Money managers reduced their net-long position by 2.8% to 32,524 futures and options in the week ended Dec. 17, U.S. Commodity Futures Trading Commission data show. Short holdings climbed 1.2% to 75,199, within 6% of the record reached in July. Net-bullish holdings across 18 U.S.- traded commodities rose 8.5% to a seven-week high, led by soybeans, natural gas and cotton.