South Korean stock market plunges over 10% in a single day, Middle East conflict triggers "circuit breaker" mechanism

The escalation of the Middle East conflict caused the Korean stock market to plummet on Wednesday, with the Korea Composite Stock Price Index (KOSPI) and the KOSDAQ both falling over 10% during Seoul morning trading, triggering a circuit breaker and marking the worst single-day performance since August 2024. Cryptocurrency researchers describe this as a “black swan event” and note that global stock market capitalization has evaporated by $3.2 trillion over the past four days.

Heavy dependence on oil is the fundamental reason for Korea’s deep impact

(Source: Google Finance)

Jim Bianco, CEO of Bianco Research, pointed out the core logic behind Korea’s intense reaction in this crisis: “Korea relies on 94% of its oil imports, with 75% coming from the Middle East. Therefore, it’s understandable why ‘oil-dependent’ Korea would panic.” Watanabe Securities’ chief strategist, Kazuaki Shimada, also analyzed that investors chose to sell off the previously outperforming Korea Composite Stock Price Index and the Nikkei Index to lock in profits.

On the same day, Japan’s Nikkei and TSE indices both fell nearly 4%; Hong Kong’s Hang Seng Index dropped 3%; China’s Shanghai Composite Index declined 1.3%. Thailand, another major importer of Middle Eastern oil, also saw its stock market fall 7.8% that day.

Oil surge and the Strait of Hormuz crisis

The core of the global market panic is the direct threat to worldwide oil supply posed by the Middle East conflict. According to OilPrice, since the U.S.-Israel airstrikes began on February 28, Brent crude has risen 14% to $82 per barrel, and WTI crude has increased 12% to $75. After Iran threatened to block the Strait of Hormuz, Trump stated on Truth Social, “If necessary, the U.S. Navy will begin escorting oil tankers through the Strait of Hormuz as soon as possible,” claiming the U.S. has “almost unlimited” weapons supplies and that the war could “go on forever.”

Cryptocurrency analyst Lee Seong-hoon said, “This is not just a war. It is the most serious geopolitical shock since 1973.” He also pointed out that Korea’s stock market trading halt was due to “the crash being too fast for the system to handle.”

Key data impacts of the Middle East crisis on global markets

• Korean stock market: KOSPI and KOSDAQ both plunged over 10%, triggering a circuit breaker, marking the largest single-day drop since August 2024.
• Other major Asian markets: Nikkei and TSE indices each fell nearly 4%; Thailand’s stock market dropped 7.8%; Hong Kong’s Hang Seng fell 3%; Shanghai Composite Index declined 1.3%.
• Oil market: Brent crude rose 14% since February 28 to $82 per barrel; WTI increased 12% to $75.
• Global market cap loss: Over the past four trading days, global stock market capitalization has evaporated about $3.2 trillion.
• Cryptocurrency market: Total market cap only decreased 0.5% to $2.39 trillion (according to CoinGecko), showing relative resilience.

Frequently Asked Questions

What is the circuit breaker mechanism, and what triggered it in Korea this time?

The circuit breaker is a protective measure that automatically pauses trading when stock prices fall rapidly, aiming to prevent panic selling from spiraling out of control. Korea’s circuit breaker was triggered when both KOSPI and KOSDAQ fell over 10% in a short period, reaching the thresholds set by the Korea Exchange. Cryptocurrency researchers describe this as due to “the crash being too fast for the system to respond.”

Why does the threat of the Strait of Hormuz blockade have such a profound impact on Korea?

The Strait of Hormuz is one of the world’s most critical oil transportation routes. Korea relies on imports for 94% of its oil, with 75% coming from the Middle East. If supply is disrupted, energy costs will soar, directly impacting Korea’s manufacturing sector and overall economy. This is the fundamental reason for Korea’s intense market reaction during this crisis.

Why has the cryptocurrency market been relatively resilient during this stock market crash?

According to CoinGecko, the total cryptocurrency market cap only declined 0.5% that day, showing relative stability compared to stocks. However, the crypto market has still fallen about 21% year-to-date. This slight fluctuation may reflect that the market has already priced in geopolitical risks early on, rather than cryptocurrencies being recognized as a safe haven asset.