TXSE Auctions - Production Test Schedule

Dear Member,

As part of our targeted September 16 launch of Primary Listings, TXSE will conduct additional Saturday production industry tests. The upcoming test schedule is provided below:

• August 8, 2026
• August 15, 2026
• August 22, 2026
• August 29, 2026
• September 12, 2026

Members can expect the following TXSE test symbols to be included in the reference data distributed for each production industry test:

• ZZZTT
• ZZZTE
• ZZZTX
• ZZZTA
• ZZZTS

In addition to these production industry tests, auction functionality is available for testing each day in the TXSE UAT environment, enabling members to validate auction workflows across all supported TXSE protocols. Members are encouraged to review the technical specifications, available on the TXSE website, and continue UAT testing in advance of production availability. TXSE will communicate the planned production implementation date in a future Trader Alert.

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

Sincerely,

TXSE Market Operations