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Anadarko’s Kerr-McGee Held Liable in Tronox Spinoff

Anadarko Petroleum Corp. and its Kerr-McGee unit acted improperly in the 2005 spinoff of Tronox Inc. and may have to pay as much as $14 billion related to environmental cleanup and health claims, a judge ruled.

Anadarko plunged 9.3 percent in after-hours trading, cutting its market value to $38 billion. The judge's ruling yesterday weighed how much money can be recovered from a successor to a polluting company, even after bankruptcy has ostensibly cleaned the slate of obligations. The company said it expects to appeal the ruling.