Investigators of the Attorney General’s Office (AGO) have traveled to Singapore in pursuit of key information related to an ongoing investigation into high-profile corruption case involving officials of State energy company PT Pertamina and oil&gas contractors. 

The probe centers on alleged irregularities in the procurement and management of crude oil and refinery products between 2018 and 2023, with potential State losses estimated at Rp193.7 trillion (US$11.8 billion).

AGO spokesman, Harli Siregar, said the investigation team has been stationed in Singapore since June 1, 2025, as part of an agency-to-agency cooperation arrangement.

“Three corporations have agreed to be questioned and provide testimony in Singapore, while two others will do so online,” Harli told a press conference on Friday, June 6, 2025.

He confirmed that testimonies have already been collected from several foreign nationals and company representatives based in Singapore. Although details remain classified, the ongoing collaboration between the AGO and Indonesia’s diplomatic attachés in Singapore is seen as a crucial step in untangling the complex web of alleged corruption.

The investigative team was initially scheduled to return to Jakarta on June 4. However, Harli said that their stay could be extended as more parties have expressed willingness to provide testimony voluntarily.

“We are still waiting for additional individuals to come forward. If that happens, the investigation team’s assignment may be prolonged,” he noted.

International cooperation

The case highlights the increasing transnational dimensions of major corruption investigations, particularly in the energy sector. The AGO’s cooperation with Singaporean authorities is seen as a key test of regional collaboration in tackling financial crime involving state enterprises.

While further updates from the Singapore trip remain pending, officials emphasized that all findings will be evaluated to support the prosecution process and potentially identify additional suspects or corporate entities.

Suspects named

The AGO has named nine suspects in the case, encompassing top executives from Pertamina and its subsidiaries, as well as private sector actors. They are

Riva Siahaan, President Director at Pertamina’s commercial and trading subholding PT Pertamina Patra Niaga;

Sani Dinar Saifuddin, Director of Feedstock and Product Optimization at Pertamina’s Refinery and Petrochemical subholding PT Kilang Pertamina Internasional;

Yoki Firnandi, President Director at pertamina’s shipping subholding PT Pertamina International Shipping;

Agus Purwono, VP of Feedstock Management at PT Kilang Pertamina Internasional;

Muhammad Kerry Andrianto Riza, Beneficial Owner, PT Navigator Khatulistiwa;

Dimas Werhaspati, Commissioner at PT Navigator Khatulistiwa and PT Jenggala Maritim;

Gading Ramadhan Joedo, Commissioner at PT Jenggala Maritim and Director at PT Orbit Terminal Merak;

Maya Kusmaya, Director of Central Marketing and Trade at Pertamina Patra Niaga; and

Edward Corne, VP of Trading Operations at Pertamina Patra Niaga.

The AGO believes these individuals conspired with brokers to manipulate the procurement process for crude oil and refined fuel products. This alleged collusion resulted in vast financial damage to the state, prompting intensified cross-border efforts to trace evidence and secure testimonies abroad.