Complex Positions is a term used to apply to combination orders having multiple legs. Examples include buy-writes (e.g. short call covered by long stock), Calendar spreads (e.g., long and short option position having same underlying, strike and type but different expiration dates) and various other option and/or option and stock positions. As Complex Positions tend to have all legs executed and managed collectively, IBKR allows these positions to be grouped and displayed on the TWS and activity statements as an aggregate position rather than individual legs.
Additional Information: