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From Investopedia:   The S&P GSCI is a composite index of commodity sector returns which represents a broadly diversified, unleveraged, long-only position in commodity futures. The S&P GSCI is intended to provide exposure to broad-based commodities. The S&P GSCI was previously known as the Goldman Sachs Commodity Index (GSCI) but was purchased by Standard & Poor’s from Goldman Sachs in 2007.