Nasdaq UTP Plans Enhanced Symbol Directory for Extended Hours

Nasdaq Trader says the UTP SIP will introduce a new Enhanced Symbol Directory Message to support several planned market-data changes later in 2026.

The alert says the new message will be disseminated alongside the existing symbol directory message and will include additional fields requested by the UTP Operating Committee and the industry. Those fields include a new issue indicator, ETP indicator, minimum price increment tick value, trading state, halt reason and Reg SHO action.

Two changes stand out for active equity traders and data users. Beginning 2 November, the Nasdaq listing market is expected to provide minimum price increment values tied to SEC tick-size changes. Beginning 6 December, the industry has agreed to operate the UTP SIP on a 23-hour, five-day schedule, from Sunday evening through Friday evening with a planned daily maintenance window.

The notice is technical, but the downstream impact is practical. Brokers, data vendors and trading tools will need to process the new directory message correctly so symbols, halt states and tick-size constraints display accurately.

Why it matters

Extended-hours data operations and tick-size metadata both affect execution workflows. Traders using scanners, automated order checks or venue-specific data feeds may depend on symbol-directory fields to avoid rejected orders or misread halted securities.

The enhanced message also gives vendors a route to expose more status information without relying on separate reference-data processes.

What to watch next

Watch vendor certification, specification updates and the first production readiness dates ahead of November and December. Platform release notes should state whether the new UTP fields are supported before the changes go live.