Indonesia has reached another disheartening milestone, with its position as Southeast Asia's largest stock market now overtaken by Singapore. According to compiled data, the total market capitalization of Indonesian listed companies has plunged over 30% from its January peak to $618 billion. In contrast, the total market value of Singapore-listed firms has risen to $645 billion. Investor sentiment toward the Indonesian market has deteriorated in recent months due to uncertainty over a potential reclassification of its stock market as a frontier market, coupled with Fitch and Moody's both revising Indonesia's rating outlook to negative. The country's stock index has been among the worst performers globally among comparable markets, while the Indonesian rupiah has repeatedly hit record lows. Soh Chih Kai, a portfolio manager at Lion Global Investors Ltd., noted that the current situation may not be favorable for Indonesia but pointed out that a recovery in the future remains possible. "Nevertheless, this reinforces the relative standing of the Singapore market, as capital flows continue to reward certainty amid global policy uncertainty," Soh said. The Singapore stock market benefits from economic and political stability, along with government-led market reforms. As the war in Iran triggers market volatility, investors have sought safe-haven assets, driving the Singapore Straits Times Index to a record high this week. By 2026, the Singapore stock market is projected to outperform Indonesia's by the widest margin on record.