‘Day Open’ price is the previous day’s close price for positions held overnight, and the trade price for positions opened on the current business day. It is the price used to calculate the P&L you are making on the current business day.
Example of “Day Open” price calculation on a consolidated CFD account
Customer A did 3 USDJPY trades on Day 1 and market closed at 110.70:
• Trade 1: Buy 200,000 USDJPY @ 110.50
• Trade 2: Buy 100,000 USDJPY @ 110.40
• Trade 3: Sell 100,000 USDJPY @ 110.60
As your positions are closed on a FIFO basis, Trade 3 would close out 100,000 USDJPY of Trade 1, therefore the “Day Open” price would be 110.45 [(100,000 x 110.50) + (100,000 x 110.40)]/200,000.
On Day 2, Customer A will see the open position of USDJPY being rolled over, with the "Day Open" price indicated as 110.70.