ATI Oil Plc
LSE : ATIP

April 21, 2009 06:00 ET

Notification of Shareholding

                                                                                                      
                                                                       ISIN: GB00B04BP253/GBP/PLUS-exn
                                                   
                                              ATI Oil Plc
                                             Martin House
                                             5 Martin Lane
                                                London
                                               EC4R 0DP
                                                   
                                       Tel: +44 (0)20 7469 2940
                                       Fax: +44 (0)20 7469 2901
                                        Email: info@ati-oil.com
                                       Website: www.ati-oil.com

                                              ATI Oil Plc
                                        ("ATI" or "the Company")
                                                   
                                     Notification of Shareholding
                                                   
TR-1(i): NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are
   attached (ii):
   ATI Oil Plc

2. Reason for the notification (please place an X inside the appropriate bracket/s):

   An acquisition or disposal of voting rights: (    )
   
   An acquisition or disposal of financial instruments which may result in the acquisition of shares
   already issued to which voting rights are attached: (    )
   
   An event changing the breakdown of voting rights: (    )
   
   Other (please specify): (  x  )
   Notification following transfer of 1.2 million shares held for the benefit of Barry James  Lonsdale
   out of a nominee account into the name of Barry James Lonsdale
   
3. Full name of person(s) subject to the notification obligation (iii):
   Barry James Lonsdale

4. Full name of shareholder(s) (if different from 3.) (iv):
   
5. Date of the transaction (and date on which the threshold is crossed or  reached if different) (v):
   20/04/09

6. Date on which issuer notified:
   21/04/09

7. Threshold(s) that is/are crossed or reached:
   N/A

8. Notified details:
   .......

A: Voting rights attached to shares

Class/type of shares if possible           Situation previous to the Triggering transaction
using the ISIN CODE
                                         Number of shares               Number of voting Rights
                                                                                    
GB00B04BP253                                47,783,000                         47,783,000
                                                                   

Resulting situation after the triggering transaction

Class/type of shares if        Number of shares       Number of voting rights             % of voting rights
possible using the ISIN CODE                                                                    
                                 Direct               Direct              Indirect        Direct      Indirect
                                                                                                                      
GB00B04BP253                   47,783,000             47,783,000            0             50.69        0.00

   

                                                                                                                

B: Financial Instruments
Resulting situation after the triggering transaction (xii)

Type of          Expiration Date (xiii)   Exercise/Conversion Period/  Number of voting rights that   % of voting rights
financial                                 Date (xiv)                   may be acquired if the         
instrument                                                             instrument is exercised/       
                                                                       converted.                     
                                                                                                      
                                                                                                      
Total (A+B)
   Number of voting rights         % of voting rights
                                            
          47,783,000                      50.69
                               

9. Chain of controlled undertakings through which the voting rights and/or the financial instruments
are effectively held, if applicable (xv):
   Barry James Lonsdale
   
Proxy Voting:

10. Name of the proxy holder:
   .......

11. Number of voting rights proxy holder will cease to hold:
   .......

12. Date on which proxy holder will cease to hold voting rights:
   .......
   
13. Additional information:
   .......

14. Contact name:
   Chris Foss, Finance Director

15. Contact telephone number:
   020 7469 2940


The Directors of the Issuer accept responsibility for this announcement.
                                                   
                                                   
                                              ---ENDS---
                                                   
For further information on ATI's Italian assets please see our web site, www.ati-oil.com.
                                                   

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