The physical and financial shock of the US blockade is now a precise, imminent event. The move, announced Sunday evening, takes effect at 10 a.m. ET on Monday, April 13, 2026. It was triggered by the collapse of marathon peace talks in Islamabad, with President Trump declaring the U.S. Navy would "begin the process of BLOCKADING any and all ships trying to enter, or leave, the Strait of Hormuz."
The volume at stake is staggering. The blockade will disconnect roughly two million barrels of Iranian oil a day from global markets. This is a direct shutdown of Iran's entire current export capacity. For context, Iran exported 1.84 million barrels per day of crude in March, and has been shipping 1.71 million bpd so far in April. The blockade takes offline nearly the entire flow that was already elevated from pre-war levels.
The immediate market reaction confirms the scale of the shock. The price of US crude oil jumped 8 percent to $104.24 a barrel after the announcement, while Brent crude rose 7 percent to $102.29. This move up from the $90s represents a direct, dollar-for-dollar repricing of the lost supply, with the market pricing in a sudden, two-million-barrel-per-day deficit.
Market Response: Deficit, Prices, and Volatility
The market's quantitative reaction confirms a historic supply shock. Global oil supply collapsed by 10.1 million barrels per day in March, the largest disruption in history. This sets the stage for a dramatic forecast shift. The oil market is now expected to face an average supply deficit of 750,000 barrels per day this year, a massive reversal from last September's predicted surplus of 1.63 million bpd.
This deficit is already driving prices sharply higher. Following the blockade announcement, Brent crude prices surged past $103 a barrel. The physical market is pricing in scarcity, with spot benchmarks trading near $130 per barrel. Analysts have lifted their 2026 Brent forecasts by around 30% to $82.85 a barrel, marking the largest annual price forecast increase in Reuters poll records.
The volatility is extreme. The market is now in a state of acute physical tightness, with refining margins temporarily surging and middle distillate prices in Singapore hitting all-time highs. Yet, the outlook remains precarious. The forecast shows a steep deficit of around 3 million bpd in the second quarter, before a potential surplus returns by year-end. This creates a volatile setup where prices could swing dramatically based on the pace of supply restoration.
Catalysts and Risks: The Two-Week Countdown
The immediate diplomatic window is closing. President Trump's two-week ceasefire announced on April 7 creates a hard deadline for a resolution. The clock is ticking, and the market is watching for any sign of progress or breakdown. Until then, the blockade remains in effect, and the physical supply shock is locked in.
The primary risk is that this shock becomes permanent. ANZ warns that up to 2 million barrels per day of capacity could be lost. This isn't just a temporary disruption; it's a potential structural reduction in global supply. The market must now price in the possibility that a significant portion of Iran's export infrastructure is destroyed or rendered unusable, fundamentally altering the supply equation for years.
The effectiveness of the blockade hinges on illicit activity. Watch for Iran's 'Ghost Fleet' and attempts to reroute or sell oil clandestinely. UANI has tracked at least 34 Iranian oil loadings since the conflict began, with tankers using AIS spoofing and alternative routes like Omani waters. The scale of these operations-generating an estimated $3.5 billion in revenue for the IRGC-will determine whether the blockade achieves its full intended impact or if a significant portion of the two-million-barrel-per-day flow finds a way to the market.