Domestic investors steer IDX rebound as foreign sell-offs and MSCI concerns linger

After a severe decline in the first half of 2026, the Indonesia Stock Exchange Composite index has begun a gradual ascent, gaining 4.64% in August and ending the month at 6,541.38 points. The rally is now largely fueled by domestic investors, a shift from earlier reliance on foreign capital. The earlier market rout was sparked by MSCI’s warning over Indonesia’s market transparency, which led to panic selling, two trading halts, and a freeze on adding new Indonesian stocks to its indices.

MSCI has signaled that the country could be reclassified from an emerging to a frontier market if reforms are not made, a prospect that Goldman Sachs says could cause as much as US$13 billion to flee the market. While the index has recovered some ground, it remains down 25% from the start of the year, making it the poorest-performing Asian benchmark. The situation underscores the growing influence of local investors and the lingering vulnerability to external sentiment and index-provider decisions.