The 18 August note argued that the exposed position in this trade was the short, not the currency: leveraged funds were running their most crowded Euro FX short in three years while the pair held a 20-day high. That falsifier had two branches. A deepening short with the pair holding its ground would leave the crowding unchallenged. A shrinking short would signal the squeeze had already begun. The fresh data settles it toward the first branch. The Euro FX net short widened by 4,622 contracts in the week to 11 August, the report itself dated 11 August 2026, and it now sits at 0.9 on the concentration index, the most stretched since 28 July. On the 52-week Williams COT index it reads 12.5, near the bottom of its annual range for a net-short book: this short has rarely been bigger over the past year. The three-year percentile, 2.6, and z-score, negative 2.25, say the same thing from a longer lens. This crowding has essentially no precedent in the recent record.
That the pair keeps rising while the short keeps growing is the read that matters. A short built against a currency near its 20-day high is not a position collecting carry quietly. It is a position accumulating unrealized losses every session the pair holds above 1.1369, this window's low. The commercial side, asset managers and dealers, sits net long at 35,651 contracts against that leveraged short, an unusually wide split for a market this large: open interest of 916,178 contracts. If EUR/USD extends further, the leveraged side is the cohort structurally positioned to absorb the pain, and short-covering into a rising pair tends to accelerate the move it was meant to bet against.
The euro's leveraged short is now a bet on the dollar reversing that the dollar's own tape is not yet supporting.
The macro backdrop gives the short less cover than a simple dollar-weakness story would suggest. Fed funds futures price the front rate at 3.725% as of 21 August, with the 12-month implied rate at 4.015%, a positive 29 basis point delta: a firmer, no-cuts path, not an easing one. The 6-month delta, plus 17 basis points, points the same direction. That is a modest drift, plausibly term premium rather than an aggressive tightening signal, but it runs opposite to the backdrop a crowded euro short usually wants: dollar softness with a dovish Fed underneath it. Instead the 2-year Treasury yield sits at the 91.7th percentile of its own trailing year, a z-score of 1.58, and the 10-year at the 94th percentile, both consistent with a market still pricing a Fed reluctant to ease, even as the dollar index itself sits low, at just the 21st percentile of its year, a z-score of negative 0.88. The dollar's softness and the rates market's firmness are not telling the same story. The euro short is caught between them.
One month of positioning data is a narrow base for calling the crowding decisive, and the broad dollar index's own weak percentile argues there is a genuine macro case for further euro strength that has nothing to do with this specific short being wrong on timing. What the desk is watching next is the following CFTC report. If the Euro FX net short begins to shrink while EUR/USD holds above its current 20-day high, that is short-covering meeting a currency that already won the argument, and the squeeze this desk has been flagging since 18 August moves from a risk to a fact on the tape.
