An intercommodity spread is a futures spread in which long and short exposure is taken across two or more different, usually economically related commodity markets. Its purpose is to express or hedge a price relationship rather than the outright direction of a single market. This distinguishes it from a calendar spread, whose legs are different delivery months of the same futures contract.
The hedge ratio is part of the trade
The key variable is not merely which markets are paired, but how the legs are weighted. Contract sizes, quotation units, economic yields and price sensitivity can differ, so a one-for-one position may create a large unintended directional exposure. A usable spread therefore requires an explicit hedge ratio or common-unit conversion.
For a two-leg position that is long market A and short a weighted amount of market B, a reproducible representation is Spread_t = M_A × P_A,t − h × M_B × P_B,t. Here P is the quoted futures price, M is the factor needed to convert each quote into a comparable economic value, and h is the chosen hedge ratio. Depending on the markets, M can incorporate contract size, quotation-unit or currency conversion. Reversing the legs reverses the sign of the measured spread, so the sign convention must remain consistent when historical observations are compared.
Processing spreads make the importance of weighting especially clear: a soybean crush links soybeans with soybean meal and soybean oil, while a crack spread links crude oil with refined products. The ratio is intended to represent an economic relationship, not simply an equal number of contracts. CME Group’s facilitated soybean board crush, for example, uses 10 Soybean, 11 Soybean Meal and 9 Soybean Oil futures because a 1:1:1 construction does not properly reflect contract sizes and processing yields.
Relative-value risk is still market risk
A spread can widen or narrow even when both underlying prices rise, or when both fall; what matters is the movement of one leg relative to the weighted movement of the other legs. That makes intercommodity spreads useful for studying substitution, processing margins, cross-market dislocations and other relative-value relationships. It does not make them inherently market-neutral. The relationship can change because of inventories, seasonality, location, quality, currency, contract specifications, liquidity or a structural break in the underlying economics.
Execution and margin treatment are separate from the economic construction. Some exchanges list intercommodity spreads as multi-leg instruments, reducing the risk of filling one leg without the others. Clearing systems may also grant margin offsets between related products when portfolio risk is judged to be lower. Neither feature proves that the hedge ratio is correct or that the historical relationship will persist. For research, the leg definitions, contract months, units, conversion factors, ratio and spread-sign convention should therefore be recorded explicitly before comparing the spread through time.