South Korean Shares Surge 6% as Semiconductor Giants Lead Sharp Market Rebound

South Korean equities staged a dramatic turnaround on Thursday, August 20, 2026, with the benchmark KOSPI index surging over 6% to cross the 6,850 level. The rally completely erased the previous session’s steep 5.8% drop, driven by a massive rebound in major semiconductor heavyweights and buoyed by liquidity support from the U.S. Treasury.

The volatility triggered the Korea Exchange (KRX) to temporarily activate a buy-side “sidecar” trading curb to pause program buy orders for five minutes during early trade as institutional inflows poured into tech stocks.

Key Market Drivers

1. Massive Shareholder Return Announcements:

   • SK Hynix (+14.1%): The memory maker soared after detailing a landmark 40 trillion won ($28.6 billion) treasury share buyback and retirement plan, alongside committing over 50% of its free cash flow (2025–2027) to investor returns.

   • Samsung Electronics (+9.7%): Heavily boosted by reports that its board will approve a >100 trillion won ($72 billion) capital return program at the end of August, featuring special dividends and buybacks fueled by AI chip profits.

2. Easing Global Yield Pressures:

   • The U.S. Treasury Department’s announcement that it would double its planned buybacks of long-duration debt pulled sovereign bond yields lower across global markets, immediately reviving risk appetite for growth and high-beta AI equities.

KOSPI Heavyweight Performance Summary

Investor Outlook

The multi-billion-dollar buyback and dividend commitments by South Korea’s memory giants underscore the immense cash-generation capabilities of the ongoing AI hardware supercycle. Although geopolitical tensions in the Gulf and high U.S. interest rates remain key macro risks, aggressive capital returns from AI chip leaders have provided a strong floor for South Korean equity valuations.