The data displays the leading oil companies based on proved oil reserves held in the U.S. in 2017. Oil company ExxonMobil had U.S. oil reserves totaling around 2.9 billion barrels that year. Therefore, ExxonMobil was ranked first based on companies' proved oil reserves within the U.S.
ExxonMobil Corporation | 2940 |
ConocoPhillips | 1974 |
Chevron Corporation | 1916 |
EOG Resources, Inc. | 1808 |
BP p.l.c. | 1669 |