Shares of SK Hynix plunged 16% in Seoul, marking the largest single-day decline in the company’s history just days after its blockbuster U.S. market debut. The selloff came despite the memory chip maker completing one of the most successful IPOs ever by a foreign company, highlighting how quickly investor sentiment can shift following a highly anticipated listing.
The sharp decline follows last Friday’s Nasdaq debut of SK Hynix’s American depositary shares (ADRs). The company raised $26.5 billion in the largest U.S. IPO ever by a foreign issuer, with investor demand reportedly exceeding $200 billion. The offering was more than seven times oversubscribed, and the ADRs opened approximately 15% above their IPO price on the first day of trading, reflecting enormous enthusiasm for companies tied to the artificial intelligence boom.
The latest selloff suggests many investors are now locking in profits after the stock’s strong debut. Newly listed companies often experience heightened volatility as early buyers, institutional investors, and short-term traders adjust their positions once trading begins. In SK Hynix’s case, expectations had already been exceptionally high following one of the most sought-after IPOs in recent years.
Despite the record decline, the company’s long-term fundamentals remain closely linked to the expanding AI infrastructure market. SK Hynix controls roughly 56.4% of the global high-bandwidth memory (HBM) market, supplying advanced memory chips used in NVIDIA’s AI accelerators and data center hardware. Demand for HBM continues to outpace supply as hyperscale cloud providers expand AI infrastructure worldwide.
The company also plans to use the proceeds from its U.S. listing to expand semiconductor production capacity and invest in additional EUV lithography equipment in South Korea. Those investments are intended to strengthen SK Hynix’s leadership in next-generation AI memory as competition intensifies across the semiconductor industry.
For investors, the correction serves as a reminder that even companies with strong long-term growth prospects can experience sharp short-term swings after major IPOs. The combination of record investor demand, a strong first trading session, and elevated expectations created conditions where many buyers entered at premium valuations before the subsequent pullback.
Attention will now turn to whether the decline represents temporary profit-taking or the beginning of a broader reassessment of AI semiconductor valuations. With demand for AI memory expected to remain strong, analysts will continue monitoring SK Hynix’s earnings, production expansion, and pricing trends in the months ahead.
