SK Hynix and Samsung Shares Skyrocket as Kospi Hits Historic High
A massive rally in semiconductor stocks pushed South Korea's benchmark index to a record close on July 31, 2026.
South Korean semiconductor leaders SK Hynix and Samsung Electronics saw their shares skyrocket on Friday, July 31, 2026, reversing a period of intense volatility. The surge drove the benchmark Kospi index to a historic close, rising nearly 18% in a single session.
SK Hynix shares hit the daily limit in Seoul, rallying 30%. Samsung Electronics also saw significant gains, with Bloomberg reporting a climb of 27%. This massive rebound followed a sharp, multi-day rout in the global chip sector that had previously eroded investor confidence. The rally was further bolstered by a direct purchase of 3,620 SK Hynix shares by SK Group Chairman Chey Tae-won on Thursday, July 30.
The Road to Recovery
This spike follows a turbulent month for both companies. Despite reporting record profits and revenue, the two giants suffered a steep decline in stock value. This "chip stock rout" was fueled by mounting fears over the sustainability of AI capital expenditures and escalating geopolitical risks, creating a high-volatility environment for South Korean equities.
Global AI Implications
The scale of the rebound highlights the extreme sensitivity of the South Korean economy to the global AI trade. As critical suppliers of high-bandwidth memory (HBM) used in AI chips, SK Hynix and Samsung serve as primary indicators for the health of the global AI infrastructure build-out. When U.S. technology stocks rally, these firms often act as a proxy for the perceived demand for AI hardware.
Market Outlook
Investors are now watching to see if this surge marks a permanent floor for the sector or another swing in a volatile cycle. While the record-breaking Kospi jump signals a return of confidence, the market remains attuned to the actual spending patterns of AI developers and the stability of the international trade environment. The sudden shift underscores how quickly sentiment can pivot in the high-stakes race for AI dominance, leaving analysts to determine if the fundamentals have truly shifted or if the market is simply overcorrecting after the recent rout.