Why Brent Crude Oil Prices Jumped on August 4, 2026

The Key Drivers on August 4, 2026

Renewed US Airstrikes Against Iranian Targets

After a brief hiatus, the US military resumed strikes on Iranian targets in late July. By August 4, the market was pricing in that a diplomatic resolution remained elusive . Iran had previously warned it would retaliate with "long and painful strikes" if attacks resumed .

Strait of Hormuz Remains Effectively Closed

Since March 4, 2026, Iranian forces have declared the Strait of Hormuz "closed," using drones, ballistic missiles, and small attack boats to threaten and attack vessels attempting to transit . The strait normally handles approximately 20% of global oil trade . Insurance is either unavailable or prohibitively expensive for vessels transiting the strait, and seafarers are unwilling to make the journey . As a result, Middle East oil production has been reduced by more than 11 million barrels per day (b/d) compared with pre-conflict levels . Attacks on tankers and energy assets have also severely complicated shipments from Saudi Arabia's west coast, which had emerged as a critical alternative route .

Structural Supply Deficit Persists

The International Energy Agency (IEA) has warned that the global oil market will remain "severely undersupplied" through the third quarter of 2026 . Global oil output is expected to fall by 3.9 million b/d for the full year 2026 . Gulf producers face cumulative supply losses exceeding 1 billion barrels . Even if hostilities were to end swiftly, the market is projected to stay in deficit through Q3 2026 .

Critically Low Global Crude Inventories

The US Energy Information Administration (EIA) warned that inventories in the largest economies are headed toward multi-decade lows not seen since at least 2003 . IEA Executive Director Fatih Birol stated that commercial oil reserves were depleting rapidly, with only weeks of supply remaining . Goldman Sachs estimated that global oil inventories were drawing at a record pace of 11-12 million b/d in April 2026 . The EIA projects that OECD oil reserves will fall to just below 2.3 billion barrels by December 2026 .

A Weakening US Dollar

A weaker US dollar was cited as an additional supportive factor for oil prices on August 4 . A declining dollar makes dollar-denominated commodities like oil cheaper for holders of other currencies, typically boosting demand and prices.

OPEC+ Maintaining Production Quotas

OPEC+ has kept its production quotas in place to support price stability amid extreme market volatility .

Unplanned Refinery Outages in Northern Europe

While less prominent in the immediate August 4 headlines, these outages add regional product tightness and support crude prices by increasing demand for replacement cargoes.

Broader Outlook for Oil Prices and Producer Profits

Oil Price Outlook

• Brent crude averaged around $106 per barrel in May-June 2026 before pulling back, according to the EIA .
• The EIA assumes that once Strait of Hormuz traffic gradually resumes, prices will moderate — but the timing is highly uncertain. Their baseline scenario sees Brent falling to an average of $89/bbl by Q4 2026 .
• The IEA sees the market undersupplied through Q3 2026, with a potential surplus emerging only in Q4 2026 or later if a durable ceasefire is reached .
• A durable resolution could unleash a significant supply glut in 2027, with the IEA predicting a robust rebound in global supply to 110.3 million b/d .

Producer Profits: Winners and Losers

• Winners: Oil producers with output outside the conflict zone — US shale, North Sea, West Africa, and the Americas — are capturing extremely wide margins as Brent remains well above breakeven costs.
• Losers: Middle Eastern producers face massive lost output and lost revenue. Saudi Arabia's west coast export capacity has been severely complicated by tanker attacks .
• Risk: The sustained deficit and low inventories mean that any further supply disruption (or renewed escalation) could drive Brent sharply higher, boosting profits for non-disrupted producers but also raising the risk of demand destruction .

Key Uncertainty

The single biggest variable is the trajectory of the US-Iran conflict. A ceasefire and reopening of the Strait of Hormuz would likely send Brent sharply lower as millions of barrels per day of shut-in production returns to the market. Renewed escalation — especially if it damages Saudi or other Gulf infrastructure — could push prices well above $100 per barrel again.