Class action

A class action lets many similarly situated plaintiffs sue as a group. Securities class actions often follow an enforcement action, using the regulator's allegations as their factual foundation.

compliance and practice · updated 2026-09-08

See also

• Private right of action — A private right of action lets an injured party sue directly rather than relying on a regulator. Rule 10b-5 carries an implied one…
• Loss causation — Loss causation is the requirement that the defendant's misconduct, rather than some other factor, caused the plaintiff's loss. It …

Terms that refer here

Fraud on the market · Private right of action

Back to the full glossary — 261 defined terms.