It would be great if you add another column showing the percent of PL earned on closed positions. This would eliminate the need to do unnecessary calculations manually after closing the positions.
Most of the platforms miss this point, that we want to see historical ROI as a %. Have had given this request a long time back but then everybody forgot about it.
It is difficult to show the P&L percentage for closed positions because we need a starting reference to calculate the percentage. In this case, we need to know if the trade was long or short, but closed positions don’t give this information. On top of that, these closed positions could be a result of multiple trades that may not be connected to each other, making it even harder to calculate.
Let’s take an example, you first buy the stock at 100 & then sell it at 500.
P&L = (Sell Price - Buy Price)
P&L = 500-100 = 400
Now same prices, but we will initiate the trade from short. You first sell the stock at 500 & then buy it at 100. (assuming the margin required is constant)
P&L = (Sell Price - Buy Price)
P&L = 500-100 = 400
See, same prices, same P&L but different P&L percentage.
Infact, this calculation will not stand correct in the real world, as the margin requirements are different when you initiate trades from short side. And %P&L theoretically should be on the capital deployed.