 SAN DIEGO, Oct. 5, 2021 PRNewswire -- Shareholder rights law firm Johnson Fistel, LLP is investigating potential violations of the federal securities laws by Amplify Energy Corp. NYSE: AMPY. On October 4, 2021, Amplify Energy said its Beta Offshore subsidiary first observed and notified the U.S. Coast Guard of an oil sheen about four miles off the coast in Southern California. 