Final answer:
SARs (Suspicious Activity Reports) are required to be filed by BDs whenever a transaction or group of transactions equals or exceeds a certain threshold specified by law.
Step-by-step explanation:
In the context of Business, SARs (Suspicious Activity Reports) are required to be filed by BDs (Broker-Dealers) whenever a transaction or group of transactions equals or exceeds a certain threshold specified by law.
For example, in the United States, federal law requires financial institutions, including BDs, to file SARs when a transaction or a series of related transactions equal or exceed $5,000, and the institution knows, suspects, or has reason to suspect that the transaction(s) involve illegal activity or is intended to disguise funds from illegal activities.