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Ngamia-1 Drilling Update

25 May 2012 – Tullow Oil plc (Tullow) this morning hosted a meeting with certain investors in Nairobi.  During the course of this meeting it was inadvertently indicated that the Ngamia-1 well was drilling into the primary target and that initial results appeared to indicate that the well had intersected further oil bearing sands.

The Company wishes to clarify that the Ngamia-1 well has encountered oil and gas shows over a gross interval of 140 metres from a depth of 1,800 metres to 1,940 metres. The reservoirs are similar to those previously encountered at a shallower depth. The well will continue to be drilled to a total depth of 2,700 metres and then logged and sampled. This is expected to take a further three weeks to complete.

For further information contact:

Tullow Oil plc

(+44 20 3249 9000)

Chris Perry

Investor Relations

James Arnold

Investor Relations

George Cazenove

Media Relations

Citigate Dewe Rogerson

(+44 207 638 9571)

Martin Jackson

Kate Lehane

Murray Consultants

(+353 1 498 0300)

Joe Murray

Ed Micheau