The credit market is pricing in a 36% chance BP will default within five years as the oil giant deals with the fallout from the Gulf of Mexico disaster.
BP bonds have plunged today after the Fitch ratings agency cut its credit rating a full six notches from AA to BBB.
UK banks risk having their credit ratings downgraded because of the poor state of the country's public finances, warns ratings agency Moody's.
Warren Buffett has defended Berkshire Hathaway's large stake in credit ratings company Moody's, believing it is still a "darn good business".
Portugal's credit rating has been downgraded by the Fitch agency on concerns over its debt levels.