Updated Hours for June 29, 2026 Production Test

Dear TXSE Member,

As we continue final preparations for launch with designated test securities on July 6 and select NMS securities on July 10, TXSE is providing updated details regarding the previously announced Production Test scheduled for Monday, June 29, 2026.

To provide participants with additional testing opportunities ahead of launch, TXSE is extending the test session to support a full trading day schedule.

This production validation test follows TXSE's final industry-wide weekend test on June 27 and provides an additional opportunity for firms to verify readiness prior to launch.

Please RSVP before Friday, June, 26 at 12:00 ET by contacting marketops@txse.com.

1. TEST SCHEDULE (ET)

• Pre-Market Session: 8:00 AM – 9:30 AM
• Regular Trading Session: 9:30 AM – 4:00 PM
• Post-Market Session: 4:00 PM – 5:00 PM

2. TEST PARAMETERS

The June 29 Production Test is intended to support participant operational readiness in the TXSE production environment.

Participants should note the following:

• TXSE will not publish to the SIPs during this test session.
• Trading will be limited to test symbols only.
• Participants will operate in test mode only.
• As a result, participants should expect to receive reference data containing only test symbols during the test session.
• No production-listed securities will be available for trading.
• Participants are encouraged to validate connectivity, order entry, execution processing, market data consumption, reference data handling, and downstream operational workflows.

If you have questions or require assistance, please contact marketops@txse.com.

We look forward to working with you.

Sincerely, TXSE Market Operations