The Financial Industry Regulatory Authority (FINRA) recently adopted amendments to FINRA Rule 4210 Margin Requirements (Amendments), which will substantially alter the supervision and regulation of margin day trading. The Amendments were designed to simplify existing requirements around active trading while modernizing the rules to reflect advances in real-time risk monitoring technology.
Previous Rules
Prior to the Amendments’ June 4, 2026 effectiveness, FINRA relied on a “pattern day trader” framework to impose stringent requirements on trading activity historically seen as higher risk. Generally, any trader who executed four or more day trades within five business days was designated a “pattern day trader.” Rule 4210 required that traders designated as pattern day traders maintain $25,000 equity in their margin accounts at all times. Pattern day traders were also subject to “day-trading buying power” limits (a function of the equity in the trader’s account the day before), and significant restrictions and penalties for both the pattern day trader and broker-dealers if special margin calls were not satisfied within five business days. The strict requirements often discouraged market participants from actively trading, which inherently frustrated the regulator’s goals of providing open access to U.S. public markets.
New Rules
The Amendments eliminate the pattern day trader concept and framework and seek to promote active trading while maintaining appropriate regulatory oversight and investor protection controls. With the adoption of the Amendments, there is no longer a distinction between traders who make and do not make four or more day trades within five business days, no $25,000 minimum equity requirement, no day-trading buying power restrictions, and no special maintenance margin provisions associated with the pattern day trader designation.
Instead, the Amendments require that broker-dealers determine each customer account’s “intraday margin level” (IML) and “intraday margin deficit,” two key concepts in the Amendments’ new framework. IML is defined as the amount of cash the customer could withdraw (or would have to deposit) to still have the required maintenance margin. “Intraday margin deficit” is defined as the largest negative intraday margin level reached during the trading day after any IML-reducing transaction (a transaction that reduces a customer’s intraday margin level).
Broker-dealers can comply with the Amendments by monitoring customer accounts in real time, or by performing a single end-of-day calculation to identify the largest intraday margin deficit for each customer for each day. Real-time monitoring is not a requirement under the Amendments. The rule sets several key parameters for members to consider in determining an IML or intraday margin deficit, including:
- sweep programs
- market value
- “as of” actions
- treatment of deposits and withdrawals
- multiple legs of a strategy and options exercised and liquidated on the same day1
The Amendments provide that if two or more activities in a margin account occurred during a day and the member cannot demonstrate that one activity occurred before another activity, then the IML with respect to such activities must be computed on the assumption that the activities occurred in an order that results in the highest intraday margin deficit for such day.
If a broker-dealer identifies an intraday margin deficit in an account on a day when there is an IML-reducing transaction in such account, then the broker-dealer must require such intraday margin deficit to be satisfied as promptly as possible. If a customer fails to satisfy the deficit within five business days, the broker-dealer must enforce written policies and procedures reasonably designed to prevent the customer from creating or increasing a short position or debit balance (other than by closing a short position) for 90 calendar days after such fifth business day or until the intraday margin deficit has been satisfied.
Though the Amendments are effective, FINRA members that need more time to implement the rule change will be permitted to phase in their implementation over a period of 18 months, until October 20, 2027.
Conclusion
The Amendments represent a significant development in the regulatory framework of margin day trading. Notably, the Amendments represent a clear shift away from a framework based on static thresholds toward a risk-calibrated approach with a focus on more frequent monitoring of account activity and satisfaction of margin deficits. Broker-dealers should ensure their monitoring systems and processes comply with the Amendments’ obligations. Proponents say the Amendments provide more flexibility and transparency around buying power for margin traders, while providing an overdue modernization of the rules.
If you have any questions about the Amendments, please contact a member of Wilson Sonsini’s Fintech and Financial Services practice.
[1] See Regulatory Notice 26-10 FINRA Adopts New Intraday Margin Standards to Replace the Day Trading Margin Requirements available at https://www.finra.org/rules-guidance/notices/26-10.
