Seven OPEC+ members — Saudi Arabia, Russia, Iraq, Kuwait, Kazakhstan, Algeria, and Oman — adjusted production and reaffirmed their commitment to market stability on July 5, 2026, stepping into a market that has swung from acute supply shock to incipient glut in the span of weeks.

From Glut to Shock to Glut Again

The whiplash is worth mapping precisely. Heading into 2026, the IEA's January Oil Market Report projected world supply rising 2.5 mb/d to 108.7 mb/d for the year — a comfortable, even uncomfortable, surplus. By October 2025, the agency was already flagging an untenable surplus of nearly 4 mb/d driven by surging Middle Eastern and American volumes. That consensus evaporated fast.

The U.S.-Israeli war with Iran choked the Strait of Hormuz. The near-total closure halted roughly 20% of global LNG flows, according to Reuters, and carved a supply shock into what had been a buyer's market. By May 2026, President Trump had imposed a blockade of Iranian ports to press Tehran toward negotiations, Reuters reported. The IEA's May report revised 2026 global supply down to 102.2 mb/d — a projected decline of 3.9 mb/d year-on-year, a complete inversion of the pre-war forecast.

A U.S.-Iran deal to end the fighting was signed around June 17, 2026, per AP News, reopening the strait and pausing sanctions pressure. The IEA's June report kept the 2026 supply decline estimate at 3.9 mb/d but nudged the absolute level up slightly to 102.4 mb/d, then projected an 8 mb/d rebound to 110.3 mb/d in 2027 — a number that prices the full resumption of Hormuz-dependent flows back into the market.

The Fragility Underneath

The deal is holding the strait open. Whether it holds the peace is less certain. Reuters reported on July 1 that 60-day U.S.-Iran talks are underway but a durable settlement remains in doubt, with tit-for-tat attacks continuing. Al Jazeera's analysis on July 2 asked directly whether reopening the strait had already converted the supply shortage into a glut — a reasonable question given how quickly the pre-war surplus had reasserted itself whenever Hormuz friction eased.

That fragility is the operative context for today's OPEC+ move. The group is managing a market where the supply curve can shift by several mb/d depending on whether a ceasefire holds or fractures. The Brookings Institution's June 8 analysis of the chokepoint-to-crisis sequence captures the structural problem: roughly 20% of globally traded oil transits Hormuz, which means any resumption of hostilities doesn't just tighten one regional market — it reprices crude globally within days.

OPEC+'s Constrained Options

OPEC's own demand-side numbers add another layer. The most recently dated MOMR figures project global oil demand growth of 1.0 mb/d in 2026 year-over-year, with OECD demand contributing roughly 0.1 mb/d of that — meaning non-OECD economies carry almost all the incremental growth. If the IEA's 2027 supply rebound of 8 mb/d materialises while demand grows at only 1 mb/d annually, the arithmetic points back toward the surplus conditions that preceded the war.

That's the bind OPEC+ is navigating. Cutting too aggressively while Hormuz is open cedes market share; cutting too little risks accelerating the glut that was already building before the conflict began. The group's July 5 statement on market stability is, in effect, a holding pattern — a signal of intent without yet committing to a specific output trajectory into a second half of 2026 that remains contingent on geopolitics rather than fundamentals.

The IEA's swing from a +2.5 mb/d supply growth forecast in January to a −3.9 mb/d outcome projection by June captures what happened to this market in less than six months. Supply forecasts that tidy — nearly 6.4 mb/d of net revision inside a single year — are a reminder that any 2027 projection carrying the same confidence interval deserves proportionate skepticism. The strait is open. The deal is fragile. The numbers will move again.