NSCC Proposes 24x5 Clearing Operations

The National Securities Clearing Corporation ("NSCC") proposed modifications to its rules and procedures to extend its trade, capture and clearing operating hours to a "24x5" model. 

The proposed rule change aligns with recent initiatives by various exchanges, alternative trading systems, and Securities Information Processors to offer overnight trading sessions. NSCC said it will extend its Universal Trade Capture ("UTC") system to operate continuously from Sunday at 8:00 p.m. to Friday at 8:00 p.m. Eastern Time. NSCC stated that the extended hours will facilitate the prompt clearance and central counterparty guarantee of overnight trades across different global time zones while mitigating counterparty risk.

The proposal would amend NSCC's rules to establish several new requirements and processes, including:

• Trade Acceptance and Close-Out Procedures: NSCC said it will accept locked-in trade data from self-regulatory organizations ("SROs") and Qualified Special Representatives ("QSRs") during all designated market trading sessions within the new 24x5 window. To ensure orderly processing and reconciliation, sending entities must submit a "Good Night Message" to close out their trading activity for the Trade Processing Date. If an SRO or QSR fails to submit this message, NSCC retains the authority to issue a Good Night Message on their behalf. SROs and QSRs will be prohibited from submitting next-day trades before this close-out process is complete.
• Special Representative Relationships: NSCC said members wishing to participate in overnight trading sessions will be required to establish and maintain separate Special Representative and QSR relationships specifically designated for overnight activity. This requirement is designed to provide members with an additional control mechanism to manage their overnight trading exposures.
• Publication of Key Timeframes: To improve clarity and transparency, NSCC said it will replace existing rule text regarding time schedules with a requirement to publish a comprehensive schedule of key timeframes on its public website. This will include the operating hours of the UTC system, deadlines for accepting locked-in trades, and expected timelines for settlement cycles, trade reporting, and Required Fund Deposit calculations.

NSCC clarified that it is not currently proposing changes to its risk management rules or margin methodology. NSCC stated that its existing framework—including start-of-day margin calculations, the Margin Requirement Differential charge, and robust 15-minute intraday volatility monitoring—is adequately designed to handle the risks of overnight trading, which currently represents a small fraction of overall volume. However, NSCC noted that it will continue to monitor trading volumes and may propose further risk management enhancements before exchanges officially go live with 24x5 trading.

Subject to SEC approval, NSCC intends to implement the proposed rule changes on June 28, 2026.