Multidistrict Litigation (MDL)

Multidistrict litigation, or MDL, is a federal procedure that consolidates many separate but related lawsuits — often filed by plaintiffs across different states — into a single court for shared pretrial proceedings. A panel of federal judges (the Judicial Panel on Multidistrict Litigation) decides whether cases involving similar facts, like claims that a product or platform caused the same type of harm, should be transferred to one judge to avoid duplicated discovery and inconsistent rulings.

MDL is easy to confuse with a class action, but the two work differently. In a class action, one case represents an entire group of people, and a single settlement or verdict typically resolves everyone’s claim at once. In an MDL, each plaintiff’s lawsuit stays legally separate — they share pretrial steps like discovery and expert testimony, but each case can still be settled, tried, or dismissed individually. That’s why an active MDL doesn’t necessarily mean there’s a settlement fund or a claim form yet; it means related lawsuits are being coordinated, not resolved.

A common pattern inside an MDL is the bellwether trial: a small number of individual cases go to trial first to test how juries respond to the evidence and arguments. Bellwether outcomes often shape how the rest of the consolidated cases eventually resolve, whether through individual settlements, a broader settlement program, or continued litigation.

If you’re looking to join an active MDL, you’re generally not filing a claim form the way you would for a finished class action settlement — you’re having an attorney evaluate whether your situation fits the pattern the litigation is built around, then filing an individual lawsuit that gets transferred into the coordinated proceeding.

This article is for informational purposes only and is not legal advice. Laws, court proceedings, and litigation status described here can change — confirm current details with an official court source or a licensed attorney before taking action.