Scope of the Simulated Trading Session – PUMA Trading System (September 27, 2025)

To support participants in planning changes and implementations, a simulated trading session of the PUMA Trading System will be held on September 27, 2025, with market participation. The following system changes will be validated during this session:

System Changes to Be Validated

1. New Network Testing

We are proceding with Phase 2 of New Network project, focusing on the Binary Market Data for Equities as planned and previously announced.

During Phase 2, all clients will continue to access the old network while B3 transitions all its servers from the old to the new access network. In this phase, the new network will not be available for testing in the simulation environment; it will only be accessible during the October mocks. This means that, from the client's perspective, there will be no changes during Phase 2.

Simulated Trading Session Schedule

Morning Test of the Electronic Trading System

All brokerage firms are required to participate in the morning test on September 29, 2025 (Monday):

• Derivatives: 7:00 AM to 7:45 AM
• Equities: 7:00 AM to 8:00 AM
• Environment: Production

Participation Confirmation

Confirmation must be sent by 12:00 PM on September 26, 2025 (Friday), exclusively via email to [email protected], with the subject “Simulated Trading Session”, including:

• Institution identification
• List of participants with names, phone numbers, and email addresses

Upon confirmation, the test script will be sent and must be completed and returned to the same email address.

For further clarification, contact: +55 11 2565-5021 / 5022

Access to the Support Material prior to the Simulated Trading Session is essential for proper participation.