Anastasya Lavenia Yudi, Jakarta – The Indonesia Stock Exchange (IDX) recorded a 7.37 percent decline in market capitalization this week, reaching Rp15,046 trillion from Rp16,244 trillion the previous week. This represents a decrease of Rp1,198 trillion this week.

"Stock trading data on the IDX closed mixed for the period January 26-30, 2026," said IDX Corporate Secretary Kautsar Primadi Nurahmad in an official statement, quoted on Sunday, February 1, 2026.

Last week, the Jakarta Composite Index (JCI) plunged 8 percent on January 28-29, 2026, following the announcement by Morgan Stanley Capital International (MSCI). Over the course of the week, the JCI weakened 6.96 percent, reaching 8,329.6 at the close of trading on Friday, January 30, 2026.

Kautsar stated that foreign investors recorded net selling of Rp1.53 trillion on Friday, January 30, 2026. Throughout 2026, foreign investors recorded net selling of Rp9.88 trillion.

"The highest increase occurred in the average daily transaction value on the IDX, which rose 29.28 percent to Rp43.76 trillion, from Rp33.85 trillion the previous week," Kautsar said.

Furthermore, the average daily transaction frequency increased 1.59 percent to 3.82 million transactions, from 3.76 million transactions the previous week. Meanwhile, the exchange's daily transaction volume this week decreased 3.69 percent to 63.3 billion shares, from 65.73 billion shares the previous week.

Following the release of MSCI's issue of questions about the transparency of Indonesian stock free float data, IDX Director Iman Rachman resigned from his position on Friday, January 30, 2026.

One day later, four Financial Services Authority (OJK) officials also announced their resignations.

They are Chairperson of the OJK Board of Commissioners Mahendra Siregar, Deputy Chairperson of the OJK Board of Commissioners Mirza Adityaswara, Chief Executive for Capital Market Supervision, Financial Derivatives, and the OJK Carbon Exchange Inarno Djajadi, and Deputy Commissioner for Issuer Supervision, Securities Transactions, Special Inspections, Financial Derivatives, and the OJK Carbon Exchange I.B. Aditya Jayaantara.

Source: https://en.tempo.co/read/2084278/idx-market-capitalization-decreases-by-rp1198-trillion-in-a-wee