Production Testing Opportunity: Thursday, June 18, 2026

Dear TXSE Member,

Based on requests from member firms and as part of TXSE's ongoing launch readiness activities, TXSE is pleased to offer an additional production testing opportunity on Thursday, June 18, 2026, from 12:00 PM ET to 5:00 PM ET to support production connectivity validation and operational readiness testing.

Key Details

1. Production connectivity will be available from 12:00 PM ET to 5:00 PM ET.
2. All participant sessions will operate in test mode only.
3. Participants connecting at 12:00 PM ET will enter the Regular Trading Session and will transition to the After Hours Trading Session at 4:00 PM ET.
4. Participants may use this opportunity to establish and validate connectivity to the TXSE production environment, verify session configurations, and confirm operational readiness.

RSVP Required

Firms wishing to participate are requested to RSVP to marketops@txse.com no later than Wednesday, June 17, 2026, at 12:00 PM ET.

Please include the following information in your response:

• Firm name
• Primary contact name and email address
• Scope of your testing

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

We look forward to working with you.