SK Hynix Falls 3% to 1,216,000 Won as Kospi Reverses From 5,504 High

SK Hynix closed down 3.03% at 1,216,000 won on Friday, November 13, as South Korea's Kospi surrendered an intraday high of 5,504.44 and finished below 5,300.

The memory maker had gained more than 4% in early trading. It ended the session 38,000 won below Thursday's close of 1,254,000 won. Samsung Electronics also gave up its morning advance and closed down 0.96% at 206,000 won.

The Kospi finished at 5,290.53, down 52.20 points, or 0.98%. The index had opened at 5,452.41, up 2.05% from Thursday's close of 5,342.73, and buying in semiconductor heavyweights pushed it a further 52 points higher to 5,504.44. That put the morning advance near 3.03%.

The rally then unraveled. The benchmark crossed into negative territory around 12:35 p.m. local time and closed 213.91 points below its peak, a drop of roughly 3.89% from the high. The Kosdaq kept a fraction of its gains, finishing 0.45% higher at 699.66.

Why did semiconductor stocks reverse?

South Korean market reports linked the selling to uncertainty after Jensen Huang's departure as Nvidia chief executive and to concerns that the United States could tighten semiconductor export restrictions on China. Those explanations reflect reported market sentiment rather than an independently established cause of Friday's selling.

Foreign investors drove the reversal. Overseas buyers who supported the morning advance shifted toward net selling as the afternoon developed. Semiconductor stocks figured prominently in the decline, though losses were not uniform across the market. KB Financial Group rose 4.74% and Hyundai Motor gained 1.13%, showing the weakness was concentrated in heavyweight technology sectors.

Friday's session extended Thursday's 0.61% Kospi loss, when Samsung gained 0.97% and SK Hynix declined 1.80%. Friday brought both chip leaders into negative territory.

What does the Nvidia change mean for SK Hynix?

Huang resigned as chief executive on November 12. Chief Financial Officer Colette Kress assumed the role on an interim basis. Nvidia shares had fallen more than 14% intraday on Thursday before recovering to close down 4.34%. The Philadelphia Semiconductor Index declined 0.54%, providing a weaker overnight backdrop for Asian chipmakers.

For SK Hynix, the significance extends beyond Nvidia's share price. The Korean manufacturer is a major supplier of high-bandwidth memory, or HBM, used alongside advanced AI processors. Nvidia's product development plans, customer demand and procurement decisions therefore carry direct implications for SK Hynix's future revenue and capacity requirements.

South Korean financial reporting also tied Friday's selling to concerns that the controversy around Nvidia could accelerate tighter U.S. restrictions on semiconductor exports to China, partly because of Huang's previous advocacy for access to the Chinese market.

Expectations should not be confused with regulatory action. Friday's trading does not establish that Nvidia has cut memory purchases, that SK Hynix has lost orders, or that new U.S. export controls have taken effect. Restrictions on advanced processor sales to China and shifts in global HBM demand are related but separate risks. The financial impact on Korean suppliers would depend on the scope of any new restrictions and on how Nvidia and its customers respond.

Did the president's exchange visit help?

President Lee Jae-myung visited the Korea Exchange in Yeouido, Seoul, on Friday morning. Speaking at a meeting on capital-market development, he reaffirmed his administration's commitment to improving the structure and operation of South Korea's equity market as part of a broader effort to lift investor confidence and address longstanding concerns about Korean stock valuations.

The market turned lower anyway. The policy message failed to sustain the morning's buying, illustrating the competing forces on Korean equities: domestic reform may support valuations over time, while global technology sentiment, foreign portfolio flows and U.S. trade policy exert immediate pressure on the country's largest listed companies.

What comes next for investors?

SK Hynix's 3.03% decline was more than triple the Kospi's 0.98% loss, reflecting the stock's higher sensitivity to Nvidia and AI supply-chain concerns. The company remains exposed to strong structural demand for advanced memory, but the value investors assign to that demand rests on confidence in future orders, pricing and production requirements.

Watch Nvidia's forthcoming earnings report, statements from its interim leadership on product roadmaps and suppliers, and any changes to U.S. semiconductor export policy. Foreign investor flows also matter after Friday's reversal, since the Kospi's failure to hold 5,500 shows how quickly early buying can evaporate when large technology stocks meet selling pressure. For SK Hynix, the immediate question is whether Friday's drop reflects transient uncertainty around Nvidia's leadership or the start of a broader reassessment of AI infrastructure spending and memory demand; subsequent company guidance and customer orders will provide stronger evidence.