Actually I wonder if the Forex section of the “M2M perfromance summary” includes the FX translation of stock positions like Scorpion suggested. Otherwise the reconciliation of change in NAV in the “Net Asset Value” section of my activity statement would not make sense.
Below excerpt from help icon next to the M2M performance summary. A large value of Scorpion’s trades happened when USDCHF was a couple of % higher vs today so 1517 FX loss seems reasonable on 100k CHF assets.
Prob worth to contact IB to be sure
“Mark-to-Market Profit and Loss
Position: MTM profit and loss for each position. For Forex positions, this includes the FX Translation on cash balances and positions.”