Databento
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Sorry - Every trading account has a unique tag 50 no matter the account structure. Can you elaborate?
My bad, I should've been clearer.
I'm referring to when the user obtains Firm Admin Dashboard access and then gets permitted by the FCM to create iLink session IDs associated with the FCM and/or Tag 50 operator IDs by themselves.
More trivially, CME treats any user that obtains a dedicated iLink as an ATS operator, regardless of entity structure. However there are more nuanced steps along the way of simply gaining FADB access or registering a new Tag 50 with FADB where a user might become classified as an ATS operator unknowingly.
All this is usually abstracted away from a retail trader but are parts of the typical administrative process for setting up a low latency environment on CME.