This risk caused the duo to take huge positions in the derivatives market, and was at the centre of an accounting scandal earlier this decade. (economist.com)
I remember reading somewhere that even passive tracking requires daily rebalancing (not huge position changes but tiny adjustments)- is this true for some index funds? (money.stackexchange.com)
In that case, they need a VIP account to get special service, large volumes and other necessary things for trading such huge positions. (fxempire.com)