For example, Trader A bought 1 Iron Ore Swap Sep 09 contract and sold 1 Half-day CTC Sep 09 contract.
Maintenance margins for Iron Ore Swap Sep 09 = 2,500; Maintenance margins for Half-day CTC Sep 09 = 5,250; Inter-commodity spread credit = 0.25; Delta Spread Ratio = 1 CM v 1 FE
Previous maintenance margin requirements = 5, 250 + 2,500 = US$7,750
With inter-commodity spread credit,
New maintenance margin requirements = 7,750 – (0.25*5,250*1) – (0.25*2,500*1)
= US$5,812.50 |