SK Hynix, which makes more specialized memory for AI systems than any other company, started trading on Nasdaq this week after raising $26.5 billion（約4.2兆円） in a record-breaking share sale. The listing removes barriers that prevented ordinary U.S. investors from owning the world's top HBM maker, but the company operates in a cyclical memory market where prices can swing sharply if supply overshoots demand.
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SK Hynix, the South Korean maker of high-bandwidth memory (HBM) — specialized memory stacked next to processors to speed data access in AI systems — began trading on Nasdaq this week after raising $26.5 billion（約4.2兆円） through a record-setting share sale priced at $149 per American depositary receipt. Orders ran to about seven times the shares available, and the stock was indicated to open roughly 17% higher.
Why it matters
SK Hynix controls more than half the HBM market and is a critical supplier to Nvidia. Until now, U.S. investors had to use thinly traded over-the-counter receipts or Asian funds to gain exposure; a liquid Nasdaq listing removes that friction and may support valuation (Taiwan Semiconductor Manufacturing, which lists in both places, trades at a premium in the U.S.). The listing is the largest first-time U.S. offering ever by a foreign company, surpassing Alibaba's 2014 debut.
What to watch
Memory is a cyclical business that swings between shortage and glut; memory stocks slid into a bear market days before the debut, and SK Hynix's Korea-listed shares have climbed several hundred percent over the past year, leaving little room for error. Competition from Samsung Electronics and Micron Technology is fierce, and a future oversupply could pressure prices quickly.
SK Hynix's entry to the Nasdaq marks a watershed moment for AI-focused investors: the world's dominant maker of high-bandwidth memory—the critical component that prevents AI accelerators from stalling as they wait for data—is now as accessible as any U.S. stock. The $26.5 billion（約4.2兆円） raise reflects extraordinary investor appetite; orders ran to roughly seven times the available shares, and the stock opened sharply higher. This is not merely a financial milestone but a structural shift in how American portfolios can gain exposure to a essential piece of AI infrastructure.
However, the listing arrives at a moment of tension in the memory market. Memory is inherently cyclical, oscillating between shortage and glut, and the timing is pointed: memory stocks had already slid into a bear market days before SK Hynix's debut, even as Samsung posted one of its best quarters ever. SK Hynix's Korea-listed shares have climbed several hundred percent over the past year, leaving limited cushion for setbacks. Competition from Samsung Electronics and Micron Technology remains fierce, and an oversupply could compress prices rapidly. The convenience of direct Nasdaq access is genuine, but it cuts both ways—U.S. investors now have an unfiltered line to both the upside of the AI memory boom and the volatility inherent to a cyclical industry.
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