
Mexican President Claudia Sheinbaum signed a constitutional reform banning GM corn cultivation after a USMCA panel ruled against Mexico's 2023 decree. The government dropped three parts of the decree that limited GM corn imports but kept the cultivation ban and glyphosate phase-out.
Import restrictions were removed, so the direct effect on US corn exports is limited, but the cultivation ban keeps long-term uncertainty over Mexican demand for US GM corn.
After 439 past neutral policy events, Corn moved a median +0.1% over 5 sessions (51% higher; middle half -1.3% to +1.2%), and +1.1% over 20.
Moves of each commodity's benchmark from the last close before the event. Historical reads pool past events of the same kind; they describe what happened, not what will. Not investment advice.