Nine of the world’s 25 largest public oil and natural gas companies ranked by production are headquartered in North America, but ExxonMobil Corp. was squeezed out of the top spot by two Russian producers, according to an annual compilation by Forbes magazine.

Author Robert Rapier used a proprietary database to rank the world’s leading producers by their oil and gas output, not enterprise value (EV), using a database of 2,367 publicly traded companies. Corporate earnings reports and presentations also were used.

U.S. companies in the Top 25 for last year were led by No. 3 ExxonMobil, with an EV of $390 billion and production of 4.1 million boe/d. Chevron Corp. is at No. 7, with an EV of $207 billion and production of 2.62 million boe/d. ConocoPhillips was ranked 13th, valued at $71.5 billion and output of 1.59 million boe/d, while Anadarko Petroleum Corp. was No. 18 with a $43 billion value and production of 840,000 boe/d. Devon Energy Corp. rounded out the Top 20 with an EV of $29 billion and production of 680,000 boe/d.

Russia’s state-owned producers led the ranking for 2015, with OAO Gazprom at No. 1 followed by OAO Rosneft, with OAO Lukoil at No. 9. China’s PetroChina Co. Ltd. was ranked fourth, while Brazil’s Petroleo Brasileiro was No. 8. France’s Total SA rounded out the Top 10.

Occidental Petroleum Corp. was ranked No. 22 with an EV of $57 billion and production of 650,000 boe/d, while EOG Resources Inc. was 24th with an EV of $47 billion and output of 570,000 boe/d. Top Canadian-based operators were Canadian Natural Resources, in at No. 19 with a $40 billion value and production of 790,000 boe/d, while Suncor Energy Corp. was ranked No. 23 with an EV of $50 billion and production of 580,000 boe/d.

Integrated oil and gas producers whose primary operations are in North America were No. 5 BP plc, valued at $121 billion and production estimated at 3.24 million boe/d, while No. 6 Royal Dutch Shell plc was valued at $216 billion with output of 2.95 million boe/d.

According to the report, the United States is home base for 28% of the largest producers, as well as 21% of total output and 30% of total EV, while Canada has 8% of the producers, 3% of total production and 3% of EV. Russia is headquarters for 16% of the biggest operators, including 32% of output and 7% of value, while China is home to 12% of the largest producers, 13% of production and 30% of EV. European Union countries are home to 20% of the biggest producers, 20% of production and 21% of EV.