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I have used IB since they first opened. Since the 1st version of TWS. I would never trade anywhere else ( I hope!). But, with regard to these items. I have , on my basic watchlist page, a column for "unrealized p/l" and "daily p/l". I have not really spent the time to do a thorough study of these 2 things but, just from eyeballing the numbers in those columns everyday, they more often than not, seem incorrect. For example, a position that I KNOW is trading at a loss from where it was first put on, will show a positive p/l number ( and vice versa). I think the daily p/l of a position ( which I assume is the change from yesterday), seems to be make more sense. Just look into it and don't take it at face value until you get a better feel for it. It is possible that the problem may have it's roots in the fact that somewhere along the line, I made another ( most likely spread) trade that connected to my initial position and that is what is throwing the numbers off.

Classic TWS: Edit -> Global Configuration -> Market Data Columns -> Unrealized P&L% Once added, right click on it and choose between "Value", "Percentage" or "Both" Is this what you are looking for?