IDX Composite Suddenly Rises 1%, Here Are the Causes

The Indonesia Stock Exchange (IDX) Composite strengthened by 1% during trading on Tuesday (1/9/2026), with banking stocks acting as the primary engine for the index’s gains.

Based on data from the Indonesia Stock Exchange (BEI) observed during trading until approximately 13:52 WIB, the IDX Composite rose by 65.07 points or 1% to the level of 6,590.55. The index moved within a range of 6,535.80 to 6,592.74.

The strengthening of the IDX Composite was mainly supported by a surge in large-cap banking stocks. PT Bank Rakyat Indonesia (Persero) Tbk (BBRI) was the largest contributor, adding approximately 13.98 points to the index, with its share price at Rp3,350.

Furthermore, PT Bank Central Asia Tbk (BBCA) contributed 9.39 points, with its share price at the Rp6,575 level. PT Bank Mandiri (Persero) Tbk (BMRI) also contributed 7.82 points with a share price of Rp4,320.

The rise in these major banking stocks aligns with positive sentiment towards the banking sector. During morning trading, BBRI, BMRI, BBNI, and BBCA were all recorded to have risen in unison.

In addition to banking, several commodity stocks also supported the IDX Composite. Bumi Resources (BUMI) contributed 5.47 points, followed by United Tractors (UNTR) with 4.42 points and Astra International (ASII) with 3.47 points.

Sectorally, almost all sectors were in the green zone. The utilities sector led the gains with an increase of 1.92%, followed by non-primary consumer goods at 1.90% and financials at 1.56%. The energy sector also strengthened by 1.36%, while the industrial sector rose by 0.86%.

On the other hand, pressure was still visible in the technology sector, which corrected by 2.15%.

The strengthening of the IDX Composite was also supported by foreign fund inflows. During the first session, foreign investors recorded a net buy of Rp972.64 billion, which further bolstered market sentiment.

This market strength occurred as investors closely monitored several domestic sentiments, including the release of August inflation data, manufacturing PMI, and the trade balance, as well as developments in global sentiment.