Interactive Brokers requires margin of $40,000 per contract for short sales in CFE Bitcoin futures. Margin on long positions of CFE Bitcoin futures is currently

Interactive Brokers requires margin of $40,000 per contract for short sales in CFE Bitcoin futures. Margin on long positions of CFE Bitcoin futures is currently $9,000. “The introduction of short sales was necessitated by the large premium of the January futures contract over the price at which Bitcoin trades on the physical venues,” said Interactive Brokers founder, Chairman and CEO Thomas Peterffy.