If BP walks away from the holdings completely it could write down up to $25 billion, it said.
An Unearthed and HuffPost investigation identified at least eight trade associations the companies failed to disclose in transparency reports.
The people who cleaned up the 200 million-gallon Deepwater Horizon oil spill say they are still dealing with the health and economic fallout.
Eight years later, scientists are confirming the lasting impact of the BP oil spill -- and what may have made it worse.
One of the reports also sheds light on the effect on herring of a 1989 spill in Alaska.
Activists shut down the British Museum on the opening day of BP-funded exhibition "Sunken Cities."
On the sixth anniversary of the spill, new research reveals its true scope.
BP is humiliated by rare rejection of "say on pay" proposal.
Oil companies are looking like risky investments to some.
Two supervisors in charge of safety during the Deepwater Horizon explosion were charged with 11 counts of manslaughter.