Update to Production Auction Deployment

Dear Member,

This notice updates the implementation schedule for TXSE auction functionality previously described in trader alert TXSE-2026-013 .

Auction functionality will not be implemented in the TXSE production environment on Monday, July 27, 2026. A revised production date for auction functionality will be announced in a future alert.

TXSE is participating in the previously scheduled industry test on Saturday, July 25, 2026, during which opening and closing auction functionality will be exercised in the designated TXSE test symbols.

We strongly encourage all firms to continue testing auction functionality in the TXSE UAT environment and to review the latest technical specifications for auction-related messages across all TXSE protocols to ensure readiness for production deployment.

If you have any questions, please contact marketops@txse.com.

Sincerely,

TXSE Market Operations