Warrants, structured products and certificates cannot be sold short nor bought on margin at IBKR.
Can I short a warrant, structured product or certificate?
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What is the margin requirement for shorting stocks?
What trading permissions do I need to trade warrants, structured products and certificates?
How does short selling work on Interactive Brokers, and how can I check stock availability for short selling?
Is there a limit on the number of stocks I can short?