TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES 1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached: EnQuest PLC 2 Reason for the notification(please tick the appropriate box or boxes): An acquisition or disposal of voting rights X An acquisition or disposal of qualifying financial instruments which may result in the acquisition of shares already issued to which voting rights are attached An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments An event changing the breakdown of voting rights Other (please specify): 3. Full name of person(s) subject Legis Trust List as Trustee of the to the notification obligation: Lamia Trust of which Mr Ayman Asfari is a potential beneficiary. 4. Full name of shareholder(s) (if N/A different from 3.): 5. Date of the transaction and date 6 April 2010 on which the threshold is crossed or reached: 6. Date on which issuer notified: 8 April 2010 7. Threshold(s) that is/are crossed 5% or reached: 8. Notified details: A: Voting rights attached to shares Class/type of Situation Resulting situation after the triggering shares previous transaction to the if possible triggering using transaction the ISIN CODE Number Number Number Number of voting % of voting of of of shares rights rights Shares Voting Direct Direct Indirect Direct Indirect Rights Ordinary Nil Nil 41,282,114 41,282,114 Nil 5.327 Nil GB00B635TG28 B: Qualifying Financial Instruments Resulting situation after the triggering transaction Type of financial Expiration Exercise/ Number of voting % of voting instrument date Conversion rights that may be rights Period acquired if the instrument is exercised/ converted. C: Financial Instruments with similar economic effect to Qualifying Financial Instruments Resulting situation after the triggering transaction Type of Exercise Expiration Exercise/ Number of % of voting rights financial price Conversion voting instrument date rights period instrument refers to Nominal Delta Total (A+B+C) Number of voting rights Percentage of voting rights 41,282,114 5.327 9. Chain of controlled undertakings through which the voting rights and/ or the financial instruments are effectively held, if applicable: Proxy Voting: 10. Name of the proxy holder: N/A 11. Number of voting rights proxy holder will cease to hold: N/A 12. Date on which proxy holder will cease to hold voting rights: N/A 13. Additional information: Notification is based on a total voting rights figure of 775,027,922. Ayman Asfari is a beneficiary of the Lamia Trust. Mr Asfari also holds 12,500,000 EnQuest shares in his own name being 1.613% of the share capital of the Company. 14. Contact name: Paul Waters Company Secretary 15. Contact telephone number: +44 (0)20 7925 4900
TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARES
| Source: EnQuest PLC