FIRST DAY OF TRADING IN TULLOW OIL SHARES ON THE GHANA STOCK EXCHANGE

27 July 2011 – Following the announcement made on 21 July 2011, Tullow Oil plc (Tullow) now confirms that 3,531,546 ordinary shares of 10p each in the capital of Tullow (Shares) have today been admitted to the official list of the UK Listing Authority and the official list of the Irish Stock Exchange and to trading on the main markets of the London Stock Exchange and the Irish Stock Exchange (Admission).

Following Admission, the total number of shares in issue is 903,846,948, and the total number of voting rights in the Company is 903,846,948. The Company holds no shares in treasury.

Tullow also confirms that with effect from 10 a.m. Ghana time (11 a.m. UK time) today, its Shares will commence trading on the Ghana Stock Exchange (symbol: TLW), with a market capitalisation of approximately 28.18 billion Ghana Cedis. The listing more than doubles the entire market capitalisation of the Ghana Stock Exchange and makes it one of the largest Stock Exchanges in sub-Saharan Africa, outside of South Africa and Nigeria.

The above figure may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, the Company under the FSA's Disclosure and Transparency Rules.

Commenting today, Aidan Heavey, Chief Executive, said: “This is an historic day for Tullow Oil as our shares begin trading in Ghana for the first time. I am delighted by the success of our offer and excited that we now have a stock market presence in Africa, 25 years after the company was founded.”

Tullow Group Overview

Tullow is a leading independent oil & gas, exploration and production group, quoted on the London, Irish and Ghanaian (symbol: TLW) stock exchanges and is a constituent of the FTSE 100 Index. The Group has interests in over 90 exploration and production licences across 22 countries and focuses on four core areas: Africa, Europe, South Asia and South America.

In Africa, Tullow has production in Ghana, Gabon, Côte d'Ivoire, Mauritania, Congo (Brazzaville) and Equatorial Guinea with two large appraisal and development programmes in Ghana and Uganda. Tullow also has exploration interests in Gabon, Côte d'Ivoire, Liberia, Sierra Leone, Mauritania, Senegal, Tanzania, Madagascar, Namibia, Kenya and Ethiopia.

Tullow’s European interests are focused on gas in the UK Southern North Sea where it has significant interests in the Caister-Murdoch System and the Thames area and in the Netherlands where it has offshore gas production, development and exploration opportunities.

In South Asia, Tullow has exploration and production in Bangladesh and exploration interests in Pakistan. In South America, Tullow has exploration interests in Guyana, French Guiana and Suriname.