South Korean chip giant SK Hynix saw its stock price surge by as much as 11% on Wednesday, pushing its market capitalization past the $1 trillion mark while market sentiment continued to heat up amid sustained enthusiasm for semiconductor sectors tied to artificial intelligence. Since the beginning of this year, SK Hynix has gained approximately 250%, driven primarily by explosive growth in demand for high-bandwidth memory (HBM) chips used in global AI servers and accelerators. Leveraging its leading position in the HBM market, SK Hynix has become NVIDIA's core supplier and firmly occupies a critical node within the global AI supply chain. Ultimately, SK Hynix closed with a gain of 9.21%, while Samsung Electronics rose by 2.68% during the same period. With both major South Korean chip giants surpassing the $1 trillion valuation threshold, they now collectively account for over 40% of the weight in Korea's KOSPI index, which has nearly doubled since the start of this year. This heavy concentration also raises concerns. Analysts warn that benchmark indices rely too heavily on AI semiconductor demand; if global data center investment slows down or disruptions occur in the supply chain, volatility risks could amplify significantly. However, KB Financial Group Global Investment Strategist Peter Kim remains optimistic. He noted that upward revisions to earnings forecasts have even outpaced gains in share prices, making valuations for SK Hynix and Samsung appear "cheaper." "The fundamentals and valuations of these two industry leaders remain very robust," said Kim.