ARA diesel stocks have shifted from inventory metric to supply constraint signal: Germany 72.1M bbl, Netherlands 19.3M bbl, Spain 39.3M bbl — total 130.7M bbl, 50.5% of their combined refined product stocks (258.8M bbl), far exceeding gasoline (43.4M bbl) or jet fuel (21.6M bbl) share. This isn’t about absolute volume — it’s structural: diesel dominates physical tank capacity, with no new tankage online. On supply: Dutch refinery input is 1,033 kb/d (JODI), yet diesel makes up 30.1% of its refined stocks, fuel oil 20.3%, while light ends (naphtha + gasoline) are just 22.0%. German refinery input is 1,490 kb/d, diesel stock share is 59.8%, fuel oil only 2.9% — confirming persistent mid-distillate bias and inflexible diesel blending capacity. Demand has no direct data, but DAX -1.92%, CAC40 -0.81%, and EUR/USD -0.66% signal weakening industrial diesel consumption — prolonging stock drawdown. ARA has degraded from ‘price stabilizer’ to ‘regional liquidity sieve’: Though Mandeb Strait AIS visibility drops to 13 ships/day (normal 17) and Bosporus to 16 (normal 24), crude arrivals to ARA refineries remain unimpeded (Gibraltar still ‘ok’), but cross-regional refined product movement is constricted — Dutch fuel oil stocks at 13.0M bbl (20.3% of total) cannot flow south efficiently as Spanish diesel stocks sit at 39.3M bbl (53.0% of total) and vessel scheduling deteriorates. This is physical hub structural blunting. Upside trigger: Brent > $101.50 + EUR/USD < 1.1050 → ARA diesel premium jumps above $12/bbl, opening arbitrage for traders. Downside trigger: German diesel stocks > 78.0M bbl OR Dutch total refined stocks > 68.0M bbl → confirms regional oversupply. View: bearish — ARA diesel is evolving from ‘inventory pressure’ to ‘liquidity trap’. Bearish on diesel crack spreads. Change to neutral if Brent holds > $100.20 AND EUR/USD sustains > 1.1180. Actionable for SNSUC clients: ① Lock EUR/CNY hedge now — EUR/CNY at 7.4371 (-0.57%) protects euro-denominated diesel imports; ② Pause new fuel oil vessel nominations to ARA — Dutch fuel oil stocks at 13.0M bbl (20.3% of total), tankage margin tightening; ③ Open diesel pricing window for Spanish buyers — 39.3M bbl diesel stock (53.0% of total) gives them peak quarterly negotiation leverage; ④ Monitor Gibraltar AIS traffic — if <35 ships/day for 3 consecutive days, activate alternative routing plan immediately.