SPDR S&P Global Natural Resources ETF(AMEX:GNR)

GNR offers exposure to global natural resources companies including those engaged in commodities businesses. The fund equally-weights S&P's three natural resources subindexes to evenly split weight between the metals & mining, agriculture, and energy sectors. Eligible securities will be ranked according to market cap and the top 30 companies from each subindex will be included for a total of 90 index constituents. These stocks must be listed on a developed market exchange. Selected securities will then be weighted by market-cap within each buckets, subject to constraints such that US stocks are capped at 40% and emerging market stocks are capped at 15%. In addition, no individual security must have a weight greater than 5%. The index rebalancing occurs annually.