March 23, 2026 — South Korea’s benchmark KOSPI index plunged 6.49% on Monday, closing at 5,405.75, its lowest level in two weeks. The sell-off was triggered by a “double whammy” of escalating Middle East tensions and a crashing currency, marking the biggest daily percentage loss since the historic 12% drop on March 4.
The volatility was so extreme that the Korea Exchange (KRX) was forced to trigger a “sidecar” trading curb—temporarily halting program trading for five minutes—just 18 minutes into the session. This is the sixth such curb issued this year.
The “Trump Ultimatum” Trigger
The primary driver of the crash was geopolitical panic following U.S. President Donald Trump’s 48-hour ultimatum to Iran over the weekend.
- Energy Infrastructure Threat: Markets reacted to Trump’s threat to “obliterate” Iran’s power plants if the Strait of Hormuz is not reopened by Monday night.
- Iranian Retaliation: Tehran’s vow to respond by attacking U.S. and Israeli energy assets in the region raised fears of a “total regional industrial disruption.”
- Oil Dependency: South Korea relies on imports for 81% of its energy, with 70% of its crude passing through the Strait. Investors fear a $110+ oil scenario will gut the country’s manufacturing-heavy economy.
Market & Currency Meltdown
| Asset / Index | Closing Value (Mar 23) | Change (%) | Status |
| KOSPI | 5,405.75 | -6.49% | Lowest since March 9. |
| KOSDAQ | 1,096.89 | -5.56% | Tech-heavy index under pressure. |
| KRW/USD | 1,517.3 | +16.7 won | 17-year low (weakest since 2009). |
| Samsung Electronics | — | -6.57% | Major drag on the index. |
| SK Hynix | — | -7.35% | Hit by global tech sell-off. |
Government & Central Bank Response
In an emergency effort to stabilize the economy, the South Korean government has announced a ₹1.37 lakh crore (25 trillion won) supplementary budget.
- Extra Spending: The budget will support businesses and households hit by surging fuel and energy prices.
- Monetary Policy: The newly named Bank of Korea Governor, Shin Hyun-song, signaled a “balanced” approach, acknowledging the difficulty of managing high inflation and a weakening won during an active war.
Analyst Sentiment: Correction or Bear Market?
While the KOSPI has fallen roughly 20% from its February highs, some analysts remain cautiously optimistic about the long term. Goldman Sachs recently maintained its year-end KOSPI target of 7,000, noting that the current drop is an “overdue correction” following the 176% surge seen in 2025.
“The market’s patience has become weak,” said Huh Jae-hwan of Eugene Investment & Securities. “While the government’s extra budget is a positive, hopes for an early end to the war are fading.”
