Hart-Scott-Rodino Antitrust Improvements Act of 1976 (HSR Act)
Definition
Antitrust law providing that certain qualifying mergers and other acquisitions that meet various threshold requirements may not be completed until the parties make a pre-merger filing with, and seek approval of, the United States Federal Trade Commission and the Department of Justice. The HSR Act provides for a post-filing waiting period that must expire prior to consummation of the transaction, during which the agencies investigate any anti-trust concerns and, if necessary, extend the waiting period until the investigation is completed.