Tullow Oil plc (LSE: TLW) is a global oil and gas exploration company headquartered in London, United Kingdom. It has interests in over 85 licences across 22 countries and in 2009 produced around 58,300 barrels of oil equivalent per day. Its largest activities are in Africa, where it has discovered new oil provinces in Ghana and Uganda, produces oil and gas in five countries and has exploration projects in 13 countries. As at 30 June 2010 it had total proven commercial reserves of 290.5 million barrels of oil equivalent.
Its primary listing is on the London Stock Exchange and it is a constituent of the FTSE 100 Index. It has a secondary listing on the Irish Stock Exchange.
The Company was founded by Aidan Heavey in 1985 in the Republic of Ireland as a gas exploration business operating in Senegal. It was first listed on the London Stock Exchange in 1987 and in September 2007 entered the FTSE100 index. In 2000 it bought BP's North Sea Gas Fields for £200m and then in 2004 it acquired Energy Africa for $570m. It has expanded rapidly in recent years notably through the acquisition of Hardman Resources in January 2007.
In 2006, the company began drilling its first well in Uganda and has drilled circa 30 wells around the Lake Albert region.
In 2007, Tullow drilled two deepwater wells offshore Ghana discovering the massive Jubilee field.