FINRA Rule 3210 requires applicants associated with a member firm (Employer Members) to obtain the written consent of the Employer Member prior to opening an account with IBKR (Executing Member). The rule also requires persons to notify IBKR of their association with the Employer Member. IBKR may also be subject to similar non-US regulations.

Applicants employed by or affiliated with another broker or financial institution may be required to submit a document containing the contact information of their employer organization in order for IBKR to provide transaction data to the employer firm upon request. If the applicant is employed with a financial institution and no document is submitted, IBKR may contact the applicant in order to confirm that FINRA Rule 3210 does not apply.