Portfolio contract, also known as arbitrage portfolio, refers to a contract in which a number of related commodities (mostly two) trade in different directions or the same commodity, and contracts in different directions are set in different months to facilitate arbitrage. There are also several types of portfolio contracts, such as SP contracts, that is, the same goods are combined in different months. For example, SPA1601&+0&; A 1605 is a combination contract of soybean 65438+ 10 and May contracts. Another example is SPC contracts, such as SPC A1601&; M 160 1 is a cross-commodity arbitrage combination of soybean 1 contract and soybean meal 1 contract.

In addition, some software vendors also offer self-defined arbitrage portfolios. But the difference is that the self-arbitrage portfolio is the operation of placing orders for two independent commodities separately, while the self-arbitrage portfolio of the exchange is the simultaneous ordering.