SK Hynix After-Hours Block Deal: What Happened?

After the market closed on September 18, 2025, 169,916 shares of SK Hynix were traded for ₩59.8 billion in an after-hours block deal. This transaction is comparable in size to the trading volume of foreign investors, the largest investor group that day, and is expected to have a significant impact on the market.

Why the After-Hours Block Deal?

This large transaction is interpreted as reflecting the market’s confidence in SK Hynix’s strong fundamentals. The announcement of strong earnings in the first half of 2025 reaffirmed SK Hynix’s dominant position in the AI memory market, particularly in the HBM sector. This likely boosted investor confidence and facilitated a large inflow of funds.

Investment Strategy for SK Hynix

SK Hynix holds high growth potential as a key player in the AI era. Its robust fundamentals, HBM technology leadership, and stable financial structure enhance its long-term investment value. However, it’s crucial to consider risk factors such as global economic uncertainty and intensifying competition. Therefore, a prudent investment strategy requires continuous monitoring of AI market trends, macroeconomic indicators, and institutional investor activity.

Action Plan for Investors

  • Monitor AI Market and HBM Technology Trends: The growth of the AI market and advancements in HBM technology are key factors influencing SK Hynix’s future.
  • Watch Macroeconomic Indicators: Analyze the impact of changes in interest rates, exchange rates, and other macroeconomic factors on SK Hynix.
  • Track Institutional Investor Activity: Understanding institutional investor trading patterns can provide valuable insights into market sentiment and inform investment decisions.