Three materials make up this small family: corn, sweetcorn and soy, all three with an index. As of 4 November 2026 they average +1.7% over three months, with two up and one down, and +4.7% over a year. Both moves trail the vegetables group as a whole, which gained 4.1% over three months and 8.3% over the year.
Soy accounts for most of the rise, up 8.3% over three months and 19.4% over a year, the strongest material in the family on both horizons. Yet late-October notes describe softer prices. On 26 October, soybeans were down on Matif and CBOT, and Chicago soybeans hit a two-month low under pressure from harvest-related selling.
Two days later, Brazilian soybean prices fell as Chicago futures weighed, and US prices dipped on an unexpectedly large harvest. These reports cover the last weeks of October, not the whole three-month window, so they sit beside the index move rather than explain it.
Corn is the family's only decliner: -3.5% over three months and -6.9% over a year. Corn prices fell on the Chicago and Paris exchanges on 4 October, after a sharp drop in Paris alongside wheat and rapeseed on 29 September, and the United States closed its campaign on 1 October with markedly more corn in storage.
Not every origin followed: Polish corn reached its highest price in three years on 2 October, driven by limited domestic supply. Sweetcorn barely moved, +0.2% over three months and +1.7% over a year. On 26 October, Huercasa inaugurated a new sweetcorn processing plant in Sanchonuño, Segovia, described as Europe's largest and already running, which raises output for the leading European supplier of sweetcorn cobs.