Judge Forrest, in an opinion today, denied class certification in a case accusing Deutsche Bank of misleading public statements concerning its exposure to mortgage-backed securities. The opinion was driven by Judge Forrest’s decision to disqualify the plaintiffs’ expert, Michael Marek, who testified that Deutsche Bank’s global registered shares (“GRSs”) traded on an efficient market.  She concluded he was not qualified to offer the opinions he offered, and that there were major methodological problems with his opinions:
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