What is Flash P&L, P&L sign-off?

The flash P&L is a desk’s estimate of the day’s P&L, produced shortly after the close from the trades captured by a cut-off time and the desk’s own end-of-day marks. The P&L sign-off is the daily approval of the final P&L by product control and the desk head, after independent price verification, fees and adjustments, with every exception explained and recorded.