First the Supreme Court decided Halliburton. Then the Supreme Court decided Halliburton II. While each case had the potential to rewrite the way class actions were brought, neither turned out to be the blockbuster many thought they might. Nevertheless, the cases are significant. While Halliburton I focused on what need not be established at class certification, Halliburton II redefined what evidence can be introduced at class certification, effectively rewriting the rules for many circuits. Join Tom Gorman as he explores the implications of these key decisions for securities class actions.