March 12, 2025, Seoul, South Korea — Asian financial markets experienced severe turbulence today, with the Korea Composite Stock Price Index (KOSPI) plunging 10.3% in a single day, marking the largest daily drop since the onset of the COVID-19 pandemic in March 2020. This event also represents the seventh time since its establishment in 1983 that the index has fallen by more than 8%. The crash resulted in a loss of approximately $350 billion in total market capitalization for the South Korean stock market, quickly spreading to neighboring markets and triggering a regional sell-off.
According to data from the Korea Exchange, the KOSPI closed at 2215.47 points, reflecting a staggering decline throughout the day. Dragged down by this, Japan's Nikkei 225 index fell 4.7%, Hong Kong's Hang Seng index dropped 5.2%, China's Shanghai Composite Index retreated 3.8%, and Australia's ASX 200 index also closed down 3.1%. Taiwan's Weighted Index plummeted 6.1%, Singapore's Straits Times Index slid 4.3%, while Thailand's SET and Indonesia's IDX Composite experienced relatively milder declines of around 3.5%, indicating a differentiated response from investors regarding the regional economic fundamentals.
Market analysts pointed out that this decline was triggered by multiple overlapping factors. Firstly, the global semiconductor demand outlook has once again darkened, hitting the technology sector, a pillar of the South Korean economy, the hardest. Secondly, the ambiguous monetary policy signals from major central banks have heightened market concerns about future liquidity. Additionally, escalating geopolitical tensions have prompted institutional investors to shift towards risk-averse strategies. Furthermore, algorithmic trading systems accelerated selling pressure during the downturn, creating a feedback loop that amplified market volatility.
It is noteworthy that this adjustment occurred after major Asian stock markets had reached ten-year highs in valuations. By the end of 2024, the price-to-earnings ratios of several regional stock markets were nearing historical peaks, while trading volumes continued to shrink and market breadth narrowed, indicating that systemic risks were accumulating. Historical data shows that the KOSPI has previously only experienced similar levels of daily declines during the 2008 financial crisis, the 2015 global stock market turmoil, and the outbreak of the pandemic in 2020. This incident once again highlights the high sensitivity of emerging markets to external shocks.