SK Hynix Seoul shares plunge record 15%+ after $26B Nasdaq debut amid profit-taking and AI demand concerns

SK Hynix stock fell more than 10% in Seoul on Monday, immediately after its heavily anticipated Nasdaq debut.

SK Hynix shares plunged more than 15% on the Seoul Stock Exchange on Monday in what was the chipmaker's biggest single-day decline on record. The selloff followed SK Hynix's blockbuster Nasdaq debut last week, through which the company raised more than $26 billion, and reflected a combination of profit-taking by Seoul investors who had ridden a strong pre-listing rally, and growing concerns about the sustainability of AI-driven demand for memory chips. Retail investor enthusiasm surrounding the stock had driven heavy use of leverage in the lead-up to the Nasdaq listing, according to Straits Times reporting. That dynamic tends to make a stock vulnerable to outsized swings once sentiment shifts, as leveraged positions can be forced to unwind quickly. Pre-market trading on Monday showed shares down about 10% before the Seoul session opened. Beyond profit-taking, Bloomberg and Reuters both noted that broader memory sector stocks also fell on questions about the long-term durability of artificial intelligence-related chip demand — a concern that extended beyond SK Hynix itself. Reuters characterized the move as 'memory chip euphoria cooling.' The company is one of the world's largest producers of memory chips, including the high-bandwidth memory (HBM) used in AI hardware, and its Nasdaq listing had been closely watched as a barometer of global investor appetite for semiconductor stocks tied to AI.

Why it matters

A 10% single-day drop in a major chipmaker is a significant market event, illustrating how a flashy U.S. listing can trigger volatility in a company's home market. It also highlights the risks retail investors face when leverage amplifies price swings around high-profile stock events.

What's next

Analysts and investors will be watching whether the Seoul share price stabilizes or continues to swing as leveraged positions are unwound in the days following the Nasdaq debut.

Key facts

• SK Hynix shares fell more than 10% on the Seoul Stock Exchange on Monday
• The decline followed the chipmaker's debut on the Nasdaq, described by both sources as stellar or blockbuster
• Heavy retail use of leverage ahead of the listing was cited as a key factor amplifying the volatility
• SK Hynix is a major producer of high-bandwidth memory chips used in AI hardware
• Both sources agree on the approximately 10% magnitude of the Seoul decline

Bias & framing notes

Both sources agree on the core fact of a roughly 10% decline in Seoul following the Nasdaq debut. Straits Times added context about retail leverage driving volatility, while CNBC's report was more brief, focusing on the price move itself without elaborating on the underlying mechanics. Neither source provided significantly differing facts, but the depth of explanation varied.

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