A List of The Biggest class action settlements Tobacco settlements for $206 billion [The Largest Ever] ... BP Gulf of Mexico oil spill $20 billion. ... Volkswagen emissions scandal $14.7 billion. ... Enron securities fraud $7.2 billion. ... WorldCom accounting scandal $6.1 billion. ... Fen-Phen diet drugs $3.8 billion. More items... Jun 1, 2023