This industry comprises establishments primarily engaged in acting as agents (i.e., brokers) in buying or selling spot or future commodity contracts or options on a commission or transaction fee basis. Illustrative Examples: Commodity contracts brokerages Financial futures brokerages Commodity futures brokerages Cross-References. Establishments primarily engaged in-- ? Acting as principals in buying or selling spot or futures commodity contracts generally on a spread basis--are classified in Industry 523130, Commodity Contracts Dealing; and ? Buying and selling physical commodities for resale to other than the general public--are classified in Sector 42, Wholesale Trade.