A consulting firm PFC Energy has just released its annual ranking of the biggest oil and gas companies in the world as measured by market value.
Let us have a look at the top 20 oil and gas companies in the world, according to Business Insider.
Note: 2011 rankings are not yet available.
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World's biggest oil and gas companies
ExxonMobil
Market cap: $406.3 billionRanking (2010): 1
Share price change: 16 per cent
Country: The United States
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World's biggest oil and gas companies
PetroChina
Market cap: $276.6 billionRanking (2010): 2
Share price change: -9 per cent
Country: China
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World's biggest oil and gas companies
Royal Dutch Shell
Market cap: $234.6 billion
Ranking (2010): 4
Share price change: 10 per cent
Country: Netherlands
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World's biggest oil and gas companies
Chevron
Market cap: $211.9 billionRanking (2010): 3
Share price change: 17 per cent
Country: The United States
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World's biggest oil and gas companies
Market cap: $156.3 billion
Ranking (2010): 3
Share price change: -33 per cent
Country: Brazil
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World's biggest oil and gas companies
BP
Market cap: $135.5 billion
Ranking (2010): 7
Share price change: -2 per cent
Country: The United Kingdom
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World's biggest oil and gas companies
Gazprom
Market cap: $122.6 billionRanking (2010): 6
Share price change: -19 per cent
Country: Russia
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World's biggest oil and gas companies
Market cap: $121.0 billion
Ranking (2010): 8
Share price change: -3 per cent
Country: France
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World's biggest oil and gas companies
Sinopec
Market cap: $97.4 billionRanking (2010): 11
Share price change: -7 per cent
Country: China
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World's biggest oil and gas companies
ConocoPhillips
Market cap: $96.8 billionRanking (2010): 12
Share price change: 7 per cent
Country: The United States
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World's biggest oil and gas companies
Schlumberger
Market cap: $91.7 billionRanking (2010): 9
Share price change: -18 per cent
Country: The United States
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World's biggest oil and gas companies
Ecopetrol
Market cap: $88.0 billionRanking (2010): 13
Share price change: 1 per cent
Country: Colombia
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World's biggest oil and gas companies
World's biggest oil and gas companies
Statoil
Market cap: $81.9 billionRanking (2010): 19
Share price change: 9 per cent
Country: Norway
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World's biggest oil and gas companies
CNOOC
Market cap: $78.1 billionRanking (2010): 10
Share price change: -26 per cent
Country: China
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World's biggest oil and gas companies
Occidental
Market cap: $76.1 billionRanking (2010): 16
Share price change: -4 per cent
Country: The United States
World's biggest oil and gas companies
Rosneft
Market cap: $74.7 billionRanking (2010): 18
Share price change: -2 per cent
Country: Russia
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World's biggest oil and gas companies
BG
Market cap: $72.5 billionRanking (2010): 20
Share price change: 6 per cent
Country: The United Kingdom
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World's biggest oil and gas companies
GDF Suez
Market cap: $61.7 billion
Ranking (2010): 15
Share price change: -24 per cent
Country: France
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