Denmark's A.P. Moller-Maersk and DONG Energy are in talks to merge their oil and gas operations in a deal that would create a business worth more than $10 billion including debt, sources familiar with the matter said.
Maersk is working with Bank of America on the potential deal, while JP Morgan is assisting Dong Energy, said the people, who cautioned there is no certainty the parties would come to terms.
Maersk said in September it planned to merge or spin-off its energy assets as part of a major restructuring and instead focus on its core transport and logistics businesses.
DONG Energy said this month it was putting its oil and gas assets up for sale, as it wants to shift away from fossil fuels towards offshore wind.
Some analysts have said, however, that it could be hard to find buyers, with many other energy companies also putting assets up for sale due to low oil prices.
"The only thing that would make sense is a complete merger of their businesses,", said one of the sources, who asked not to be names because the deliberations are private.
A spokesman for DONG said: "We are in the very early stages of the sales process. There will be no sale before the end of the year and it is far too early to speculate over timing and indeed potential buyers."
Maersk, Bank of America, JP Morgan declined to comment.
Maersk held talks last year on possibly buying DONG Energy's oil and gas business, but the companies failed to agree on a price, Bloomberg reported
Maersk Oil has suffered a series of setbacks, first and foremost when Qatar chose not to extend its 25-year licence to operate the giant Al Shaheen field.
DONG Energy Chief Executive Henrik Poulsen said this month the company was "still in a very early stage of exploring market interest, but it is our impression that there is interest in an asset of this kind."
DONG has said cash flow at its oil and gas business breaks even at $35 per barrel. It has been producing 89,000 barrels of oil and gas per day this year, down from 115,000 barrels of oil and gas daily last year.
Maersk has previously held talks about buying a large part of the North Sea portfolio that Shell is looking to sell as part of a divestment plan.
(By Sophie Sassard and Ron Bousso; Additional reporting by Jacob Gronholt-Pedersen in Copenhagen; Editing by Mark Potter)