Banks have tightened credit to the sector, in part due to troubles at Singapore-based Hin Leong Trading Pte Ltd, formerly one of Asia's largest fuel traders. Some banks, like ABN Amro and the Swiss arm of BNP Paribas, have exited trade and commodity financing.

Below are some notable cases in the sector.

2020

Company: Agritrade International Pte Ltd

Base: Singapore

Summary: Agritrade International was placed under judicial management in February after it collapsed amid allegations of fraud. It owed $1.55 billion, including $983 million to at least 20 banks.

Companies: Hin Leong Trading Pte Ltd, Ocean Tankers (Pte) Ltd., Xihe Holdings Pte Ltd and four of Xihe's special purpose vehicles

Base: Singapore

Summary: Several companies owned by Singaporean tycoon Oon Kuin Lim and his children were placed under court-led restructuring after Lim said he didn't disclose $800 million of losses.[L3N2CB0XA]

The collapse of the companies has prompted multiple lawsuits among traders such as Unipec, Trafigura, and several banks over cargo claims and payments.

Italy's UniCredit SpA has sued Hin Leong and Glencore over a letter of credit, one of several the Singapore oil trader sought from lenders for oil purchases but used to pay debt instead.

Seven tankers of the near 150-strong fleet owned by the Lim family have been put up for sale.

Company: ZenRock Commodities Trading Pte Ltd

Base: Singapore

Summary: The Singapore High Court put ZenRock Commodities under interim judicial management in May after one of its creditors HSBC Holdings PLC alleged "highly dishonest transactions" at the firm. Zenrock owes more than $600 million to creditors.

Banque de Commerce et de Placements SA, DIFC Branch, has sued China Aviation Oil (Singapore) Corp Ltd over an alleged fraudulent deal as the Swiss bank seeks to reclaim the $19 million it paid to CAO for a cargo BCP financed on behalf of ZenRock.

Company: Hontop Energy (Singapore) Pte Ltd

Base: Singapore

Summary: Hontop Energy (Singapore) Pte Ltd owes nearly $470 million to seven banks and was placed under court supervision after banks alleged suspicious transactions.

BP terminated four trading and operations staff responsible for Chinese crude oil sales as a result of an internal investigation into trades with Hontop.

Company: GP Global

Base: United Arab Emirates

Summary: GP Global, a supplier of marine fuels worldwide with offices in Europe, Asia and America, is undergoing restructuring after it said it had failed to "get full support from a few financial institutions" and that an internal investigation revealed employee fraud.

Company: Phoenix Commodities Pvt Ltd

Base: Dubai and Singapore

Summary: The agricultural products trader is being liquidated after amassing more than $400 million in potential trading losses.

Company: Coastal Oil

Base: Singapore

Summary: Two former employees of Singapore marine fuel firm Coastal Oil were charged in June for allegedly creating fictitious sales contracts and invoices to obtain financing between July 2017 and December 2018 to cheat eight banks of more than $340 million.

Company: Idemitsu Kosan Co

Base: Hong Kong

Summary: Idemitsu booked $36 million in losses related to a remittance fraud at its chemicals unit in Hong Kong in the second quarter of 2020.

2019

Company: Petro-Diamond Singapore (PDS)

Base: Singapore

Summary: Japan's Mitsubishi Corp said in September 2019 that a trader at PDS had lost $320 million through unauthorised transactions in crude oil derivatives. Mitsubishi shut the 30-year-old Singapore oil-trading unit following the losses.

Company: Inter-Pacific Petroleum Pte (IPP)

Base: Singapore

Summary: The Singapore marine fuel supplier was placed under a court-appointed supervisor to manage more than $168.5 million in outstanding liabilities. Singapore's Maritime Port Authority had earlier suspended IPP's licence to operate bunker fuel tankers after detecting operational irregularities during an inspection.

2018

Company: Royal Dutch Shell

Base: Singapore

Summary: Around $150 millions' worth of oil was stolen from Royal Dutch Shell's biggest refinery over several years. Two Vietnamese have been sentenced to jail for their involvement in the oil heist case. The founder of Sentek Marine & Trading, one of Singapore's biggest marine fuel suppliers, has been charged for his involvement in the theft.

(Compiled by Florence Tan; editing by Richard Pullin)