Environmental group Market Forces filed a complaint with the Singapore Exchange against Oversea-Chinese Banking, or OCBC (SGX:O39), for reporting gaps that could mislead investors in financing harmful fossil fuels, according to a Tuesday statement.

Asia Energy Finance Campaigner Binbin Mariana said OCBC funds Indonesia-based Harita's entities, whose operations rely on industrial coal plants powering a nickel smelter on Obi Island.

However, OCBC's public disclosures have not provided investors enough information about the true extent of the bank's exposure to companies reliant on industrial coal power facilities, the complaint said.

OCBC has pledged to exclude project financing for new coal power plants under its Responsible Financing Framework, according to the complaint.

"The Singapore Exchange needs to consider launching an investigation into whether OCBC may be misleading investors and failing its compliance with the SGX Rulebooks," Mariana said.