iShares S&P GSCI Commodity-Indexed Trust ( $GSG) Advances +12% Over 30 Days on Broad Commodity Strength (See the latest news for any ticker on Tickeron.) GSG climbed roughly 12% over the trailing 30 days, carrying the fund about 21% higher over the past three months. The fund tracks the S&P GSCI Total Return Index, a production-weighted basket of 24 commodity futures contracts dominated by energy. $DBC $DCMT $USCI $DJP $CMDT