OPEC crude supply rose in June as Persian Gulf producers began unwinding the deeper voluntary cuts that have anchored the alliance's market management through 2025, according to a Reuters production survey.

The survey, which tracks physical flows from the 12 OPEC members, registered an aggregate month-on-month increase as Saudi Arabia, the United Arab Emirates, Kuwait and Iraq moved to restore barrels withheld under a layered voluntary cut programme. Gulf producers carry the bulk of those volumes, which is why they lead the rollback.

How does the Reuters survey differ from the OPEC secretariat numbers?

Reuters compiles its monthly OPEC production tracker from shipping intelligence, company filings, refinery intake data, and direct communication with national oil companies and traders familiar with loading programmes.

The methodology captures physical barrels moving through terminals, not the production quotas OPEC publishes in its Monthly Oil Market Report. That gap is why a Reuters survey reading can diverge from the headline allocations.

The June print is the first full month in which the unwind was visible at the loading terminal, in refinery receipts, and in ship-tracking exports. Compliance with the deeper voluntary layer had run high through the first quarter; the second quarter was the transition window.

Why the Gulf is moving first

The voluntary cut framework was structured so that the deeper, time-bound reductions sat with the four Gulf partners and a small group of other members. The unwinding logic mirrors the build-up: the same members that bore the cuts now lead the restoration.

• Saudi Arabia retains the largest unused production capacity in the group and has historically acted as the swing supplier.
• The UAE has consistently run near its quota ceiling, which constrains how fast it can ramp.
• Kuwait, with longer commissioning cycles on its heavier crudes, has tended to add supply in measured steps.

Iraq's profile is more complicated. Baghdad has separately committed to compensate for past over-production through a schedule of incremental cuts, and the interaction between that compensation plan and the voluntary-cut unwind will shape how much real incremental supply reaches the spot market in the second half of the year.

What is the demand-side backdrop?

Brent has traded in a defined range through the second quarter. OPEC+ officials have pointed to demand growth in Asia and the resilience of the northern-hemisphere summer driving season as justification for a measured unwind rather than a sudden release.

The Reuters survey lands at a moment when traders are parsing alliance communiqués for a date stamp on the next tranche of supply. The Saudi Energy Ministry has framed the gradual approach as risk management designed to restore barrels without overwhelming a market still absorbing additions from producers outside the group. That posture has anchored expectations of a phased rather than instantaneous rollback.

What the watch list looks like

• The next scheduled OPEC+ ministerial meeting, where the alliance typically confirms the next increment of the voluntary-cut unwind.
• Saudi Aramco's monthly official selling price notification, treated as a real-time read on Saudi confidence in Asian demand.
• July and August loadings from Persian Gulf terminals, which will show whether the June pace accelerates or stalls.
• Compliance telemetry from the Reuters and S&P Global Commodity Insights surveys, which can flag members producing above their revised targets.
• Monthly demand indicators from China, India and the United States, which determine whether incremental OPEC+ barrels clear at current price levels.

The June survey is the first data point, not the verdict. The unwind accelerates or stalls depending on July and August flows, and the next OPEC+ communiqué will set the floor under that decision.