Update to TXSE Test Securities – Effective July 7

Dear Members,

This notice provides an update to the previously published TXSE Production Launch Schedule & Member Readiness – July 6–10.

Effective Tuesday, July 7, TXSE will add the following test securities:

• ZVZZT
• ZIEXT

These symbols are in addition to the five test securities currently trading on TXSE:

• CTEST
• NTEST
• ZVV
• ZBZX
• ZXZZT

As with the existing test securities, members should expect to receive reference data only for the securities actively trading on that day.

No other changes have been made to the previously communicated rollout schedule. Live trading in the previously announced securities will continue to commence on Friday, July 10, as scheduled.

If you have any questions, please contact the TXSE Operations team.

Sincerely,

TXSE Market Operations