Scope of the Simulated Trading Session – PUMA Trading System (August 23, 2025)

To support participants in planning changes and implementations, a simulated trading session of the PUMA Trading System will be held on August 23, 2025, with market participation. The following system changes will be validated during this session:

System Changes to Be Validated

1. New Network Testing

Participants will be allowed to conduct tests related to the new co-location and trading network project. These tests may be performed in two ways:

1.1 Test Sessions Requested via Atende B3

Use of test instruments as per the table below:

1.2 Production Sessions with Real Instruments

Related to engines EQT02 and DRV06, as follows:

• Order Entry Binário – Gateways: 10001, 10002, 20001 e 20002
• Order Entry FIX – Gateways: OE001 a OE008 e OE121 a OE128
• Market Data: Binário e FIX

The list of instruments and their respective Binary Market Data channels is available in the attachment:

• Channel 82 – Equities
• Channel 78 – Derivatives

The simulated environment has been available since July 15, 2025, for connectivity validation on weekdays, and will remain accessible until August 22, 2025.

Support Contact Centers

UMDF Binary – Order Book Management by Price / Priority

Starting August 25, 2025, the first tranche of position publication deactivation will begin, with the MDEntryPositionNo field being reset to zero (“0”).

This deactivation marks the final stage of the Order Book Management by Price / OrderID in Binary Market Data, which was launched in production in May 2025.

In addition to the channels in the first tranche, two additional channels (72 and 82) will also be available for validation.

Testing of Implied IN Functionality for Structured FRA Operations of DI1 (DIF) and DAP (DAF)

Update in the Calculation of TMOC and TMOV Metrics for Option Offers in the LINE Trading System

Our LINE Trading risk management system will begin using a new calculation method for the TMOC and TMOV metrics (Maximum Buy and Sell Offer Size) for option offers. The implementation is being carried out in two phases:

• Since July 21, 2025, the new model has been in effect for Equity Options;
• Starting August 25, 2025, it will also apply to Derivative Options.

The new model can be found in External Announcement 036/2025-VNC, issued on July 15, 2025.

Simulated Trading Session Schedule

Morning Test of the Electronic Trading System

All brokerage firms are required to participate in the morning test on August 25, 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 August 22, 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.