The SEC proposed amendments to Rule 15c3-3, the Customer Protection Rule, on July 12, 2023. The amendments require certain broker-dealers to increase the frequency with which they compute net cash owed to customers and other broker-dealers — known as proprietary securities accounts of a broker-dealer (PAB account holders) — from weekly to daily.
The public comment period will remain open for 60 days following publication of the proposal release on the SEC website or 30 days following publication of the proposal release in the Federal Register, whichever period is longer.
Proposed rule changes explained
Rule 15c-3 provides protection to customer funds and securities by requiring carrying broker-dealers, broker-dealers that have custody of customer cash and securities, to segregate their business activities from customer and PAB funds and by preventing carrying broker-dealers from using customer assets to finance any part of their business.
This allows customer securities and cash to be readily available for distribution to customers in the event of a liquidation. Carrying broker-dealers are required to have a special reserve account for the exclusive benefit of customers (EBOC) or the customer reserve bank account, or a PAB reserve account at a bank to hold cash and qualified securities as determined by the 15c3-3 computation.
SEC Chair Gary Gensler commented that given the speed, scale, and volume of today’s market activity, customers would benefit if broker-dealers carrying large credit balances made daily reserve account calculations and deposits.
Issues with the current rule
Currently, the rule requires carrying broker-dealers to perform the computation weekly as of the close of the last business day of the week and to make the required deposit by 10:00 a.m. of the second business day following the as of date of the computation.
Activity after the customer and PAB reserve computation date can result in a broker-dealer having large amounts of additional deposits that aren’t accounted for until the next reserve computation and don’t get reserved for until the next deposit into the customer and PAB reserve bank accounts.

