A strike by about 360 Unifor port workers on the St. Lawrence Seaway began October 22 and halted shipping, with at least 100 ships on hold. Workers returned after a tentative agreement pending ratification, and business groups estimated losses near $900 million.
Grain from Western Canada moves east through the Seaway, so the closure delayed exports and tied up storage, pressuring Canadian grain basis and freight; with the strike resolved, the impact should fade.
After 284 past neutral logistics events, CORN moved a median -0.0% over 5 sessions (49% higher; middle half -1.3% to +1.4%), and -0.2% over 20.
After 163 past neutral logistics events, WHEAT moved a median +0.1% over 5 sessions (53% higher; middle half -1.3% to +1.1%), and -0.3% over 20.
Not enough comparable past events yet for a historical read.
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.