Slower US harvest and Black Sea risk lifted grains early in the week, but a surprise jump in US corn production and stocks turned Friday sharply bearish and left corn as the clear underperformer.
Black Sea Region
Black Sea logistics remained the region’s most important market risk this week. Vessel incidents near Bulgaria and Romania increased the threat of higher insurance and freight costs, while Ukraine’s alternative rail, road and river corridors still cannot absorb the volumes normally moved by sea. Ukraine estimates that up to 35 MMT of agricultural products could remain blocked if disruptions persist, while the FAO expects global grain trade in 2026/27 to fall 3.5% to 505.8 MMT, partly because of Black Sea shipping restrictions and insufficient alternative transport capacity.
GLOBAL MARKET
US grain markets began the week with a constructive tone as weaker crop ratings, delayed harvesting and renewed Black Sea risk encouraged buying. That narrative strengthened on Tuesday, when corn, soybeans and wheat all rallied, but faded as improving harvest weather and expectations for Friday’s USDA update took over. The decisive move came at the end of the week, when a substantially larger US corn crop and higher stocks triggered a sharp selloff. Soybeans proved the most resilient major crop, while corn finished as the weakest performer.
Harvest Delays Drove the Early Rally
Lower US crop ratings and slower harvesting provided the main support during the first half of the week. Corn harvest reached only 23%, four percentage points behind average, while the crop rating fell to 54% good to excellent. Soybean harvest was just 25% complete, eight percentage points behind normal, with ratings easing to 57% good to excellent.
Those figures helped drive Tuesday’s strong advance, with Dec ’26 corn closing 10 3/4 cents higher at $5.08/bu and Nov ’26 soybeans gaining 22 1/4 cents to $13.03/bu. Wheat also rallied, with Dec ’26 Chicago up 12 cents to $7.04 1/4/bu.
The weather outlook then became less supportive. Mostly dry conditions across the central and western US were expected to allow harvest activity to recover, reducing the premium attached to the earlier delays.
Friday’s USDA Report Changed the Corn Narrative
The week’s dominant turning point was Friday’s USDA report. Instead of the lower corn yield and production expected by the market, USDA raised US yield to 181.2 bpa, up 2.7 bpa from September, and increased production by 234 million bushels to 16.034 billion bushels.
The balance sheet was equally bearish. US 2026/27 ending stocks jumped 282 million bushels to 1.849 billion bushels, around 179 million above market expectations, while global corn stocks increased 8.34 MMT to 280.44 MMT. Higher demand estimates softened only part of the supply increase.
Corn futures fell 19–21 cents in the front months on Friday, with December closing at $4.79 3/4/bu, down 18 cents for the week. Managed money had already been reducing exposure, cutting its net long by 60,491 contracts to 317,359 by October 6, mainly through long liquidation.
Soybeans Absorb Larger Crop Estimate
Soybeans faced their own bearish USDA adjustments, but the market response was considerably more resilient. USDA increased the US yield to a record 53.1 bpa and raised production by 27 million bushels to 4.562 billion bushels. Ending stocks rose to 315 million bushels, rather than declining as expected.
Demand remained an important counterweight. China was the leading buyer in the latest weekly export sales data, although total soybean sales of 549,377 MT were the lowest of the young marketing year and 40.25% below the same week last year. Earlier in the week, the market had also been supported by expectations for renewed Chinese buying after the Golden Week holiday.
Despite the larger crop and stocks, Nov ’26 soybeans recovered into Friday’s close at $12.92/bu, finishing 13 3/4 cents higher on the week. Soybean meal was also strong, with December gaining $18.10 for the week.
Black Sea Risk Supports Wheat, but Stocks Cap the Market
Wheat received early-week support from renewed Black Sea tensions, including attacks on vessels and port infrastructure, while US winter wheat planting remained behind normal. Russia’s export routes also stayed in focus as Baltic transit restrictions were discussed.
By Friday, however, the US balance sheet became the stronger influence. USDA raised 2026/27 US wheat ending stocks by 23 million bushels to 740 million bushels and cut exports by 25 million bushels. Global stocks were little changed at 276.04 MMT.
Speculative positioning also remained defensive. Managed money increased its Chicago wheat net short to 29,543 contracts, while the Kansas City net long was reduced to 24,040 contracts.
Export Demand Remains Uneven
US export performance was mixed across crops. Wheat sales of 451,562 MT were the second largest of the marketing year but still only around half the same week last year. Corn sales reached 769,468 MT, up from the previous week but 65.9% below last year, while soybean sales were 40.25% lower year on year.
The weak year-on-year pace in corn and soybeans limited the demand argument just as USDA increased supply estimates, reinforcing the bearish impact of Friday’s report.
Wheat Futures
Dec ’26 Chicago wheat closed Friday at $6.71/bu, down 12 1/4 cents on the day and 12 cents for the week. Dec ’26 Kansas City wheat lost 16 cents on the week, while Dec ’26 Minneapolis declined 2 3/4 cents. Higher US stocks and reduced export expectations outweighed support from Black Sea risk.
Corn Futures
Dec ’26 corn closed Friday at $4.79 3/4/bu, down 20 1/2 cents on the day and 18 cents for the week. The surprise increase in US yield, production and ending stocks made corn the week’s weakest major grain market.
Soybean Futures
Nov ’26 soybeans closed Friday at $12.92/bu, up 4 1/2 cents on the day and 13 3/4 cents for the week. Soybeans outperformed despite a record US yield and higher stocks, while continued Chinese demand and stronger soybean meal helped the complex absorb the bearish production revision.