LONDON, July 9 — The term “Seven Sisters” once defined the architecture of global energy power, a group of Western oil majors that dictated the terms of production, refining, and distribution for decades. Coined in the 1950s by Italian businessman Enrico Mattei, the phrase described the seven companies that controlled the petroleum industry from the 1940s through the 1970s: Standard Oil of New Jersey, Royal Dutch Shell, the Anglo-Persian Oil Company, Standard Oil of New York, Standard Oil of California, Gulf Oil, and Texaco.
Strategically, these firms operated as an integrated bloc that spanned the entire supply chain. They held concessions across the Middle East, locked in pricing mechanisms, and managed global flows of crude with little competition from producer nations.
That era, however, has receded into history. The calculus shifted decisively with the rise of the Organization of the Petroleum Exporting Countries and the nationalization wave that followed. Today, the largest oil companies by production are not the Seven Sisters.
They are national oil companies: Saudi Aramco, Russia’s Rosneft, China’s PetroChina, and Iran’s NIOC. Saudi Aramco was founded in 1933 and fully nationalized in 1988.
NIOC was established in 1948. Venezuela’s PDVSA was created in 1976. These state-owned enterprises now hold the vast majority of global oil reserves and output, fundamentally altering the geopolitical chessboard from the days when Western boardrooms set the agenda.
The surviving majors and their scale
The publicly traded successors to the original Seven Sisters remain major players, but their relative weight has diminished. ExxonMobil, formed by a merger in 1999, reported revenue of $344.6 billion in 2023. Shell, BP, Chevron, and TotalEnergies round out the largest publicly traded oil companies today.
Chevron absorbed both Gulf Oil and Texaco through mergers, consolidating three of the original seven into a single entity. What this signals is a structural realignment that has been underway for half a century.
The broader stakes now involve competition not merely between companies, but between state-backed national champions and investor-owned multinationals operating under different constraints and strategic imperatives. Standard Oil of New Jersey and Standard Oil of New York both now exist under the ExxonMobil umbrella. The Anglo-Persian Oil Company became BP.
Standard Oil of California, Gulf Oil, and Texaco all reside within Chevron. Royal Dutch Shell remains Shell.
The consolidation reflects an industry that has continuously restructured to adapt to shifting political realities and market pressures.
National oil companies and the new order
The rise of OPEC in the 1960s and 1970s directly challenged the dominance of the Seven Sisters. Member states began demanding greater control over pricing and production, culminating in nationalizations that stripped the Western majors of their most valuable concessions. Saudi Arabia fully nationalized Aramco in 1988.
Iran took control of its oil industry through NIOC, established in 1948. Venezuela created PDVSA in 1976.
Those national oil companies now dwarf their Western counterparts in production volume. Saudi Aramco alone produces more crude than ExxonMobil, Shell, BP, Chevron, and TotalEnergies combined. Rosneft and PetroChina similarly operate at scales that the original Seven Sisters could not have matched without their Middle Eastern concessions.
Strategically, the competition is no longer just about market share. It is about geopolitical influence.
National oil companies function as instruments of state policy, aligning production decisions with diplomatic objectives. The publicly traded majors must answer to shareholders, quarterly earnings, and regulatory frameworks that increasingly demand energy transition strategies. The broader stakes for the global energy order are clear.
The Seven Sisters era represented a period of Western corporate hegemony over a strategic resource. That era is over. The question now is how the remaining Western majors will navigate a landscape dominated by state-owned giants, and what role they will play in the energy systems of the coming decades.
For now, the numbers tell the story. In 2023, ExxonMobil reported $344.6 billion in revenue — a substantial figure, but one that reflects a very different position than the one its predecessors held in the 1950s.
The chessboard has been reset, and the players are no longer the same.
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