The Judicial Panel on Multidistrict Litigation (JPML) serves as the clearinghouse for a huge portion of the federal caseload. Over half of all federal civil cases currently reside in a multidistrict litigation (MDL), either because the matters were transferred there via the JPML or were directly filed into an MDL previously established by the panel. See Wittenberg, Daniel S., “Multidistrict Litigation: Dominating the Federal Docket,” American Bar Association, Feb. 19, 2020. Despite the increasing prevalence of MDLs and the frequency with which attorneys may encounter cases that are or become part of an MDL, most practitioners are likely less familiar with the unique quirks of practicing before the panel, specifically when arguing over MDL formation and expansion or transfer of actions to an existing MDL. Below are five rules to remember when practicing before the JPML: