The realized gains/losses generated by all closed holdings during the reporting period based on the report's Beginning Market Value. For purchases made during the reporting period, the realized gain/loss is based on the cost basis of those purchases.
Calculation Notes:
Holdings purchased within the reporting period: Sell Amount - Buy Amount = Period Realized Gain/Loss.
Holdings purchased prior to the reporting period: Sell Amount - report Beginning Market Value = Period Realized Gain/Loss.