Denmark's A.P. Moller-Maersk tumbled to a loss of $2.5 billion in the last three months of 2015 after the shipping and energy group wrote down the value of its oil assets by the same amount.
Maersk warned investors on Wednesday that it expects its underlying net result in 2016 to be significantly below 2015's $3.1 billion as it struggles with plummeting oil prices and low rates for container freight. Its shares fell as much as 9 percent in early trading and were down 4.4 percent by 0855 GMT.
Chief Executive Nils Smedegaard Andersen said the oil price was the biggest short-term challenge for the company.