Fundos Oil e Gaz cotados?

A pesquisar nas bolsas dos EUA por tickets relacionados com oil e gaz descobri estes dois que segundo dizem são fundos cotados em bolsa cuja cotação reflecte os contratos futuros dass respectivas materias.
OIL - iPath S&P GSCI Crude Oil Tot Ret Idx ETN
The investment is linked to the performance of the Goldman Sachs Crude Oil Return Index and reflects the returns that are potentially available through an unleveraged investment in the futures contacts comprising the index plus the Treasury Bill rate of interest that could be earned on funds committed to the trading of the underlying contracts. The index is derived from the West Texas Intermediate (WTI) crude oil futures contract traded on the New York Mercantile Exchange. The fund is nondiversified.
GAZ - iPath DJ AIG Natural Gas TR Sub-Idx ETN
The investment seeks results that correspond generally to the price and yield performance, before fees and expenses, of the sub-index of the Dow Jones-AIG Commodity index. The fund is designed to reflect the performance of natural gas. The index is composed of the Henry Hub Natural Gas futures contract traded on the New York Mercantile Exchange.
OIL - iPath S&P GSCI Crude Oil Tot Ret Idx ETN
The investment is linked to the performance of the Goldman Sachs Crude Oil Return Index and reflects the returns that are potentially available through an unleveraged investment in the futures contacts comprising the index plus the Treasury Bill rate of interest that could be earned on funds committed to the trading of the underlying contracts. The index is derived from the West Texas Intermediate (WTI) crude oil futures contract traded on the New York Mercantile Exchange. The fund is nondiversified.
GAZ - iPath DJ AIG Natural Gas TR Sub-Idx ETN
The investment seeks results that correspond generally to the price and yield performance, before fees and expenses, of the sub-index of the Dow Jones-AIG Commodity index. The fund is designed to reflect the performance of natural gas. The index is composed of the Henry Hub Natural Gas futures contract traded on the New York Mercantile Exchange.