Is my account with Prometheum ATS or with somewhere else? 25 October 2022 18:36 Updated Your trading account is with Prometheum ATS. Your custodial account is with your custodian. Related articles Is Prometheum ATS registered? How do market orders work? What can I trade with Prometheum ATS? Why do you need so much information to open an account? How do I open an account?