I just confirmed this MIG Bank – due to their bank status they will be able to accept US clients despite latest CFTC rules.
The situation is not very clear for all offshore brokers now but MIG Bank were the first to announce publicly that they will be accepting US clients at least until July 2011. Afterwards the decision will be reviewed according to new rules and/or information if it becomes available.
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For now, this only applies to self directed clients.