Scope of Mock Trading Session on February 1^st, 2025 - PUMA Trading System

To assist participants in planning changes and implementations, a mock trading session of the PUMA Trading System will be held on February 1^st, 2025, with market participation.

In this session, the following system and infrastructure changes will be validated:

• Matching Engine Update - New Implied Functionality

Improvements in the Implied IN functionality of DI1 and DAP in the production environment.

The implementation will follow the plan below:

Additionally, we inform you of the activation of 2 new Implied IN contracts of DI1 in Feb/03/2025: DIIF27F28 and DIIF28F29.

• LiNe Portal Update:

A new Authorized Market column will be included when exporting the "Exchange Limit" report to the "TMOC/TMOV Instruments" and "SPCI/SPVI Instruments" tabs.

• Market Data: New Domains for Securities Lending Electronic Trading:

In Incremental(35=X) and Snapshot(35=W) messages, will be created of the domains for messages that have the 276 – QuoteCondition tag:

- Domain LM = BTB (Limited Order) and - Domain AN = BTB (All or Nothing Order)*.

*Functionality to be implemented later.

• Market Data: Settlement Price messages behavior change (269=6):

At present, when different types of settlement prices are available (tag 423) for a contract, both the settlement prices, by rate (PERCENTAGE) and per unit (PER_UNIT), are published in the same message. In the new format they will be published in two different messages, with no change to tags or domains.

1. Mock trading session timetable:

2. Morning test of the electronic trading system

It is mandatory for all the firms to participate in the morning test, which will be held on February 3^rd, 2025 (Monday), from 7:00 a.m. to 7:45 a.m. for the derivatives market and from 7:00 a.m. to 8:00 a.m. for the equities market in both production environments.

3. Participation confirmation:

The activities to be performed during the test can be found in the mandatory script. Market data for these instruments will be sent during the mock trading session.

Participation in the mock trading session must be confirmed no later than 12 noon on January 31^st, 2025 (Friday), exclusively by email at [email protected] with “Mock trading session” in the subject line, identifying the institution, naming the individuals who will participate and supplying their contact details (telephone numbers and email addresses).

In response to this confirmation, the participant will receive the mandatory test script and must fill it out and send it to the above email address.

Please note that mock trading session participants must adjust their internal systems so that the results of the mock trading session are completely segregated from real trading sessions.

Further information can be obtained from B3 Services – Trading, by telephone on +55 11 2565-5021/5022.