To assist participants in planning changes and implementations, a mock trading session of the PUMA Trading System will be held on November 23^rd, 2024, with market participation.

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

• New Implied Functionality

During this mock trading session, the new Implied functionality will be enabled for testing and will be disabled at the end of the session. On December 9^th, 2024, the Implied functionality will be launched in the production environment.

To allow ePUMA screen users to test the Implied, this application version must be updated to v.7.8.14.4.

This functionality will allow the interaction of offers from the individual books of a product (outrights) with offers from the structured operations books (EDS) of the same product.

The Implied IN functionality will be available, which consists of generating synthetic offers (offers that replicate the effects of an offer) in the EDS books from two offers in the outrights books, for the DV01 Neutral Structured Operations of DI1 (DII) and DAP (DAI).

• DDI/DOL EDS

During this mock trading session, instruments will be registered to test DDI/DOL EDSs. The instruments will be unregistered at the end of the session. On December 2^nd, 2024, the DDI/DOL EDSs will be launched in the production environment.

Currently, when executing some strategies via Forward Rate Agreement on ID X U.S. Dollar Spread (FRC), investors are left with redundant positions at the first maturity of U.S. Dollar Futures and ID x U.S. Dollar Spread Futures.

The DDI/DOL EDS and DDI/WDO EDS will allow investors to zero their redundant positions efficiently and quickly, thus eliminating operational and maintenance costs for these positions.

• Update of the Binary Market Data Template File

The Market Data template file will be updated to version 1.9.0.

The update to the new version of the template file will not be mandatory, as it is backward compatible with the previous version, but it will be required for the use of the new implied functionality.

In the production environment, Binary Market Data publications will be based on “Schema version” 10.

The updates of the documents Binary UMDF – Message Reference v1.9.0, Binary UMDF – Messaging Specification Guidelines v1.9.0, and b3-market-data-messages v1.9.0 are available for consultation at www.b3.com.br under Solutions, Platforms, Puma Trading System, UMDF Binary.

The implementation waves are detailed at: clientes.b3.com, Posts, News, B3 Tech Lauches | Trading

• LiNe Trading – Optimization of Risk Engines

Implementation of the new version of Risk Engines with a 5% reduction in latency at the 50th percentile and outliers.

The implementation waves are detailed at: clientes.b3.com, Posts, News, B3 Tech Lauches | Trading

• Matching Engine and Binary Gateway Update

Implementation of the new version containing the new field ReceivedTime.

The value of the Binary Gateway Timestamp will be reflected in the ReceivedTime tag, considering the implementation waves detailed at: clientes.b3.com, Posts, News, B3 Tech Lauches | Trading

• Matching Engine Update - SelfTradePreventionInstruction tag

Change in the behavior of the SelfTradePreventionInstruction tag in Binary Order Entry: for those who wish to exclusively use the Mass Cancel on Behalf functionality, the domain NONE will be updated for the submission of RLP, MOC, MOA, and LOC orders. This removes the need to submit the field with a Null value for these orders. Other behaviors not mentioned have not been altered.

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 November 25^th, 2024 (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 November 22^nd, 2024 (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.