At 14:43 Beijing time on Wednesday, the Indonesian stock market plummeted 8%, triggering a market-wide trading halt. This occurred after index provider MSCI Inc cited risks to investability due to a lack of transparency in ownership structures and free-float data, raising the possibility of a downgrade for the Indonesian market. Indonesian stock trading is scheduled to resume after a 30-minute suspension. MSCI Inc stated that if transparency in the Indonesian market does not show significant improvement by May, it will reassess the market's investability for global investors. This reassessment could lead to a reduction in the weighting of Indonesian stocks within the MSCI Emerging Markets Index, or even a demotion to frontier market status. MSCI Inc also expressed that investors are "concerned about the potential for coordinated trading behaviors that could disrupt normal price formation." Concurrently, MSCI announced it would not implement any Indonesia-related adjustments to its indices. The Indonesia Stock Exchange (IDX), the Securities Depository and Settlement Agency (KSEI), and the Financial Services Authority (OJK) stated they are in discussions with MSCI regarding the matter. IDX Corporate Secretary Kautsar Primadi Nurahmad said, "Previously, we enhanced transparency by publishing free-float data announcements on the IDX website. However, if MSCI deems this insufficient, we will continue discussions on data transparency in line with MSCI's suggestions to reach an agreement." KSEI and OJK did not immediately respond to requests for comment. MSCI's indices serve as benchmarks for stock price performance. The New York-based firm announced that for Indonesia, it would immediately halt any new additions to its indices and freeze upward revisions to its estimates of shares available for purchase by international investors, aiming to "reduce index turnover and investability risks." William Simadiputra, Head of Indonesian Research at DBS Bank in Singapore, commented, "We believe that if MSCI decides to reduce Indonesia's weight in the MSCI Emerging Markets (EM) Index, it could subject Indonesia to negative sentiment." "However, we think the downside risk might be limited, given the persistent foreign capital outflows since 2025." Southeast Asia's largest stock market has already been grappling with foreign outflows due to currency weakness, concerns over a widening fiscal deficit, and central bank autonomy. Data from LSEG shows that overseas investors sold a net 13.96 trillion Indonesian rupiah ($834 million) in 2025, marking the worst year for outflows since 2020, with the selling continuing into January. Despite this, Indonesia's benchmark stock index surged over 20% in 2025, repeatedly hitting record highs throughout the year and ranking as one of the top-performing markets in the region. The benchmark Jakarta Composite Index (.JKSE) fell 7.9% on Wednesday, hitting its lowest level since early November. The index was last down approximately 7% around midday.