A third consecutive circuit-breaker session would signal full panic, not orderly correction ## Regional takes (batched by bias / lens) ### Korean domestic financial media - **Seoul Economic Daily (English)** (South Korea, en) — South Korea's closest domestic financial daily reporting: KOSPI and KOSDAQ triggered circuit breakers for the second straight day; the KOSPI fell 10.82%, Samsung Electronics lost the 200,000 won level, and SK Hynix fell 15.81%. The Seoul Economic Daily framed this as a structural failure of the AI-chip trade. > "KOSPI and KOSDAQ triggered circuit breakers for a second straight day on the 29th, with the KOSPI down 10.82%. Samsung Electronics lost the 200,000 won level and SK Hynix fell 15.81%." Source: https://en.sedaily.com/finance/2026/07/29/korean-stocks-plunge-kospi-kosdaq-trigger-circuit-breakers ### Korean institutional market reporting - **KED Global (Korea Economic Daily)** (South Korea, en) — Korea Economic Daily's institutional desk: a leverage-driven panic in which margin calls accelerated the selloff; the paper characterised it as 'stock bloodbath' and noted the unprecedented nature of a second consecutive circuit breaker across the exchange. > "South Korea's equity market spiraled further into crisis on Wednesday as a panic, leverage-fueled selloff triggered an unprecedented second consecutive circuit breaker." Source: https://www.kedglobal.com/korean-stock-market/newsView/ked202607290011 ### cross-market analysis, Asia spillover - **TradingKey** (Global, en) — Comparative Asia-Pacific analysis: South Korea was the hardest-hit market in the region, with Samsung Electronics off more than 5%, SK Hynix down nearly 10%, Kioxia down nearly 14%, and SoftBank off 7%, as Japan extended its own decline in sympathy. > "South Korean market once again becoming the hardest-hit area in Asian equities. Samsung Electronics fell over 5%, SK Hynix dropped nearly 10%, Kioxia plummeted nearly 14%, and SoftBank fell nearly 7%." Source: https://www.tradingkey.com/analysis/stocks/more/262060660-south-korea-stocks-kospi-sk-hynix-kioxia-tumble-tradingkey ### international financial press, AI-narrative framing - **Al Jazeera** (Qatar, en) — Al Jazeera framed the rout as the fading of the AI-driven boom in South Korean chipmakers, characterising the KOSPI's steep decline as interest in chipmakers falling broadly, not just one earnings miss. > "The benchmark KOSPI .KS11 sees steep decline as interest in chipmakers falls." Source: https://www.aljazeera.com/economy/2026/7/29/south-koreas-stock-market-plunges-as-ai-driven-boom-fades ### unlabelled - **Crypto Briefing** (Global, en) — Source: https://cryptobriefing.com/south-korea-emergency-meeting-kospi-crash/ - **Crypto Briefing** (Global, en) — Source: https://cryptobriefing.com/south-korea-kospi-35-percent-drop-july/ - **TechTimes** (United States, en) — Source: https://www.techtimes.com/articles/321968/20260729/kospi-triggers-historic-back-back-circuit-breakers-ai-memory-rally-faces-structural-reckoning.htm - **ECIKS** (Global, en) — Source: https://eciks.org/16955-kospi-stock-market-crash-july - **Bloomberg** (United States, en) — Source: https://www.bloomberg.com/news/articles/2026-07-30/korean-stocks-record-rout-fails-to-tempt-global-investors ## Across the graph - Related: [[sk-hynix-kospi-drop-jul13]], [[ai-semiconductor-selloff-jun23]], [[sk-hynix-dossier]], [[samsung-dossier]] - Entities: South Korea, Corporate:sk Hynix, Corporate:samsung --- Canonical: https://rbtfl.xyz/zh/n/korea-kospi-crash-0729