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M. Firm Designated ID
This topic includes information related to the Firm Designated ID (“FDID”) and use cases.
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F. Representative Orders
G. Manual Orders
H. ATS
I. Foreign Securities
J. OTC Equity Securities
K. Options
L. Equity Floor Brokers
M. Firm Designated ID
N. Third Party Reporting
O. Technical Requirements
P. Feedback and Error Correction
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05/08/2026
FAQ
M13.
Does a Firm Designated ID apply to a trading account or to a Customer? Certain provisions in the CAT NMS Plan refer to Firm Designated IDs for Customers.
Topics
M. Firm Designated ID
05/08/2026
FAQ
M12.
Where can I find additional information regarding the Firm Designated Identifier (FDID)?
Topics
M. Firm Designated ID
05/08/2026
FAQ
M11.
Is the use of a Relationship ID to populate the FDID if the account structure is not available at the time of order receipt limited to only institutions?
Topics
M. Firm Designated ID
05/05/2026
FAQ
M17.
This FAQ has been retired and archived. Please refer to FAQ M1.
Topics
M. Firm Designated ID
05/05/2026
FAQ
M7.
This FAQ has been retired and archived. Please refer to FAQ M1.
Topics
M. Firm Designated ID
05/05/2026
FAQ
M2.
Is it permissible to use information that can be used to identify a customer, trading account or relationship as the firmDesignatedID value, or as part of the firmDesignatedID value, when submitting data to the Transaction system or the Reference Database?
Topics
M. Firm Designated ID
05/05/2026
FAQ
M3.
This FAQ has been retired and archived. Please refer to FAQ M1.
Topics
M. Firm Designated ID
05/05/2026
FAQ
M1.
What are the circumstances under which a firmDesignatedID value representing a single, unique account, relationship or entity identifier can change over time?
Topics
M. Firm Designated ID
05/05/2026
FAQ
M6.
If an Industry Member uses multiple reporting vendors for both Transaction system and Reference Database reporting, must each vendor use the same firmDesignatedID value representing a single, unique account, relationship or entity identifier when reporting to CAT?
Topics
M. Firm Designated ID
05/05/2026
FAQ
M10.
This FAQ has been retired and archived. Please refer to FAQ M2.
Topics
M. Firm Designated ID
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