OPEC+ is the alliance of OPEC’s 11 members and 10 non-OPEC producers — led by Russia — that has coordinated oil output under the Declaration of Cooperation since December 2016. Members’ quotas are negotiated at ministerial meetings, monitored every two months against independent data, and enforced through peer pressure and compensation schedules. Together the group controls roughly 40% of world supply.
That’s the brochure version. The working reality in mid-2026 is messier and far more interesting: the UAE walked out of the organization on May 1, the Strait of Hormuz crisis has made a mockery of the quota table, Kazakhstan still hasn’t met a target it liked, and the group’s production decisions remain — war or no war — the single most important scheduled event risk in crude. How the cartel actually moves prices is the subject of our pillar guide to how OPEC controls oil prices; this article covers the machinery underneath: who is in the club, how the quota numbers get made, and how compliance is measured, fudged and traded.
What OPEC+ actually is
Start with the distinction people blur. OPEC proper is the Vienna-based intergovernmental organization founded at the Baghdad Conference in September 1960 by five countries — Saudi Arabia, Iran, Iraq, Kuwait and Venezuela — to wrest pricing power from the Western majors that then ran the industry. It has a charter, a secretariat, a secretary-general and formal membership.
OPEC+ is not an organization at all. It is a coordination framework — the Declaration of Cooperation (DoC) signed in December 2016 — under which OPEC and ten non-OPEC producers agreed to manage output jointly after the 2014–2016 price collapse demonstrated that OPEC alone no longer controlled enough barrels to balance the market against US shale. The DoC’s first act cut about 1.8 million b/d of combined supply starting January 2017. It worked well enough that the “temporary” arrangement is now in its tenth year.
The distinction matters practically: Russia sits at the OPEC+ table and co-chairs its key committee, but it is not an OPEC member, pays no dues and is bound by nothing except its own calculation of self-interest. The same is true of every “+” country. OPEC+ discipline is diplomacy, not law — which is exactly why compliance data moves markets.
Who’s in the club: members and quotas in 2026
OPEC’s membership has been shrinking. Qatar left in January 2019 to focus on LNG, Ecuador quit in January 2020, Angola walked in January 2024 after a quota dispute, and on April 28, 2026 the United Arab Emirates — a member since 1967 and the group’s second-biggest producer — announced its exit from both OPEC and OPEC+, effective May 1. That leaves 11 OPEC members:
| OPEC member | Joined | Notes for traders |
|---|---|---|
| Saudi Arabia | 1960 (founder) | Swing producer; holds most of the world’s spare capacity |
| Iraq | 1960 (founder) | Second-largest OPEC producer; serial over-producer under compensation plans |
| Iran | 1960 (founder) | Sanctioned; exempt from quotas; at the center of the 2026 Hormuz crisis |
| Kuwait | 1960 (founder) | Core Gulf producer, reliable quota-taker |
| Venezuela | 1960 (founder) | Sanctioned; exempt from quotas; output a fraction of its 1990s peak |
| Libya | 1962 | Exempt from quotas owing to chronic instability |
| Algeria | 1969 | Quota-taker in the voluntary-cut group |
| Nigeria | 1971 | Largest African producer; baseline disputes led Angola to quit |
| Gabon | 1975 (rejoined 2016) | Small producer, ~200,000 b/d scale |
| Equatorial Guinea | 2017 | Smallest member by output |
| Republic of the Congo | 2018 | Small producer, ~270,000 b/d scale |
The “+” side of the ledger adds ten countries: Russia, Kazakhstan, Azerbaijan, Oman, Bahrain, Brunei, Malaysia, Mexico, Sudan and South Sudan. In practice the heavy lifting is done by a much smaller subset — Russia, Kazakhstan and Oman on the non-OPEC side — while Mexico stopped participating in the cut rounds after 2020 and several others produce too little for their quotas to matter. Add it up and OPEC alone accounts for roughly 30% of global supply; the full OPEC+ group, around 40%. That share, not any single member’s output, is the source of the group’s pricing power — and it is the number the UAE just subtracted from.
The UAE earthquake
The UAE’s departure is the biggest rupture in OPEC’s history since its founding — bigger than Qatar’s exit, because Abu Dhabi was not a marginal member. ADNOC’s production capacity is around 4.8 million b/d and rising, with a stated target of 5 million b/d by 2027, and alongside Saudi Arabia the UAE held the only meaningful spare capacity in the group. Its frustration was structural and long-running: OPEC+ baselines kept Emirati output well below capacity for years (the dispute nearly blew up the alliance publicly in mid-2021), which meant Abu Dhabi was paying for market stability with idle barrels while expanding capacity it wasn’t allowed to use.
The official language cited “national interests” and flexibility to respond to market demand. The subtext, well covered by regional analysts, includes divergence from Riyadh on regional politics and a calculation that in a wartime market short of Gulf barrels, an unconstrained UAE earns more than a quota-bound one. Whatever the weighting, the trading consequences are concrete: the group lost its second-largest producer, its most credible growth story and a chunk of its spare capacity buffer, and every future OPEC+ cut now has to be deeper per remaining member to deliver the same market impact. It also sets a precedent every stretched member noticed — the door works.
What to watch from here: ADNOC’s actual production ramp (secondary-source estimates will now track the UAE as a free agent, the way they track US shale), and the fortunes of Murban — Abu Dhabi’s light crude, which has traded as a futures contract on ICE Futures Abu Dhabi since 2021. An unconstrained UAE selling rising volumes of exchange-priced crude is, in effect, auditioning Murban for a bigger role in the benchmark hierarchy. It would not be the first time a producer left a pricing club and took a benchmark with it.
Why members leave — and what departures signal
Five producers have walked away in a decade, and the reasons form a pattern worth understanding, because exits are one of the few honest signals a cartel emits.
- Indonesia (suspended 2016). Became a net oil importer; a consumer has no business in a producers’ cartel. Its brief 2016 return lasted months before the cut agreements made membership absurd.
- Qatar (January 2019). A small crude producer but an LNG superpower, Doha concluded its future was gas — where OPEC has no writ — and left with its regional rivalry with Riyadh simmering in the background.
- Ecuador (January 2020). Fiscal desperation. Quito needed every export dollar and could not afford to cap output for the collective good. Small producers bear cuts disproportionately: the barrels they give up are material to them and immaterial to the market.
- Angola (January 2024). The baseline war made explicit. When the 2024 quotas cut Angola’s reference level to match its declining capacity, Luanda refused the arithmetic and left. Its production kept declining anyway — which was rather the secretariat’s point.
- UAE (May 2026). The opposite case: a producer leaving not because it was shrinking but because it was growing. Angola left because its quota flattered it; Abu Dhabi left because its quota constrained it.
The signal in every case: countries stay in OPEC+ while the value of coordination exceeds the value of autonomy, and not a minute longer. Small decliners leave when cuts become unaffordable; large growers leave when cuts become opportunity cost. The members most likely to stay forever are the ones in the middle — too big to ignore quotas, too slow-growing to resent them. That, more than any communiqué language about unity, is the actuarial table of cartel membership.
How quotas actually get set
The quota machinery has three moving parts, and knowing which body does what saves you from misreading headlines:
- The ministerial meetings (OPEC and non-OPEC Ministerial Meeting, ONOMM) set policy: overall production levels and each country’s number. Full meetings historically convene about twice a year in Vienna, with extraordinary sessions whenever the market demands.
- The Joint Ministerial Monitoring Committee (JMMC), co-chaired by Saudi Arabia and Russia, meets roughly every two months to review market conditions and conformity. The JMMC cannot change quotas — a nuance newswires garble constantly — but it can and does recommend, and its statements are read as signaling.
- The subset meetings. Since 2023, the countries making additional voluntary cuts have met separately (often by video call, monthly during active periods) to adjust their own tranche. Most of the “OPEC+ decision” headlines of 2025–2026 come from this group, not from full ministerials.
Each participant’s quota is expressed against a negotiated baseline, and baselines are where the real politics live. A higher baseline means your “cut” starts from a bigger number — which is why the UAE fought for years to raise its reference level, and why Angola quit outright when its baseline was cut to reflect declining capacity. When you read that a country “cut 500,000 b/d,” always ask: from what baseline, and was that baseline ever real production?
Layered on top of the base agreement sit the voluntary tranches that have defined policy since 2022: a group-wide 2 million b/d cut agreed in October 2022, an additional ~1.65 million b/d of voluntary cuts from eight countries announced in April 2023, and a further 2.2 million b/d voluntary layer from November 2023. The unwinding of that 2.2 tranche, begun in April 2025 at a deliberately brisk pace, marked the group’s pivot from defending price to defending market share — a pivot the 2026 war then overtook entirely.
The quota table, July 2026
After the UAE’s exit, seven countries carry the active voluntary-cut quotas. At the June 7, 2026 meeting — the fourth adjustment since the Strait of Hormuz closed — they added another 188,000 b/d for July, per the OPEC secretariat’s statement and wire reports of the country allocations:
| Country | July 2026 quota (mb/d) | Change vs June |
|---|---|---|
| Saudi Arabia | 10.35 | +62,000 b/d |
| Russia | 9.82 | +62,000 b/d |
| Iraq | 4.38 | +26,000 b/d |
| Kuwait | 2.64 | +16,000 b/d |
| Kazakhstan | 1.61 | +10,000 b/d |
| Algeria | 0.995 | +6,000 b/d |
| Oman | 0.831 | +5,000 b/d |
Iran, Libya and Venezuela remain exempt. Including the exempt producers and the smaller quota-holders, the alliance’s total July target works out to about 35.8 million b/d before compensation adjustments. Treat every number in that table as a legal fiction with a political message attached: with Gulf loadings throttled by the war, several of these countries cannot physically produce to their ceilings, which is precisely why the increases keep coming — they are free to grant and they signal that the group would supply the market if only it could.
Compliance: who checks, who cheats, and what it costs
Quotas without verification are press releases. The verification layer is the part professional traders actually watch.
Conformity is assessed against secondary sources — independent estimators rather than the members’ own self-reported figures, for the obvious reason. Since early 2025 the designated secondary sources have been Kpler, OilX and ESAI, which took over the role previously played by firms such as Rystad Energy and the EIA. Their monthly production estimates, alongside the surveys in OPEC’s own Monthly Oil Market Report, are the scoreboard: when they show a country pumping above target, that country is formally asked to submit a compensation plan to the secretariat.
Compensation is the group’s enforcement invention: overproducers must cut below quota in later months to pay back cumulative excess. The current compensation regime covers overproduction since January 2024 and has been extended through December 2026. The repeat offenders are no secret. Kazakhstan has overshot more or less continuously as the Tengiz expansion ramped — Astana’s position, roughly, is that it cannot tell Chevron-led megaprojects to slow down — and Iraq has run above target for long stretches with Kurdish-region volumes complicating the count. The honest way to read OPEC+ arithmetic: announced cuts overstate delivered cuts, and compensation schedules exist partly so that yesterday’s cheating can be reclassified as tomorrow’s (never quite delivered) extra cut. Model actual barrels, not communiqués — the gap between the two is the whole game, as we detail in our guide to oil supply and demand fundamentals.
Quotas in wartime: the 2026 reality check
Since late February 2026, when strikes on Iran escalated into attacks on shipping and the effective closure of the Strait of Hormuz, the quota system has been running in a strange parallel universe. Roughly a fifth of the world’s oil normally transits Hormuz; with loadings from the Gulf severely restricted, Brent pushed back above $100 in early March for the first time in four years and touched the mid-$120s at the peak, while the IEA described the episode as the largest supply disruption in the history of the oil market. By late April, analysts estimated the core Gulf producers — Saudi Arabia, Iraq and Kuwait — were producing several million barrels a day below their permitted levels, simply because the barrels couldn’t ship.
In that world, quota increases are symbolic — and the market trades them as such. The 188,000 b/d July increase moved prices barely at all on the day; what moves crude now is tanker traffic, escort convoys and diplomatic headlines. But symbols compound. The monthly increases pre-position the group’s legal production ceilings for the day the strait reopens, and that is a genuinely two-sided risk for anyone short: a de-escalation headline releases both stranded Gulf barrels and accumulated quota headroom onto a market that has been pricing scarcity for months. Wars end faster than production agreements.
What history says: two case studies in cartel behavior
March 2020: the price war. When Russia refused deeper cuts as COVID demand collapsed, Saudi Arabia responded by slashing its official selling prices and maxing output — a deliberate market-share war inside the alliance. Brent halved within weeks, and by April 20 the expiring WTI contract printed −$37.63 as Cushing storage effectively filled. The episode ended with the largest coordinated cut ever agreed: about 9.7 million b/d from May 2020. Lesson one: OPEC+ discipline is conditional, and when it breaks, it breaks discontinuously. Lesson two: the group’s capacity to act is real — the 2020 cuts, helped by recovering demand, took crude from the twenties back to the sixties within a year.
2023–2025: the cut stack and the pivot. The voluntary cuts of 2023 defended prices through a soft demand patch, but at the cost of market share handed to US shale, Guyana and Brazil — non-OPEC supply the group cannot discipline. By spring 2025 Riyadh’s patience ran out, and the accelerated unwind that began that April was widely read as a warning shot at both quota cheats and non-OPEC growth. Lesson: quotas are a strategy, not an identity. The group toggles between defending price and defending share, and identifying which regime you are in is the single most valuable piece of OPEC+ analysis you can do.
Reading an OPEC+ communiqué like a professional
OPEC+ statements are written in a dialect designed to preserve optionality, and the market pays people well to translate. A short decoder, built from a decade of these documents:
- “Gradual and flexible” / “subject to market conditions” — the announced schedule is a default, not a commitment. Every monthly increment since 2024 has carried this caveat, and several have been paused or resized under it.
- “The group will remain vigilant and stands ready to take additional measures” — the put option. This phrase is doing real work: it tells shorts that a defensive cut can arrive between meetings, which quietly supports the bid even when the actual decision disappoints.
- “Full conformity and compensation for overproduced volumes” — a public shaming of specific members without naming them. When this language sharpens, check the Kazakhstan and Iraq estimates in the next secondary-source round.
- Meeting format itself is signal. A quick video call means consensus was pre-cooked; an in-person Vienna session scheduled at short notice means something is contested. The 2020 price war began with a meeting that broke up without a statement at all — the most bearish communiqué is the one that doesn’t exist.
None of this is cynicism for its own sake. The group’s credibility is a priced asset: crude carries a risk premium partly because traders believe OPEC+ can and will act. Every gap between words and delivered barrels erodes that premium a little, which is why the secretariat polices language as carefully as production. When you trade the statement, you are trading the market’s estimate of the group’s credibility — a quantity that moves slowly, until it moves all at once, as it did in March 2020.
How traders should use OPEC+ data
A practical checklist for turning cartel bureaucracy into tradable information:
- Put the calendar in your calendar. Ministerial meetings, the subset video calls and every-two-months JMMC sessions are scheduled event risk, like Fed days for crude. Weekend meetings can gap Monday opens; hold size accordingly.
- Trade the delta between announced and delivered. The monthly secondary-source prints (and OPEC’s MOMR) tell you whether announced cuts are becoming real barrels. A 400,000 b/d announced cut delivered at 60% compliance is a 240,000 b/d cut; price it that way.
- Watch official selling prices. Saudi Aramco’s monthly OSPs — differentials against benchmarks like Oman/Dubai for Asian buyers — reveal how the biggest producer reads physical demand weeks before it says anything in a communiqué. Aggressive OSP cuts into Asia are a bearish tell regardless of the official line. How those benchmark differentials work is covered in our explainer on crude oil benchmarks.
- Separate exempt from quota-bound supply. Iran, Libya and Venezuela sit outside the quota system, and swings in their output routinely dwarf a month’s worth of quota adjustments. A Libyan port blockade can offset an entire OPEC+ increase.
- Don’t trade the headline; trade the reaction. OPEC+ decisions leak, and the market often prices the outcome days ahead. The information is in how crude responds to the confirmed number — a market that can’t rally on a bullish surprise is telling you something more useful than the communiqué did.
For position sizing and instrument selection around these events — futures, spreads or options — the frameworks in our crude oil trading guide apply directly.
Where to verify the numbers yourself
OPEC+ coverage is noisy, and half the “delegates say” stories contradict each other by lunchtime. Primary sources keep you honest. The secretariat publishes every decision, quota table and JMMC statement at opec.org, usually within hours of a meeting, along with the Monthly Oil Market Report and its secondary-source production tables mid-month. For the demand-side and inventory context that quota decisions respond to, the EIA’s Short-Term Energy Outlook publishes monthly global balances that most desks treat as the neutral baseline; the IEA’s Oil Market Report is its (frequently disagreeing) counterpart. And the market’s verdict on all of it is the Brent curve — ICE Brent futures (symbol B) remain the cleanest instrument for trading OPEC+ policy, since the group’s barrels price into waterborne crude before anything else.
A useful monthly discipline: when the MOMR secondary-source table lands, compare each quota-holder’s estimated production against the table above. Ten minutes of arithmetic tells you who is compensating, who is cheating and whether the group’s headline number is becoming physical supply — ahead of the columnists who will write it up a week later.
The bottom line
OPEC+ in 2026 is a smaller, more stressed and more interesting institution than the one that signed the Declaration of Cooperation a decade ago: 11 OPEC members plus 10 partners, seven active quota-holders, one superpower-sized departure and a war that has temporarily replaced the quota table as the arbiter of supply. The machinery still matters — baselines, JMMC reviews, secondary sources, compensation schedules — because when the geopolitical fog clears, that machinery is what will decide how many barrels come back and how fast. Understand the members and their quotas, and the daily headlines resolve into strategy; the full picture of the cartel’s market power is in our complete guide to how OPEC controls oil prices.
