FINRA is issuing this Notice to reiterate that firms must report short positions in each individual firm or customer account on a gross basis under FINRA Rule 4560. Therefore, firms that maintain positions in master/sub-accounts or parent/child accounts must calculate and report short interest based on the short position in each sub- or child account. FINRA has observed that some firms erroneously report a net short interest position for each account grouping, i.e., by parent or master account, rather than reporting on a gross basis for each account, i.e., by child or sub-account.