FINRA Rule 5320

Rule 5320 — which became effective September 12, 2011 — consolidated and replaced several predecessor rules including NASD IM-2110-2 governing customer limit order trading ahead and NASD Rule 2111 governing customer market order trading ahead — creating a unified customer order protection framework applicable to both market and limit orders in both NMS stocks and OTC equity securities.

The Core Prohibition — What Trading Ahead Means

The fundamental prohibition of Rule 5320 is straightforward — a member that accepts and holds a customer order without immediately executing it may not trade the subject security on the same side of the market for its own account at a price that would satisfy the customer order.

Trading ahead on the same side of the market means trading in the same direction as the customer's order — buying for the member's own account when holding a customer buy order at the same or better price, or selling for the member's own account when holding a customer sell order at the same or better price. If a member holds a customer limit order to buy one thousand shares at thirty dollars, the member is prohibited from purchasing shares for its own account at thirty dollars or less before executing the customer's order — because that purchase would directly satisfy the customer's order parameters at the expense of the customer who is waiting for execution.

The prohibition applies regardless of whether the customer's order is a market order or a limit order — both types of customer orders are protected against trading ahead under Rule 5320. The prohibition applies to trades on the same side of the market only — a member holding a customer buy order is not prohibited from selling shares for its own account at the same price, since that would not satisfy the customer's buy order.

The Make-Good Obligation

When a member inadvertently trades ahead of a customer order — or when it trades ahead under specific permissible circumstances — Rule 5320 imposes a make-good obligation requiring the member to immediately execute the customer order at the same or better price at which the proprietary trade was executed, up to the size of the proprietary trade.

The make-good obligation ensures that any proprietary trading that occurs while a customer order is held is immediately followed by execution of the customer order on the same terms — preventing the member from benefiting from the price opportunity while the customer's order remains unfulfilled. If the member purchased one hundred shares for its own account at twenty-nine dollars while holding a customer order to buy at thirty dollars the member must immediately execute the customer's order at twenty-nine dollars — giving the customer the benefit of the more favourable price at which the member traded.

The make-good obligation is cumulative with the customer's original order — if the member's proprietary trade was for a smaller quantity than the customer's order the make-good obligation covers the quantity of the proprietary trade at the improved price, and the remainder of the customer's order continues to be held and executed in accordance with the rule's requirements.

The Large Order Exception

Rule 5320 provides a specific exception for large orders — allowing members to trade ahead of customer orders of ten thousand shares or more — unless such orders are less than one hundred thousand dollars in value — without triggering the rule's protections, provided the member makes specified disclosures to the customer about the possibility of proprietary trading at prices that would satisfy the customer's order.

The large order exception reflects the regulatory judgement that institutional and large retail investors placing orders of this size are sophisticated enough to understand and manage the risk of proprietary trading by their broker-dealer — and that the operational burden of applying Rule 5320's full protections to very large orders could impair market liquidity and the efficiency of institutional order execution.

For the large order exception to apply the member must disclose to the customer that the member may trade proprietarily at prices that would satisfy the customer's order — and must provide the customer with a meaningful opportunity to opt in to Rule 5320's full protections with respect to all or any portion of the order. A customer who chooses not to opt in to the protections has effectively consented to proprietary trading at prices that would satisfy their order — eliminating the conflict between the member's proprietary trading interests and the customer's order execution rights.

The opt-in disclosure may be provided at account opening and annually thereafter in writing — covering all large orders placed by that customer throughout the year — or may be provided orally on an order-by-order basis with documentation of who provided consent and evidence of the customer's understanding of the terms.

The Institutional Account Exception

Rule 5320 provides a comprehensive exception for institutional accounts — allowing member firms to trade proprietarily at prices that would satisfy orders placed by institutional customers without triggering the rule's protections.

An institutional account for Rule 5320 purposes encompasses the standard definition of institutional account under FINRA Rule 4512(c) — including banks, insurance companies, registered investment companies, registered investment advisers, governmental entities, employee benefit plans with at least ten million dollars in assets, and other specified categories of sophisticated institutional investors.

The institutional account exception — like the large order exception — is conditioned on disclosure to the institutional customer of the possibility of proprietary trading at prices that would satisfy their orders, and on the provision of a meaningful opportunity to opt in to Rule 5320's full protections. An institutional customer that opts in to the protections receives the full benefit of Rule 5320 regardless of order size.

The No-Knowledge Exception — Information Barrier Framework

Rule 5320 provides a critically important exception for member firms that maintain effective information barriers between separate trading units — allowing proprietary trading by a non-market-making trading unit that has no knowledge of customer orders held by a separate trading unit.

This no-knowledge exception addresses the operational reality of large broker-dealers with multiple separate trading desks that function independently without sharing information about customer order flow. A member firm that maintains an effective information barrier — preventing its equity proprietary trading desk from accessing information about customer orders held by its agency execution desk — can permit the proprietary desk to trade without violating Rule 5320 with respect to customer orders that the proprietary desk has no knowledge of.

The effectiveness of the information barrier is the critical determinant of whether the exception applies — a nominal barrier that is routinely circumvented or that fails to prevent the flow of customer order information to the proprietary trading desk does not satisfy the no-knowledge exception. The written supervisory procedures required by FINRA Rule 3110 must specifically address the information barrier framework and the procedures for ensuring that proprietary trading units do not have access to customer order information.

Application to NMS Stocks and OTC Equity Securities

Rule 5320 applies to two categories of equity securities — NMS stocks as defined in Rule 600 of SEC Regulation NMS and OTC equity securities as defined in FINRA Rule 6420.

For NMS stocks — exchange-listed equity securities subject to Regulation NMS's order protection and market access requirements — Rule 5320 applies to both market-making and non-market-making trading by member firms. For NMS stocks where a member structures its order handling to permit its market-making desk to trade at prices that would satisfy customer orders held by a separate trading unit the member must provide customers with written disclosure of this practice at account opening and annually thereafter.

For OTC equity securities — equity securities traded in the over-the-counter market that are not NMS stocks — the information barrier framework plays a different role. A member that implements and utilises an effective system of internal controls — such as appropriate information barriers — that prevents a non-market-making trading unit from obtaining knowledge of customer orders held by a separate trading unit may permit the non-market-making unit to trade proprietarily at prices that would satisfy the customer orders held by the separate unit.

Not-Held Orders and Rule 5320

Rule 5320 does not apply to not-held orders — orders that the customer has specifically given the broker discretion to work in a manner designed to achieve best execution rather than requiring immediate execution at a specific price or on a specific timeline.

A not-held order gives the executing broker discretion over the timing and pricing of execution — the customer has specifically consented to the broker using its professional judgement about when and how to execute the order rather than requiring mechanical priority-based execution. Because the customer has granted discretion over execution mechanics the conflict between proprietary trading and customer order priority does not arise in the same way for not-held orders as it does for held orders.

The not-held designation must be clearly documented — a member firm cannot treat an order as not-held without explicit customer instruction to that effect. An order that is not designated not-held by the customer must be treated as held and is subject to the full protections of Rule 5320.

Connection to Best Execution and Front Running

Rule 5320 operates alongside FINRA Rule 5310 — the best execution rule — and FINRA Rule 5270 — which prohibits front running of block transactions — to create the comprehensive customer order handling protection framework applicable to member firms.

FINRA Rule 5310 requires member firms to seek the best available execution for customer orders — the affirmative obligation to route orders to the best available market. Rule 5320 is the protective counterpart — prohibiting the member from disadvantaging the customer by trading for its own account at prices that would satisfy the customer's order before the customer is served. Together the two rules ensure that customer orders are both pursued diligently and protected from the member's competing proprietary interests.

FINRA Rule 5270 — which prohibits front running of imminent block transactions — addresses the more specific situation where a member has knowledge of a customer's imminent large block order and trades for its own account in anticipation of the price movement the block order will cause when executed. While Rule 5270 is limited to imminent block transactions FINRA has clarified that front running of other types of customer orders — and the misuse of knowledge of customer orders more broadly — may violate FINRA Rule 5320 and FINRA Rule 2010's standards of commercial honor even when Rule 5270's specific block transaction prohibition does not apply.

Examination Relevance and Key Takeaways

FINRA Rule 5320 is tested on the Series 7 examination in the context of customer order handling obligations, the prohibition on trading ahead, the large order and institutional account exceptions, and the no-knowledge information barrier framework.

The key points to retain are these.

FINRA Rule 5320 — Prohibition Against Trading Ahead of Customer Orders — prohibits member firms that accept and hold customer orders without immediately executing them from trading the subject security on the same side of the market for their own account at a price that would satisfy the customer order. When a member does trade ahead it must immediately execute the customer order at the same or better price up to the size of the proprietary trade — the make-good obligation.

The large order exception — for orders of ten thousand shares or more and one hundred thousand dollars or more in value — permits proprietary trading at prices that would satisfy the customer order provided the member discloses this possibility and gives the customer a meaningful opportunity to opt in to Rule 5320's full protections. The institutional account exception permits proprietary trading ahead of institutional customer orders subject to the same disclosure and opt-in framework. The no-knowledge exception permits proprietary trading by a non-market-making trading unit that has no knowledge of customer orders held by a separate trading unit through an effective information barrier — permitting large firms with multiple separate trading desks to maintain independent proprietary trading operations without systematic violations of Rule 5320. Not-held orders — where the customer grants the broker discretion over execution timing and pricing — are outside the scope of Rule 5320's protections. Rule 5320 applies to both NMS stocks and OTC equity securities and operates alongside Rule 5310's best execution requirements and Rule 5270's block transaction front running prohibition.