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This question is about largest oil companies.
The richest oil tycoon in history is John D. Rockefeller. He owned Standard Oil and controlled 90% of all oil in the United States at its peak. Rockefeller's personal wealth in 1913 was $900 million, or about 3% of the United States GDP at the time (to give you an idea, that would be the equivalent of owning all of the restaurants in the country in 2021).
Adjusting for inflation, Rockefeller's fortune would be worth $23.6 billion today, which would put him at only 10% of the fortune amassed by Elon Musk.
While Standard Oil was eventually broken up for violating federal antitrust laws, the company lives on today as ExxonMobil, Chevron, and other smaller entities.

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