Chicago wheat surged past $6.12 on Black Sea drone strikes and Southern Midwest rains before the formal signing of a US-Iran ceasefire on Thursday erased the gains, while corn flipped to a net short fund position for the first time in months and soybeans absorbed the largest single-week speculative liquidation on record.

The truncated four-day trading week of June 15–18 packed an entire month's worth of volatility into a single Wednesday rally and Thursday reversal, bookended by a Monday session still digesting the prior week's record fund selling and a holiday-shortened Friday close for Juneteenth. Wheat was the week's defining story — climbing from four-month lows early in the week to a two-week high mid-week before surrendering most of those gains once the geopolitical catalyst behind the rally was formally resolved. Corn spent the week establishing fresh contract lows even as its export fundamentals remained the strongest in the complex, while soybeans were whipsawed between a record NOPA crush miss, a string of fresh Chinese purchases, and a collapsing crush margin that fell nearly $1.25 per bushel from its earlier-month peak.

A Record Fund Short Becomes the Defining Structural Force

The week opened with the agricultural complex still absorbing the shock of the prior Friday's CFTC data, which had shown the largest single-week speculative selling on record across the Ag space, reducing the net long position to its smallest level in four months. Money managers entered Monday having flipped corn to a net short of roughly 5,000 contracts after selling more than 120,000 contracts in the most recent reporting period — a complete reversal from a net long above 115,000 contracts just weeks earlier. In Chicago wheat, funds extended their net short to 74,000 contracts through additional selling of 48,000 contracts across the three wheat classes. Soybeans saw the most extreme single-week move of all: money managers sold nearly 165,000 contracts across the soybean complex, the largest weekly liquidation ever recorded, cutting the net long to 275,000 contracts. This extreme positioning set the stage for the violence of Wednesday's reversal — a market this lopsided needed only a credible catalyst to trigger aggressive short covering, and it received one mid-week.

Monday: New Contract Lows in Corn, Four-Month Lows in Wheat as Iran Peace News Hits Energy

Monday's session opened under heavy pressure from a collapse in energy prices to two-month lows after President Trump stated a peace deal with Iran was "now complete," with Pakistan's prime minister confirming an official signing ceremony would take place in Switzerland on Friday. Spot WTI crude fell $4.25 to near $80.60, dragging the entire grain complex lower in early trade. July and December corn both established new contract lows at $4.08¼ and $4.36 respectively, while CGO and MIAX July wheat fell to four-month lows. Despite the early weakness, all three crops staged a partial recovery into the close — Chicago wheat finished up 5¼ cents at $5.89¾ on support from a 27% good/excellent winter wheat condition reading (up 2 percentage points) and a harvest pace of 25% complete, well ahead of the 13% average. Corn closed up 2¾ cents at $4.15½ despite NASS showing corn conditions improving 1 point to 68% good/excellent. Soybeans rallied 5¾ cents to close at $11.19¼ even after a NOPA report showed May crush of just 208.785 million bushels — well below trade expectations and near the low end of estimates — alongside soybean oil stocks of 1.735 billion pounds, a sharp 10.9% draw from April.

Wednesday: A Record Short Position Meets Black Sea Drone Strikes and Relentless Rain

Wednesday was the week's pivotal session and the moment the record speculative short was finally tested. Heavy and continuing rains across the Gulf coast and central Midwest threatened the quality of the SRW crop and delayed early harvest at the precise moment funds were carrying a roughly 72,000-contract net short in Chicago wheat. The trigger arrived in two parts: overnight drone attacks were reported on Novorossiysk, Russia's primary deep-water Black Sea grain export terminal, reintroducing Black Sea logistics risk into a market already pricing in the lowest US winter wheat production in 50 years; and confirmation that Algeria had purchased an estimated 800,000 to 850,000 MT of milling wheat, signalling that import demand remained price-inelastic even after the recent rally. Chicago SRW July surged 16¾ cents to close at $6.12¾, its first sustained close above $6.00 in weeks, with KC HRW July gaining 18¾ cents to $6.52½ and MPLS adding 13¼ cents to $6.25½. All three wheat classes closed near session highs, with technical resistance at their respective 50-day moving averages — $6.17¾ for Chicago and $6.62¼ for KC — now within reach for the first time since the record fund selling began three weeks earlier. Corn rallied in sympathy, gaining 7¼ cents to $4.21, while soybeans saw a more conflicted session: a USDA flash sale of 372,000 MT to unknown destinations drove July and November beans to two-week highs intraday before both contracts faded 6 to 8 cents to close with only marginal gains, as soy oil fell to a seven-week low and crush margins were hit for another 17 cents to $3.25½/bu.

Thursday: The Iran-US MOU is Signed, and Wednesday's Rally Unwinds in a Single Session

Thursday delivered the formal resolution that the market had been anticipating since Monday: President Trump signed a 14-point memorandum of understanding with Iran at a state dinner in France, establishing a 60-day ceasefire that opens the Strait of Hormuz in exchange for the US lifting its blockade on Iranian ports, with the 60-day window intended to allow negotiation of a permanent agreement. The effect on wheat was immediate and one-directional. Coming into Thursday, speculative traders had been net buyers of Chicago wheat for four consecutive sessions, trimming the net short toward 65,000 contracts — but Thursday reversed that trend decisively, with funds clearly back in a selling mood. CGO July fell 10¼ cents to close at $6.02½ after peaking precisely at its 50-day moving average of $6.18¼ in early trade, a textbook technical rejection. KC HRW July dropped 11 to 12 cents, consolidating between its 50- and 100-day moving averages without breaking higher, while MPLS fell 5 to 6 cents after an early attempt at a two-week high also failed. Algeria's purchase from earlier in the week was confirmed at $264 to $265/MT CF, sourced from the Black Sea and EU rather than the US — a pointed reminder that US wheat remains less price-competitive than its main rivals even with the domestic supply story intact. Corn and soybeans also retreated on the broader energy-driven de-risking, with corn down 5½ cents to $4.15½ and soybeans down 9¾ cents to $11.22¼, even as soybeans recorded a 12-week high in old crop export sales and back-to-back days of fresh Chinese purchases.

Corn's Export Fundamentals Remained the Strongest in the Complex All Week

Throughout the four sessions, corn's underlying demand picture continued to diverge sharply from its price action. Weekly export inspections of 1.636 MMT in the week of June 11 were down from the prior week but still left marketing-year shipments 26.01% above the same period last year. By Thursday, weekly export sales of 1.157 MMT marked a four-week high and were 28% above year-ago levels, with notable purchases from Japan, Mexico, and Spain, while a flash sale of 285,775 MT to Mexico was also confirmed. Old crop commitments reached 3.304 billion bushels, up 26% year-over-year against a USDA forecast of only a 16% increase, representing 99% of the USDA projection versus a 93% historical average. New crop commitments of 4.643 MMT marked a four-year high, up 41% from the same point last year. US corn acres in drought fell to a nine-month low of 23%, reinforcing that the underlying crop remains in strong shape even as the futures market searched for direction amid the broader fund-driven volatility.

Soybeans: A Demand Recovery Undercut by Collapsing Crush Economics

Soybeans presented the week's most internally conflicted picture. On the demand side, the news flow improved steadily: Wednesday's 372,000 MT flash sale was followed Thursday by two more purchases totalling 252,000 MT, including 132,000 MT directly to China, while weekly export sales of 424,869 MT marked a 12-week high and new crop commitments reached a three-year high of 49 million bushels, up 12% year-over-year. Yet the physical processing side of the market told an opposite story. NOPA's May crush figure of 208.785 million bushels missed trade expectations badly, and crush margins fell from $3.60½/bu on Monday to $3.06½/bu by Thursday — a decline of over 50 cents across just four sessions and nearly $1.25 below the month's earlier peak. Soy oil bore the brunt of the deterioration, falling to a seven-week low by Wednesday and continuing to slide into Thursday despite finding technical support near its 100-day moving average. The structural arithmetic facing US soybean exporters remained daunting throughout the week: with US Gulf FOB offers only marginally competitive with Brazil and ANEC raising its Brazilian June export forecast to a record 15.3 MMT, traders noted that reaching the often-discussed 25 MMT target for US sales to China ahead of Brazil's next harvest would require weekly bookings averaging nearly 1 MMT — a pace nowhere close to being achieved even after the week's improved sales flow.

Weather Remained the Wedge Issue Separating Wheat from Corn and Soybeans

The same precipitation pattern that pressured SRW wheat quality throughout the week was simultaneously beneficial for corn and soybean development. NASS data released Monday showed 95% of the winter wheat crop headed and harvest at 25% complete nationally — far ahead of the 13% five-year average — but the acceleration reflected the crop's historically poor development rather than favourable conditions, and the Gulf coast and central Midwest rains that intensified by Wednesday and continued into Thursday's NOAA forecast directly threatened the quality of grain still in the field. For corn and soybeans, the same Western Corn Belt and I-states rainfall pattern was constructive: corn conditions held at 68% good/excellent with emergence on pace, soybean plantings reached 95% by Tuesday's reading, and both crops showed no weather-related risk premium building into their respective price action. This divergence — rain as a quality threat for one crop and a developmental benefit for two others — was a consistent undercurrent across all four sessions.

Wheat

Jul '26 CBOT SRW wheat closed the four-day week at $6.02½, up 12¾ cents from the prior Friday's close of $5.89¾, though the path was anything but linear — the contract touched a four-month low of $5.75½ on Monday before surging to a two-week high of $6.12¾ on Wednesday and retreating Thursday as the Iran-US MOU removed the geopolitical premium. KC HRW July gained 27 cents on the week to close at $6.40-area levels after Wednesday's peak of $6.52½, while MPLS spring wheat finished little changed after its own round trip from $6.10 to $6.25½ and back. The week's dominant themes were the historic speculative short — which oscillated between 74,000 contracts on Monday and a four-session low near 65,000 by Wednesday before funds resumed selling Thursday — and the destructive Gulf coast and Midwest rainfall pattern threatening SRW harvest quality just as Algeria's confirmed purchase of 800,000 to 850,000 MT was routed entirely to Black Sea and EU origin rather than the US.

Corn

Jul '26 CBOT corn closed the week at $4.15½, down slightly from the prior Friday's $4.17½, after a volatile path that included a new contract low of $4.08¼ on Monday and a rally to $4.21 on Wednesday before fading back to $4.15½ by Thursday. December followed a similar pattern, touching a new contract low of $4.36 before recovering. The week's defining structural development was the CFTC confirmation that money managers had flipped to a net short position for the first time in months, the product of unprecedented two-week liquidation. Despite the price weakness, corn's export fundamentals were unambiguously the strongest in the complex all week — marketing-year shipments running 26% above year-ago levels, a four-week high in weekly sales by Thursday, new crop commitments at a four-year high, and drought-affected acreage falling to a nine-month low of 23%.

Soybeans

Jul '26 CBOT soybeans closed the week at $11.22¼, up 3 cents from the prior Friday's close of $11.19¼, having traded as low as $11.07½ on Monday before climbing to $11.32 on Wednesday and settling back by Thursday's close. November followed a comparable arc. The week's central tension was between improving export demand — highlighted by a string of flash sales to China and unknown destinations totalling over 600,000 MT across Wednesday and Thursday, plus a 12-week high in weekly old crop sales — and a sharply deteriorating processing margin environment, with crush falling from $3.60½/bu Monday to $3.06½/bu by Thursday and soy oil sliding to a seven-week low. NOPA's disappointing May crush figure of 208.785 million bushels set the bearish tone early in the week, while ANEC's record Brazilian June export estimate of 15.3 MMT kept competitive pressure on US Gulf offers through the close.