Briefing
- The global AI chip sell-off that hammered South Korean equities reversed sharply, with the Kospi surging between 15% and 18% in a record single-day rally on renewed AI trade optimism.
- The rebound followed two days of severe losses: the Kospi had slid as much as 12.6% on Wednesday after disappointing SK Hynix results, and had already closed nearly 11% lower on Tuesday when trading was halted for 20 minutes after the index fell 8%.
- Samsung Electronics and SK Hynix each declined more than 13% on Tuesday; Japan's Nikkei 225 closed almost 4% lower on the same day.
- Nvidia fell 5% in New York on Monday after the Wall Street Journal reported it is in talks to provide around $250bn for an OpenAI data-centre project, ceding its position as the world's most valuable listed company to Apple.
- Investor concerns centred on the scale of borrowing among AI companies to fund data-centre expansion and the growing threat of Chinese chip competition.
- Jane Sydenham of Rathbones said Korean investors' heavy use of debt financing 'exaggerates the movements when we get a correction like this.'
Analysis
- SK Hynix and Samsung face a structural de-rating that extends beyond the immediate sell-off: the 13%+ single-day declines occur simultaneously with CXMT's 471% IPO debut, which signals Chinese domestic capital is rotating toward a local memory champion at scale. If CXMT narrows the HBM gap with SK Hynix, the Korean firm's premium valuation on AI memory demand loses its defensibility, particularly as its US-listed shares already trade below the $149 IPO offer price.
- The Kospi rout amplifies emerging market contagion risk beyond Korea: leveraged retail positioning, flagged by Jane Sydenham of Rathbones, accelerates forced selling across Korean equities broadly, not just chip names. The Bank Indonesia governor resignation story compounds the EM stress signal; foreign investors already reassessing Asian risk exposure now face two simultaneous governance and market-structure concerns in the same region within 48 hours.
- Nvidia's $250bn OpenAI data-centre commitment, combined with its near-$4bn Nebius stake and contributions to OpenAI and Anthropic funding rounds, shifts the market's concern from GPU demand to capital allocation discipline. A 5% single-session decline on news of a $250bn spend, not a revenue miss, suggests investors are beginning to price Nvidia as a capital-heavy infrastructure investor rather than a pure-play chip vendor, which compresses the multiple.
Historical Context
- Jan 2025
DeepSeek's low-cost AI model release caused Nvidia to lose approximately $600bn in market cap in a single session, the largest single-day loss for any company in US market history, as investors questioned whether high-end GPU spend was sustainable. The current sell-off mirrors that ROI-on-AI-spending doubt cycle.
- Aug 2024
The Kospi fell roughly 8% in a single session during the global carry-trade unwind triggered by the Bank of Japan's rate hike, with leveraged Korean retail investors again cited as an amplifying factor. That episode resolved within days once yen volatility subsided, but the structural leverage dynamic flagged then is the same one Rathbones highlighted in this sell-off.
- 2008
Korean equity markets fell over 40% during the global financial crisis partly due to heavy retail use of margin financing, the same structural vulnerability Jane Sydenham of Rathbones identified as exaggerating the current correction. Circuit-breaker halts, triggered then and again in this session, have historically failed to prevent full liquidation cascades when leverage unwinds.
Connected Events
CXMT surges 471% on market debut in China's largest IPO since 2010
CXMT's 471% IPO debut on the same day as the Kospi rout creates a direct capital and narrative displacement: Chinese domestic investors are concentrating conviction in a local memory champion at an $85bn market cap while Korean memory incumbents face forced selling. The two events are mechanically linked through the AI memory competitive thesis.
Bank Indonesia Governor Perry Warjiyo resigns early in surprise move
Bank Indonesia governor Perry Warjiyo's unannounced resignation compounds the regional EM Asia stress signal from the Kospi collapse, giving foreign investors with broad Asian exposure two simultaneous governance and market-structure concerns within 48 hours.
Nvidia discloses 9.3% stake in neocloud Nebius, worth nearly $4bn
Nvidia's disclosed $250bn OpenAI data-centre commitment follows its nearly $4bn Nebius stake and participation in multiple multi-billion dollar AI funding rounds, reinforcing the capital allocation concern now visible in its 5% single-session decline.
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