1. What Happened?: Analyzing the SK Hynix After-Hours Block Trade

On September 16, 2025, a substantial 125,703 shares of SK Hynix were traded for ₩43.8 billion during after-hours trading. Notably, foreign investors simultaneously recorded ₩1.2 trillion in net buying and ₩960 billion in net selling, focusing market attention. This large-scale trading suggests the potential for increased stock volatility in the future, necessitating a cautious approach from investors.

2. Why?: Analyzing SK Hynix Fundamentals – The Biggest Winner in the AI Era

SK Hynix achieved record-breaking earnings in the first half of 2025, driven by the growth of the AI market and surging demand for HBM. Its technological leadership in the AI memory market and solid financial structure are positive investment points. However, the volatility of the semiconductor industry, geopolitical risks, and intensifying competition are risk factors to consider when investing.

3. So What?: SK Hynix Future Outlook – Will Positive Momentum Continue?

While the after-hours block trade may cause short-term stock volatility, SK Hynix’s strong fundamentals and the growth of the AI market suggest a high probability of long-term growth. The active trading by foreign investors could be a crucial signal for future stock movements and warrants further analysis.

4. Investor Action Plan

Investors considering investing in SK Hynix should pay attention to the following:

  • • Monitor AI market and HBM technology trends
  • • Analyze competitor activity and market share changes
  • • Check macroeconomic indicators and exchange rate volatility
  • • Maintain a diversified portfolio and a long-term perspective