Rule 15c3-3

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Rule 15c3-3

An SEC rule requiring broker-dealers to keep securities for which a client has paid in full separate from securities the client has purchased on margin as well as from securities used as collateral on a margin account.

Rule 15c3-3

An SEC rule that regulates the manner in which broker-dealers handle customers' fully paid securities and security values in excess of margin requirements. Fully paid securities must be segregated by broker-dealers.