US corn and soyabeans prices fell sharply at the end of September after a USDA report showed larger-than-expected corn stocks, sources indicated on 1 October 2026. The decline in Chicago Board of Trade futures fed through to physical markets, with independent assessments showing notable markdowns for New Orleans delivery.
Platts assessed October CIF New Orleans corn at $222.75 per tonne on 30 September, a fall of $7.95 per tonne from the previous assessment. That assessment was published alongside reporting that US corn outright prices fell sharply on 30 September in line with the CBOT moves and the USDA Grains Stocks surprise.
The USDA Grains Stocks report released at the same time showed higher corn stocks than market expectations, a development that the reports item cited as the proximate trigger for the price moves. Market commentary in the report linked the higher stocks figure to the sharp short-term reaction in both futures and cash markets.
Soyabeans were also reported to have fallen sharply, according to reports headline, although the item did not publish comparable physical-assessment figures for soyabeans in the same way as for corn. The headline and accompanying text framed both grains as moving down on the same fundamental surprise from the USDA.
Trading on the Chicago Board of Trade set the tone for the moves recorded in physical assessments, the report said. The CBOT declines over the session on 30 September were reflected in the FOB and CIF price assessments used by traders and analysts for New Orleans delivery.
Platts assessments
Platts provided the numerical assessment cited in the report, showing the October CIF New Orleans corn price at $222.75/mt on 30 September and the change of $7.95/mt from its prior assessment. The figure was presented in the reports piece as the clearest indicator of how the futures weakness had translated into the Gulf Coast physical market.
The report did not publish the full series of Platts numbers for all nearby delivery months in the text supplied for verification, but it singled out the October CIF New Orleans assessment and its decline as the key assessed change on 30 September.
USDA report and market reaction
The USDA Grains Stocks data was the causative detail highlighted in the reports coverage. That government report showed corn inventories above what markets had priced in, and the higher-than-expected stocks reading was cited directly as the reason Chicago Board of Trade futures and US cash prices reacted sharply lower on 30 September.
reports tied the futures moves and the Platts assessment together to show how an unexpectedly large stocks print can transmit from official statistics to futures and then to assessed physical prices for a major delivery point such as New Orleans.
Key details from the reports item include:
- Date of report publication: 1 October 2026.
- Platts assessment cited: October CIF New Orleans corn at $222.75/mt on 30 September.
- Change noted: down $7.95/mt from the previous Platts assessment.
The article in reports presented these points as the factual basis for its headline that US corn and soyabeans prices fell sharply after the USDA stocks surprise. It linked the USDA data release, the CBOT futures moves and the Platts physical assessment as the sequence explaining the price adjustments observed on 30 September.
The immediate price reaction documented in the report illustrates how official supply figures and exchange-traded futures moves can feed directly into Gulf Coast physical assessments. reports supplied the assessment details for one nearby delivery month and the date of the market response, enabling a clear snapshot of market sensitivity to the USDA stocks surprise.
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