The Indonesia Stock Exchange (IDX) has shown signs of a gradual recovery following a sharp decline in the first half of the 2026 financial year, though it remains vulnerable to foreign capital outflows amid ongoing global uncertainties and concerns over an upcoming review by index provider Morgan Stanley Capital International (MSCI). Domestic investors have increasingly become key players in the market's recent performance.

The IDX Composite Index, which had experienced a severe downturn in early 2026, has been trending upward since mid-year, recording a 4.64% gain in August alone. The index closed at 6,541.38 points recently, despite a regional market slump. However, it remains down 25% year-to-date, marking it as the worst-performing major Asian stock market this year.

The market turbulence earlier in the year was largely triggered by MSCI’s warnings over Indonesia’s stock market transparency and investability. Since late 2025, MSCI engaged in discussions with Indonesian authorities and market participants, expressing concerns about the opacity of the market. In January 2026, MSCI halted the addition of new Indonesian stocks to its indexes and cautioned that the country could be downgraded from emerging market to frontier market status unless significant reforms were undertaken.

This warning prompted a wave of panic-selling, resulting in two trading halts. Goldman Sachs estimated that a potential downgrade could trigger capital outflows amounting to as much as US$13 billion. In response, Indonesian authorities introduced capital market reform measures aimed at enhancing transparency, including increasing the free float of listed shares and addressing issues related to concentrated share ownership.

MSCI acknowledged these reforms and maintained Indonesia’s emerging market classification during its June review but indicated that a downgrade could still occur if progress was insufficient by the time of the November 2026 review. The freeze on index changes involving Indonesian stocks remains in effect, limiting the inclusion of new listings and adjustments in index weightings.

In recent months, MSCI has removed several notable Indonesian large-cap stocks during its quarterly rebalancing, such as PT GoTo Gojek Tokopedia, PT Barito Renewables Energy, and PT Amman Mineral Internasional. Capital market analyst and Traderindo founder Wahyu Laksono noted that such removals may compel foreign investors to offload Indonesian equities included in the index, potentially exerting further downward pressure on the market.

Overall, while domestic investors have helped buoy the market during this period, the IDX remains susceptible to shifts in foreign investment influenced by MSCI’s classification decisions and global market conditions. The upcoming November review will be closely watched as a critical determinant of the IDX’s near-term outlook.