Amplify Energy Corporation (AMPY) , a U.S.-based upstream energy player, reported that the sheen, off the coast of Huntington Beach in California, as seen on Mar 8, is not known to be related to its operations. Shares of the company plunged nearly 18% on Friday, following reports of the oil spill.The U.S. Coast Guard revealed that any remaining recoverable oil sheen was not observed during the morning overflight conducted off the coast of Huntington Beach. It is still unclear if the sheen was caused by a le ...