The Swiss-headquartered mining giant had yet another challenging year in 2019, falling one spot as it booked a $404 million loss. That was on the back of weaker commodities prices, particularly for coal, and on $2.8 billion in impairment charges, tied partly to its copper mining operations in the Democratic Republic of Congo and Zambia. Meanwhile, Glencore continues to be dogged by investigations by U.S. and U.K. regulators into allegations of bribery and corruption, which the company denies. In January, Glencore said it was cooperating with a criminal investigation by Swiss authorities into its operations in the DRC. Despite the ongoing regulatory and legal scrutiny, the mining company's shares rebounded solidly in Q2 in line with a jump in copper prices.