You can trade Bonds from any of IBKR's trading platforms and allocate trades into your sub-accounts that have approved Bond trading permissions. If a sub-account does not have approved Bond trading permissions, the sub-account holder must first request and be approved for Bond trading permissions.
Can an Advisor trade Bonds for his clients?
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Can I trade ETFs through Interactive Brokers?
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Can I trade in my advisor account?
Can I transfer Asian corporate bonds held in other brokerage accounts into IBKR?