Indonesian stocks plunged more than 11% after MSCI warned it may remove Indonesia from emerging-market indices, stoking fears of foreign fund outflows.

Indonesian equities suffered their steepest one-day fall in nearly three decades on Friday after MSCI signaled it may reclassify the country’s market, intensifying worries about foreign investor withdrawals.

The Jakarta Composite Index plunged by more than 11%, marking the biggest drop in 28 years as investors reacted to MSCI’s announcement. The index provider said it is reviewing whether the MSCI Indonesia Index should remain in the emerging markets universe, warning that Indonesia could be moved to “standalone market” status if it fails to make what MSCI described as sufficient improvements to its stock market.

A downgrade would represent a significant blow to Indonesia’s efforts to preserve its standing among emerging markets—a designation that helps determine whether the country is included in widely followed global benchmarks. Such benchmarks influence asset allocation decisions by international fund managers and can affect the level and stability of foreign capital flows.

The sharp sell-off reflected rising anxiety that a potential reclassification could accelerate capital outflows. Many global investors track MSCI indices directly or use them as reference points, meaning any change to Indonesia’s classification could trigger portfolio adjustments. The market’s reaction underscored the sensitivity of Indonesian assets to signals about index eligibility and international accessibility.

MSCI’s statement did not automatically change Indonesia’s status, but it put the country on notice that continued inclusion is conditional on progress in market structure and investability standards. The prospect of being shifted out of the emerging markets category and into a standalone classification—typically reserved for markets that do not meet certain criteria—adds uncertainty for companies and investors at a time when Indonesia has been working to maintain its position in global investment frameworks.

The sell-off in Jakarta was widely seen as a direct response to this added risk, with traders pricing in the possibility that international funds could reduce exposure if the review leads to a downgrade.

Why it matters

MSCI classifications can shape billions of dollars in investment flows, so a potential reclassification puts Indonesia’s access to global capital in the spotlight. The immediate market plunge shows how quickly benchmark-related signals can translate into higher volatility and fears of foreign outflows. Investors will be watching for concrete steps Indonesia takes to address MSCI’s concerns—and for any timeline or decision from MSCI that could force index-tracking funds to rebalance.