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Technical Notice

FINRA TDDS 2.1 Nightly Replay Test Data File

October 19, 2022

As previously announced, FINRA is introducing changes to the current Trade Data Dissemination Service (TDDS 2.0). protocol and structure.1 These changes are being made in concert with FINRA’s technical infrastructure upgrade, and TDDS clients must accommodate them by December 5, 2022; as of that date the current TDDS 2.0 version will no longer be supported.  FINRA is offering testing for the changes in the test facility (NTF).

Beginning Monday, October 24, 2022, the TDDS 2.1 nightly test file replay will be disseminated. TDDS clients are invited to process the replay via the new Ports and IP Addresses.  The nightly test file is planned to be available from approximately 9:30 – 10:30 p.m. ET each weekday evening. The file data contents will be static and will only change periodically until the December 5, 2022 live date. 

TDDS clients with questions on the MOLD/UDP 64 protocol should contact Trading Services at 212.231.5180.

TDDS clients needing network assistance for setup for any of the above routes should contact [email protected].   

Please email FINRA Product Management or call (866) 899-2107 with questions regarding this notice.


1TRACE data feeds (ATDS, BTDS, BTDS-144A, SPDS, SPDS-144A) will convert to MOLD/UDP 64 and automated retransmission capability throughout 2023/2024.