Indonesia’s financial markets have experienced sustained volatility over the past four weeks as the Iran war triggered a global energy shock, capital outflows, and currency pressure. The impact has been immediate and multi-layered, affecting equities, the rupiah, fiscal policy, and investor sentiment across Southeast Asia’s largest economy.
Initial shock driven by oil and geopolitics
The conflict, which escalated in late February, immediately disrupted global energy markets. The closure and instability around the Strait of Hormuz — a key artery for global oil supply — led to a sharp rise in crude prices, creating inflationary pressure worldwide.
Indonesia, as a net oil importer, was particularly exposed. The Jakarta Composite Index (JCI) dropped sharply in early March, falling over 2.6% in a single session as investors reacted to rising fuel costs and geopolitical uncertainty.
The spike in oil prices also raised concerns about Indonesia’s fiscal balance, particularly the cost of fuel subsidies, which remain politically sensitive.
Currency weakness and capital outflows
As global risk sentiment deteriorated, foreign investors began pulling capital from emerging markets, including Indonesia. This contributed to a weakening rupiah, which fell close to IDR17,000 per US dollar during the period.
The currency pressure reflected a broader “risk-off” environment, where investors shifted toward safer assets amid geopolitical uncertainty. Indonesian bank stocks and other large-cap equities were particularly affected by foreign outflows, amplifying market volatility.
At the same time, trading volumes declined, indicating reduced market participation and heightened caution among institutional investors.
Policy response and fiscal adjustments
The Indonesian government moved quickly to mitigate the economic impact. Authorities announced plans to secure approximately $5 billion in budget savings to offset rising energy costs and protect fiscal stability.
This response highlights the structural vulnerability of emerging markets to external shocks, particularly those linked to energy prices. Policymakers are now balancing inflation risks with the need to maintain economic growth and investor confidence.
Bank Indonesia has also remained active in currency stabilisation efforts, intervening in foreign exchange markets to limit excessive volatility.
Short-term rebounds amid ceasefire signals
Despite the overall downward trend, markets have shown intermittent recoveries. Periods of optimism — particularly around ceasefire discussions — have led to temporary rebounds in equities and declines in oil prices.
For instance, the JCI rose nearly 2.75% following signs of potential de-escalation, reflecting how sensitive Indonesian markets remain to geopolitical headlines.
However, these gains have been short-lived, with renewed tensions quickly reversing sentiment.
A fragile outlook shaped by external risks
Over the full four-week period, Indonesia’s markets have been characterised by volatility rather than a single directional trend. The combination of higher energy prices, currency weakness, and foreign capital outflows has placed the JCI among the weaker performers in the region.
Looking ahead, the trajectory of the Iran conflict will remain the dominant external variable. Prolonged disruption to energy supply chains could deepen inflationary pressures and further strain Indonesia’s fiscal position.
At the same time, any credible de-escalation could quickly restore risk appetite and stabilise both the rupiah and equity markets.
For now, Indonesia’s financial system is holding, but the past four weeks have underscored how tightly its market dynamics are linked to global geopolitical risk — particularly when energy markets are at the centre of the shock.
Newshub Editorial in Asia – March 29, 2026
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