Nasdaq Sets August 10 Start for Updated Trading-Halt Rules

Nasdaq said The Nasdaq Stock Market, Nasdaq Texas and Nasdaq PSX will make updated trading-halt rules operative on 10 August 2026.

The exchange operator said the changes come from coordinated work by Nasdaq exchanges and other self-regulatory organizations to establish common criteria and procedures for halting and resuming trading in equity securities when regulatory or operational issues arise. The alert says the amendments incorporate definitions and concepts from the amended Nasdaq UTP Plan and are designed to promote consistent, transparent treatment of events that may affect multiple exchanges.

Once operative, the updated rules clarify the situations that form the basis for a primary listing market to declare a regulatory halt. Nasdaq identifies three categories: halts provided by SIP plans, discretionary regulatory halts and mandatory regulatory halts.

The rules also set more detailed procedures for how a primary listing market initiates and resumes trading after a regulatory halt, and clarify what other exchanges must do in those circumstances. Nasdaq said the exchanges will still retain discretion in certain instances on whether and how to handle halts. The alert also says Nasdaq exchanges may impose an operational halt that applies only to that exchange’s own market.

Why it matters

Halt handling directly affects order routing, open risk and position exits. More consistent standards across listing markets and away markets should help traders understand when a halt is market-wide, when it is exchange-specific and how reopening responsibilities are divided.

What to watch next

Nasdaq listed a Saturday UAT production test opportunity for 8 August. Traders and broker technology teams should watch for matching alerts from other venues and any broker notices about order handling around halt reopenings.