OPEC crude production increased in July, with Gulf member states accounting for the bulk of the gains, according to a Bloomberg survey of output across the producer group.

The survey, the standard monthly tally Bloomberg compiles from ship-tracking data, producer statements and analyst estimates, points to a second consecutive month in which the Gulf core — Saudi Arabia, Iraq, the UAE and Kuwait — set the direction for the group's supply profile. The Bloomberg report identifies these Gulf nations as the leaders of the July increase.

The result lands at a delicate point in the group's supply management cycle. OPEC and its non-OPEC partners in the wider OPEC+ coalition have spent most of 2024 and 2025 unwinding the 2.2 million bpd layer of voluntary cuts that eight key members — Saudi Arabia, Russia, Iraq, the UAE, Kuwait, Kazakhstan, Algeria and Oman — first announced in November 2023 and began relaxing in April 2025.

For refiners and crude traders, the survey matters less as a precision instrument than as a directional signal. Monthly production surveys carry estimated error margins of several hundred thousand barrels per day, and individual country figures are frequently revised when official direct-communication data reaches the Joint Organizations Data Initiative. What the July tally does establish is that Gulf producers are continuing to lift supply in line with the group's staged quota increases, rather than holding barrels back.

The mechanics matter for term contract holders. Saudi Aramco sets its official selling prices for Asia, Europe and the US on expectations of just this kind of supply trajectory, and a sustained Gulf-led increase tends to pressure medium-sour differentials — with knock-on effects for complex refining margins in Asia and the Mediterranean that run on Middle Eastern crude slates.

The survey's framing — output up, Gulf nations leading — is consistent with the pattern analysts have tracked since the eight voluntary-cut members began restoring supply in monthly tranches. Saudi Arabia holds the largest unused capacity within the group, and the UAE carries a sanctioned quota baseline near 4.2 million bpd under its 2023 agreement, giving both room to raise output quickly. Iraq and Kazakhstan, by contrast, have spent much of the cycle compensating for earlier overproduction.

Investor attention now shifts to the group's next scheduled meeting. OPEC+ ministers are due to convene in early September to set policy for October, and delegates have signaled in recent weeks that the eight members will decide on another tranche of the unwinding at that session — a decision that will determine whether the July trend extends into the fourth quarter.

Price reaction to the survey has been measured, with Brent trading in a narrow band as the market weighs rising OPEC+ supply against seasonal demand and inventory draws. Analysts attribute the resilience to expectations that the incremental barrels will meet second-half demand growth rather than build stocks — a reading that remains contested among bulls and bears alike.

The watch items from here are three. First, the September OPEC+ meeting and the size of any October quota increase. Second, the OPEC secondary-sources report in the August Monthly Oil Market Report, which will put an official figure on July production and may confirm or temper the survey's finding. Third, the pace of Saudi OSP adjustments for October-loading cargoes, the earliest published read on how the Kingdom's marketing desk views the supply-demand balance heading into the winter demand season.