Oil slides as OPEC+ hikes output amid post-war glut fears

Oil prices are tumbling as a wave of supply unleashed by the U.S.-Iran peace deal overwhelms global demand, eroding Tehran's ability to use the Strait of Hormuz as a bargaining chip even as stockpiles remain critically depleted. Brent crude has erased all its wartime gains and is trading near $70 a barrel, while the physical market flashes signs of weakness more extreme than any period since the Covid demand collapse of 2020, according to Bloomberg.finance.yahoo+1

The sudden shift was compounded over the weekend when seven OPEC+ members, led by Saudi Arabia and Russia, agreed to raise collective oil production by 188,000 barrels per day beginning in August — the third consecutive monthly increase since the Middle East conflict began in February.worldoil+1

Depleted Reserves Meet Returning Supply

The International Energy Agency's June Oil Market Report found that OECD government inventories fell by 163 million barrels between March and May to their lowest level since December 1990, driven by emergency drawdowns to compensate for barrels lost during the conflict. The U.S. Energy Information Administration warned that total OECD oil inventories are on track to fall below 2.3 billion barrels by year-end — the lowest in agency records dating to 2003.reuters+1

Yet the rapid recovery of flows through the Strait of Hormuz has outpaced expectations. A U.S. official told Bloomberg that commercial shipping through the waterway surged above 10 million barrels per day in late June with American military support, catching Tehran "off guard" and underscoring its now-limited ability to halt traffic. Vice President JD Vance framed the memorandum of understanding signed with Iran in mid-June as designed to let the world refill oil stocks before reassessing Tehran's position, describing it as a strategy to "refill global oil supplies and then see where the hand is".bloomberg+2

Bearish Forecasts Pile Up

Wall Street is turning decisively bearish. Citigroup ↘ 5.04% warned on July 3 that Brent could extend declines to $60 a barrel by year-end as the Hormuz shock fades, recommending clients "sell any summer rallies". Macquarie slashed its 2026 Brent forecast to $77 a barrel on average and cut its 2027 outlook to $64. JPMorgan ↘ 4.19% now projects Brent averaging $86 in the third quarter before falling to $80 in the fourth quarter and exiting the year at $78. Goldman Sachs ↘ 6.36% and Morgan Stanley ↘ 5.94% have also warned the market faces a glut heading into next year.thestreet+4

JPMorgan's Natasha Kaneva has said the system can replenish at a pace of only 30 to 45 million barrels per month, suggesting OECD nations face months before storage normalizes. The EIA does not expect traffic through the strait to return to pre-conflict levels until early 2027.instituteforenergyresearch+1

The Leverage Equation

The paradox is stark: inventories remain at historic lows, yet a flood of returning barrels — combined with OPEC+ output hikes totaling 940,000 barrels per day since the war began — has shifted the market's psychology toward surplus. For Iran, the implication is that its primary source of leverage during negotiations may already be slipping away as the world's crude arteries reopen faster than its negotiators anticipated.icis+1