IDX Composite Plummets 4.64 Per Cent Ahead of Mid-Day Session Close; Here Are the Causes

Selling pressure in the domestic stock market has become increasingly unstoppable. The Indonesia Stock Exchange (IDX) Composite plummeted by 311.795 points, or 4.64 per cent, to the level of 6,411.525 ahead of the close of the first trading session on Monday (18/05/2026). The IDX Composite opened at 6,628.976 and briefly touched a high of 6,631.282.

The decline in the index occurred amidst the dominance of stocks moving in negative territory. A total of 704 stocks declined, while only 66 stocks strengthened and 47 remained stagnant. Trading activity was observed to be high, with transaction volumes reaching 18.297 billion shares.

Senior Market Analyst at Mirae Asset Sekuritas, Nafan Aji Gusta, assessed that pressure in the domestic stock market remains quite significant amidst the continuation of foreign capital outflows and increasing global geopolitical risks. According to the Indonesia Stock Exchange, the IDX Composite recorded a daily net foreign sell of Rp 1.35 trillion. Meanwhile, on a year-to-date (YTD) basis, net foreign selling has reached Rp 49.28 trillion, with the IDX Composite performance correcting by 22.25 per cent throughout the current year.

However, the Stochastics KD indicator still shows a negative signal, while trading volume has been recorded as decreasing. According to Nafan, the market tends to respond neutrally to negatively because the meeting between the United States and China has not yet produced any substantial or binding agreements regarding stability in the Middle East region or the normal reopening of the Strait of Hormuz routes.

“The market tends to respond neutrally to negatively because the US-China meeting has not yet resulted in substantial, binding agreements regarding Middle East stability or the normal reopening of the Strait of Hormuz route,” Nafan stated when contacted on Monday.