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World's biggest oil and gas companies

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 billion

Ranking (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 billion

Ranking (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 billion

Ranking (2010): 3

Share price change: 17 per cent

Country: The United States

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World's biggest oil and gas companies

Petrobras

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 billion

Ranking (2010): 6

Share price change: -19 per cent

Country: Russia

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World's biggest oil and gas companies

TOTAL

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 billion

Ranking (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 billion

Ranking (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 billion

Ranking (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 billion

Ranking (2010): 13

Share price change: 1 per cent

Country: Colombia

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World's biggest oil and gas companies

Eni

Market cap: $83.1 billion

Ranking (2010): 14

Share price change: -4 per cent

Country: Italy

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World's biggest oil and gas companies

Statoil

Market cap: $81.9 billion

Ranking (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 billion

Ranking (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 billion

Ranking (2010): 16

Share price change: -4 per cent

Country: The United States

World's biggest oil and gas companies

Rosneft

Market cap: $74.7 billion

Ranking (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 billion

Ranking (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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World's biggest oil and gas companies

Suncor

Market cap: $45.5 billion

Ranking (2010): 23

Share price change: -25 per cent

Country: Canada