A system comprises a memory operable to store market data. The system further comprises a processor communicatively coupled to the memory and operable to buy a plurality of index futures. The plurality of index futures are held as long positions in a trust, and a particular index future is publicly traded on a commodity exchange. The processor is further operable to issue a plurality of trust receipts associated with the trust, wherein the plurality of trust receipts are publicly traded on at least one security exchange. The processor is further operable to post a margin with a futures commission merchant (FCM), wherein the margin is based at least in part on the plurality of index futures and the FCM makes at least one interest payment associated with the plurality of index futures.