How many friends can I refer to the Refer a Friend promotion?

There is not a limit to the number of friends you are able to refer to the Refer a Friend promotion but you are limited in receiving the flat fee Payment of USD 200 per eligible referral for up to fifteen (15) friends or family in a calendar year and thirty (30) total. 

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How does the Refer a Friend program work?
Does IBKR offer a Refer a Friend program?
Do you offer referral benefits?
Can I refer a family member to the Refer a Friend promotion?