Suspicious Activity Report (SAR)
A report a regulated financial institution, including many crypto exchanges, must file with authorities when it detects potentially suspicious transaction activity.
A Suspicious Activity Report (SAR) is a report a regulated financial institution — including many crypto exchanges operating under applicable regulation — must file with the relevant financial authorities when it detects transaction activity that appears potentially suspicious, such as patterns consistent with money laundering or fraud.
Filing a SAR is generally a confidential, mandatory compliance obligation, not optional, and the institution is typically prohibited from informing the customer involved that a report was filed, making this a mostly invisible part of a regulated exchange's ordinary compliance operations.
Examples
- A regulated exchange detecting an unusual pattern of transactions may be legally required to file a SAR, without informing the customer involved that it did so.
- SAR filing is a standard, mandatory compliance obligation for regulated financial institutions, including many crypto exchanges, not a discretionary choice.