
SK Hynix, South Korea's largest supplier of specialized memory chips for AI, plunged 15% on Monday, dragging the broader Kospi index down 9% and forcing a market-wide trading halt. The decline wiped roughly $125 billion(約20兆円) from the company's market value in a single session, reversing gains made just weeks after the company crossed $1 trillion(約160兆円) in valuation. The selloff appears driven by profit-taking and concerns that SK Hynix's operating profit may miss expectations due to slower price growth in high-bandwidth memory, the specialized chips essential for NVIDIA's AI processors.
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SK Hynix, a major supplier of high-bandwidth memory for NVIDIA's AI processors, fell 15% on Monday — its largest-ever single-day decline. The selloff pushed South Korea's Kospi index down 9% and triggered a market-wide trading suspension. Samsung Electronics also fell nearly 11%. Foreign investors sold 1.7 trillion won (approximately $1.1 billion(約1800億円)) of Kospi-listed shares, with SK Hynix accounting for most of the selling.
Why it matters
SK Hynix's market value dropped below $1 trillion(約160兆円), less than two months after entering that valuation tier. A Korea Investment & Securities report estimated the company's operating profit for the latest quarter could fall 8% below market expectations, partly because high-bandwidth memory pricing is rising more slowly than conventional memory products. Both SK Hynix and Samsung now trade at least 30% below record levels reached last month, signaling investor concern about the sustainability of AI-driven valuations.
What to watch
SK Hynix's U.S. American depositary receipts (which debuted Friday) fell approximately 9% in premarket trading. The company raised $26.5 billion(約4.2兆円) in its U.S. offering, with orders exceeding available shares by more than seven times. SK Hynix's CEO said memory-chip shortages would probably continue beyond 2030, though analysts expect elevated volatility through late July as foreign investors rebalance positions.
SK Hynix's 15% crash reflects a broader reassessment of AI-driven valuations in South Korea's equity market. The company's role as a critical supplier of high-bandwidth memory for NVIDIA's AI processors has made it central to the region's AI boom — the article notes SK Hynix shares are more than 500% higher over the past year as memory shortages and rising prices supported record earnings. However, the Monday selloff suggests investors are now questioning the durability of those gains, particularly as the company's exposure to high-bandwidth memory (where pricing pressure is more intense than in conventional memory) raises the risk of margin compression.
The timing reveals two conflicting signals. SK Hynix's $26.5 billion(約4.2兆円) U.S. offering, which attracted orders seven times over and generated a 13% pop in its American depositary receipts on debut, demonstrates persistent global appetite for the company. Yet the same week, the Korean-listed shares collapsed on concerns that operating profit may miss expectations — a disconnect that analysts attribute to profit-taking rather than fundamental deterioration. SK Hynix's CEO stated that memory-chip shortages would probably continue beyond 2030, a bullish signal on long-term demand. Nevertheless, investors are concerned that expanding production capacity could eventually pressure profitability if demand weakens, a risk underscored by the Korea Investment & Securities estimate of an 8% miss on operating profit. Looking ahead, analysts expect elevated volatility through late July as foreign investors rebalance positions and rotate into the U.S.-listed receipts, with some arguing the selloff may have created a buying opportunity after a year-long run-up.
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