SK Hynix Slides 10% in Seoul as Nasdaq Debut Creates 20% Valuation Gap

Q: Why did SK Hynix stock plunge in Korea right after its record-breaking US debut?

SK Hynix fell in Seoul mainly because investors used the Nasdaq debut as a chance to rotate and sell the Korea-listed shares, while a broader semiconductor selloff was already hitting the market. The ADR launch was a huge capital event. SK Hynix issued 17.79 million new shares for the US listing, raising about $26.5 billion. That created dilution concerns and encouraged arbitrage: investors could buy the new US ADRs and sell the Korean stock, especially after the ADRs jumped 13% on debut. Market commentary around the listing also pointed to this trade, which added pressure to the Seoul shares. The drop was amplified by weak sector sentiment. Korean chip stocks had already been under pressure after Broadcom’s disappointing AI-chip revenue outlook triggered a pullback across the AI semiconductor complex. SK Hynix, as a major HBM supplier tied closely to the AI trade, was especially exposed to that shift in sentiment. Foreign selling in Korea also mattered. Overseas investors were dumping Kospi shares, with roughly $801 million sold by Monday morning. Analysts at Nomura and Goldman Sachs said some of that was “forced selling” tied to benchmark rebalancing and portfolio limits after Korea’s rally, rather than a sudden deterioration in SK Hynix’s business. So the plunge was less a verdict against the US debut itself than the result of dilution and arbitrage from the ADR sale, combined with a broader AI-chip correction and heavy foreign outflows from the Korean market.

3 articles · Updated · CNBC · Jul 13

SK Hynix fell more than 10% in Seoul on Monday after its ADRs jumped 13% in their Nasdaq debut Friday, extending an earlier 8.4% drop and dragging on domestic sentiment.
A more than 20% gap between SK Hynix's U.S. and Korean listings left investors reassessing fair value, while the ADR sale also increased share supply and encouraged profit-taking.
Analysts said the selloff reflected confusion over how long AI-memory demand can outpace incoming supply and what valuation multiple the chipmaker should command.
Strategists at Yuanta and Rayliant described the weakness as a correction and portfolio rebalancing rather than a break in the AI hardware story, with structural demand still seen supporting shares over 6 to 12 months.