To assist participants in planning changes and implementations, a mock trading session of the PUMA Trading System will be held on 02/24/2024, with market participation.
In this session, the following system and infrastructure changes will be validated:

•    Market Data Binary template update:
We inform you that the second maintenance release of Market Data Binary will be implemented, including the update of the template file, for channels 68, 70, 80 and 98 and the respective changes as described in the statement 118-2023-VNC-External Communication released on November 23, 2023.

•    Market Data FIX (UMDFTCP and ePUMA):
Validation of Market Data FIX being produced through Market Data Binary, specifically for the following channels 1, 2, 3, 4, 5, 6, 9, 10, 11, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 65, 66, 67, 68, 69, 70.
 
At the end of the simulated session, the functionality will be rolled back. In other words, starting from next Monday (02/26/2024), the version of Market Data Fix will be restored to the one used in the trading session of 02/23/2024.

Additional details about the implementation can be found in External Communication 122/2023-VNC 122 (b3.com.br) and in the Customer Impact Document (CID) titled "UMDF FIXFAST and Conflated – Platform Update." This document can be accessed at https://www.b3.com.br, in the Solutions section, Platforms, Puma Trading System, for developers and vendors, Market Data FIX/FAST, UMDF, and UMDF Conflated.

•    Change in cancellations of orders when there is a corporate event: Implementation of change in the behavior for cancellations of orders when there is a corporate event on Friday. Cancellations will be received on Monday and no longer on Friday, as it works currently.

•    FIX Gateway Version Update: 
Currently, FIX trading gateways receive messages in FIX format. However, with the update we will implement in the simulated trading session, FIX gateways will receive messages in binary format. Subsequently, they will convert these messages to the FIX protocol and send them to clients, ensuring that there is no impact or alteration to the FIX protocol.

•    Implementation of the new methodology for the reference price of BDRs:
Starting from 02/26/2024, in the case of registered transactions with BDR NP or ETF BDR on B3 during the closing call, the reference price will correspond to the last transaction within that interval (closing call price), provided that the total volume traded during the closing call for the instrument has reached the value of R$100,000.00.

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 26, 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 February 23, 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.