SHARE OFFER OF TULLOW OIL ON GHANA STOCK EXCHANGE IS A GREAT SUCCESS

Sources with direct knowledge of it, report that Tullow Oil plc (Tullow) will soon issue a statement saying that it is pleased to announce the allotment of 3,531,546 ordinary shares of 10p each in the capital of Tullow (Shares), which rank pari passu with the existing Shares in issue, pursuant to the offer for subscription of up to 4,000,000 Shares (the Offer) in connection with Tullow’s secondary listing on the Ghana Stock Exchange (GSE).

It will be the largest primary share offer ever completed on the GSE and this will more than double the market capitalisation of the GSE.

As Tullow previously announced on 13 June 2011, the Offer was open between 13 June and 4 July 2011 with Shares offered at 31 Ghana Cedis. During this period, 10,147 valid applications were received for 3,531,546 Shares representing a total amount of 109,477,926 Ghana Cedis (approximately 72.3 million US Dollars). It is expected that the secondary listing and the first day of trading of Shares on the GSE will be on 27 July 2011.

Application will be made to the UK Listing Authority for the admission to the Official List of those 3,531,546 Shares and to the London Stock Exchange plc for such Shares to be admitted to trading. Admission of such Shares to the Official List and to trading on the London Stock Exchange plc's main market for listed securities is expected to occur on 27 July 2011. It is expected that such Shares will be admitted to trading on the Irish Stock Exchange on the same day.

Information for Offer applicants:

All applicants who submitted valid applications in the Offer will receive all of the Shares they applied for. As a result of this, there will be no refunds. Applicants will have their Ghana Stock Exchange Securities Depository Accounts credited with their allotted Shares by 25 July 2011 and may commence trading such Shares on 27 July 2011.

According to a source with direct access to Tullow's top management who has sighted it, the company's Chief Executive, Aidan Heavey, will express his sentiments by stating that he is:“... delighted by the success of our offer on the Ghana Stock Exchange, the largest primary share offer ever completed in Ghana. Ghana remains at the heart of Tullow’s investment decisions and underpins our long-term future in Africa. I would like to welcome all new shareholders, including Ghana’s National Basic Pension Scheme, to Tullow and thank them for their investment in the company. I look forward to updating all our shareholders with news of our progress, both in Ghana and beyond, over the coming years.”

Tullow Group Overview

Tullow is a leading independent oil & gas, exploration and production group, quoted on the London and Irish Stock Exchanges (symbol: TLW) 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 primarily focused on gas in the UK Southern North Sea where it has significant interests in the Caister-Murdoch System and the Thames area. The company also has interests offshore the Netherlands.

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.