Hi I'm trying to manage a long/short equity portfolio via pair trading. I would like to create a stop limit of 10% for the spread ratio. For example I want to deposit $500 in each position: long: lng $48.99 short: dssi $8.55 Current spread ratio = 5.73 Ratio at 5.15 =10.12% loss in the spread. I would therefore like my stop loss at 5.15 by limit order. I think the scale trader is the best way to manage this? Scaletrader and attach pair doesn't seem to offer this (seen below) https://www.interactivebrokers.com/en/software/tws/usersguidebook/algos/scaletrader_for_pairs.htm https://www.interactivebrokers.com/en/software/tws/usersguidebook/ordertypes/attach_a_pair_trade.htm If anyone could point me in the right direction I would be extremely grateful.