The Democratic sweep of the House and Senate dominated headlines, pushing equity markets to record daily gains and energy markets to sharp losses, but grain markets showed limited reaction—at least for now. Corn rebounded from early lows to post a solid close higher while wheat finished mostly unchanged, though soybeans suffered under the weight of sharply lower energy prices, with bean oil falling to new six-month lows on concerns about shrinking biofuel margins.
Attention now turns to the next big test for grain markets: the USDA’s yield update scheduled for Tuesday, November 10. Large private estimates circulating ahead of the report carry bearish weight as harvest ends, with StoneX projecting corn yields at 183.1 bushels per acre and soybeans at 55 bushels per acre—figures that would represent significant jumps over previous record national yields and have already contributed to a collapse in bean prices over the past two months.
StoneX Raises Yield Estimates Ahead of USDA Report
StoneX released its yield estimates for the November USDA report late last week, raising its corn yield projection by 1 bushel per acre to 183.1 and lifting soybeans to 55 bushels per acre. Though StoneX had historically been considered a perma-bear on yields, its modeling has tracked closer to USDA figures than many firms since the pandemic. Harvest reports continue to show inconsistent but solid corn yields and better-than-expected bean yields, while super El Niño has proven far more beneficial than destructive to crops.
The speculative money crowd, which had built a record net long position, has unwound those positions over the last two months, turning solid gains into significant losses. With the trade having priced in yields around 176 for corn and 53 for beans just a month ago, the higher estimates have left the market in a defensive posture—too late to sell and too bearish to expect a quick recovery.
Brazil’s Election Adds Competitive Pressure
While Washington’s political shift grabbed headlines, a development in Brazil may prove more consequential for U.S. grain exporters. Brazilian markets sold off on October 26 after Luiz Inácio Lula da Silva’s runoff win secured him a fourth term, weakening the Brazilian real and making Brazilian farmers more willing sellers in dollar terms, according to Farm Progress. A weaker real means Brazilian farmers earn more in their own currency for every bushel sold in dollars, intensifying competition just as U.S. harvest pressure peaks.
Brazil is planting soybeans quickly, with planting reaching 42.8% complete ahead of the 40.2% average, and the 2026-27 crop is expected to hit a record 182 million metric tons. Brazilian sellers have already adjusted their pricing to account for higher supply, which will compete directly with U.S. beans in global markets as demand outside China remains uncertain. Weather forecasts call for 1.5 to 4 inches of rain across Brazil’s growing areas, though excess moisture remains a concern in the southern region.
Weather Easing Harvest Progress Shifts
Domestically, supply estimates paint a mixed picture. Advance Trading Inc. research holds 2026-27 U.S. soybean ending stocks at 316 million bushels, nearly in line with USDA’s 315 million-bushel estimate, but puts corn ending stocks at 2.087 billion bushels—well above USDA’s latest forecast of 1.849 billion bushels—largely due to a 180 million-bushel reduction in export forecasts as sales remain weak. USDA crop progress shows corn 60% harvested versus the five-year average of 66%, with good-to-excellent ratings holding at 56%.
Weather has provided some relief across the Midwest, with welcome rain replenishing soil moisture for the winter wheat crop while unseasonably warm temperatures have moved harvest along. Ethanol grind ran above the previous week and ethanol stocks fell, which should help push USDA’s estimate for corn used in ethanol above 5.6 billion bushels. A flash soybean sale to Spain was announced, but no sales to China were reported, and Thursday’s export report is not expected to deliver bullish surprises.
Diesel Prices Influence Late Harvest Expectations
The Democratic sweep is not expected to significantly alter agricultural policy or the already promised diesel and tariff checks. Once new members take office in January, they will sort out committee assignments and ranking Democrats, but the most noticeable market impact may come from diesel and gas prices if markets believe the war with Iran will end—though that relief at the pump arrives too late to help this year’s U.S. harvest.
More private yield estimates will emerge this week heading into the November 10 USDA update, but after StoneX’s projections, the consensus remains bearish. For grain markets, the election fallout has given way to a concrete test: whether the government’s official yield numbers will confirm the record crop sizes that private analysts are projecting, and whether prices can stabilize after two months of speculative unwind.
