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System Status Messages

Time Market Status
11:07:35 ETNASDAQ
NTX
PSX		Nasdaq Testing for Trading Halt Rule changes is completed for today, Saturday August 8, 2026
09:37:00 ETNASDAQ
NTX
PSX

Market Data Reference

Market Center

Message Type

Details

UTP SIP

Market Center Trading Action (AK)

Trading Action Codes: H, T

Prop Feed

Operational Halt (h)

Halt Action Codes: H, T

Reference Documentation: DTN2018-3 - Operational Halt Messaging on Proprietary Feeds

Testing Timeline

Time

Market Center

Scenario

Validation / Notes

10:00 AM

Nasdaq

Operational Halt - All Tape C Securities

Open orders remain open;

Cancel requests permitted;

New orders rejected

10:20 AM

Nasdaq

Resume Tape C Trading

No auction occurs;

New orders accepted

10:00 AM

Nasdaq Texas (NTX)

Operational Halt - All securities across all tapes

Open orders remain open;

Cancel requests permitted;

New orders rejected

10:25 AM

Nasdaq Texas (NTX)

Resume Trading

New orders accepted

 

10:15 AM

Nasdaq

Operational Halt - Handful of Tape A & B

Securities

Symbols IBM, GE, TSM, VXX, CBOE

Open orders remain;

Cancel requests permitted;

New orders rejected

10:35 AM

Nasdaq

Resume Tape A & B Securities

New orders accepted

10:45 AM

UTP SIP

SIP Halt - Regulatory Halt (T6)

Symbols ZXZZT, ZJZZT and ZWZZT

Open orders remain open;

Cancel requests permitted;

New orders accepted

10:55 AM

UTP SIP

Regulatory Halt Resume

Halt Cross occurs; Trading resumes
    

Regulatory Messages

Time Market Status
19:15:53 ETNASDAQ
NTX
PSX
NASDAQ Options
NTX Options
NASDAQ Futures
ISE
GEMX
MRX		There are no messages available

IPO Messages

Time Market Status
19:15:53 ETNASDAQ
NTX
NASDAQ Options
NTX Options
PHLX
NASDAQ Futures
ISE
GEMX
MRX		There are no messages available

Self-Help Messages

Time Market Status
19:15:53 ETNASDAQ
NTX
PSX
NASDAQ Options
NASDAQ Futures
NTX Options
PHLX
ISE
GEMX
MRX		There are no messages available