Asian equity markets came under heavy pressure after geopolitical tensions in the Middle East escalated, triggering broad risk-off sentiment across the region. Over several sessions, South Korea, Taiwan, and Japan all posted steep declines, with retail investors facing rapid losses as leverage and panic selling amplified market moves.
South Korea hit hardest as leverage unwinds
South Korea saw some of the sharpest losses in the region. According to the source material, the KOSPI fell nearly 20% over two trading days, marking one of its worst short-term drops since the 2008 financial crisis. On March 4, losses briefly exceeded 8%, prompting the Korea Exchange to activate a circuit breaker and halt trading in both the KOSPI and KOSDAQ for 20 minutes. It was the first simultaneous halt in both markets since August 5, 2024.
The decline was worsened by a buildup in margin financing during the previous rally. Data from the Korea Financial Investment Association showed that as of early March, outstanding margin balances had climbed to 32.67 trillion won, or about $22.3 billion, a record high. Many investors reportedly entered semiconductor trades with only 30% to 40% collateral. Once prices turned lower, forced deleveraging accelerated the sell-off. Adding to the stress, some Korean brokerages suspended margin lending during trading hours, limiting investors’ ability to meet margin calls. The won also fell below 1,500 per U.S. dollar on the same day, its weakest level since 2009.
Taiwan slides as TSMC drags the benchmark lower
Taiwan’s market also suffered a sharp setback. During the holiday period, offshore Taiex futures had already dropped as much as 700 points, signaling mounting pressure before the local cash market reopened. By March 4, selling intensified, and the Taiex at one point fell more than 1,373 points intraday, ranking among the largest intraday point losses in the market’s history.
TSMC was the main drag on the benchmark. Its share price dropped more than 70 Taiwan dollars and fell below the 1,900 level. The stock alone accounted for more than 600 points of downside in the broader index. Based on the figures cited in the report, TSMC lost nearly NT$2 trillion in market value in a single day, leaving its capitalization at roughly NT$27.5 trillion. At the same time, Taiwan’s margin balance had already risen to NT$346.6 billion, a 17-and-a-half-year high, suggesting that many retail investors had increased exposure with borrowed money near the top.
Japan’s NISA investors face their first real stress test
In Japan, the sell-off highlighted the vulnerability of newer retail investors who entered the market through tax-advantaged programs such as NISA and iDeCo. These schemes have drawn large numbers of young savers and retirement-focused investors over the past two years, but many joined during elevated market conditions and had not yet experienced a severe drawdown.
From March 2 onward, the Nikkei 225 fell for three straight sessions. On March 4 alone, it dropped more than 2,033 points, or 3.06%, while the cumulative three-day decline briefly exceeded 4,000 points. Major names were broadly lower, with Toyota down 6.1%, Sony down 6.3%, and Mitsubishi Heavy Industries down 5.3%. Semiconductor shares were hit even harder. Meanwhile, the Nikkei VIX rose to its highest level since August 2024, underscoring the sharp rise in market anxiety.
What markets are watching next
By the close on March 4, authorities in South Korea had already moved to coordinate emergency responses, while Taiwan’s market remained caught between foreign selling and weak retail support. In Japan, analysts focused on the risk that unstable oil prices could keep pressure on equities. Across all three markets, this episode exposed common fault lines: heavy reliance on leverage, concentrated bets on major technology names, and limited downside experience among newer investors.
Unless geopolitical risks ease and energy prices stabilize, volatility in Asian markets may remain elevated in the near term. For retail traders caught in the downturn, the damage goes beyond falling portfolio values—it also reshapes how risk is understood in real time.