Holding(s) in Company

Gulf Keystone Petroleum Ld
26 March 2007





TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES


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

Gulf Keystone Petroleum Ltd.



2. Reason for the notification (please tick the appropriate box or boxes)


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) :  Transitional Provisions                          ( X )




 
3. Full name of person(s) subject to the notification obligation:

OppenheimerFunds, Inc (QFI)


 

4. Full name of shareholder(s) (if different from 3.):




 

5. Date of the transaction and date on which the threshold is crossed or reached
if different):

20 January 2007

(Following introduction of the EU Transparency Directive)




6. Date on which issuer notified:

20 March 2007

 

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

6%



8. Notified details:

Gulf Keystone Petroleum Ltd, Canon's
Court, 22 Victoria Street Hamilton,
HM12 Bermuda

WWW.gulfkeystone.com

Fax number 011 4 207514 1427

Jon Cooper (Finance Director):
[e-mail]



A: Voting rights attached to shares

 
Class/type of shares            Situation previous to  
if possible using the           the Triggering         
ISIN CODE                       transaction        

                       Number of shares       Number of voting Rights 

BMG4209G1087           17,000,000             17,000,000






Resulting situation after the triggering transaction 
 
Class/type of shares Number of shares  Number of voting rights    % of voting rights  
if possible using                                                                 
the ISIN CODE                                                                         

                     Direct            Direct     Indirect        Direct    Indirect  


BMG4209G1087         17,000,000                   17,000,000                6.14%
 




B: Financial Instruments

Resulting situation after the triggering transaction 

Type of     Expiration Date  Exercise/Conversion Number of voting     % of voting     
financial                    Period/ Date        rights that may be   rights          
instrument                                       acquired if the                      
                                                 instrument is                        
                                                 exercised/                           
                                                 converted.                           

 


Total (A+B)


Number of voting rights       % of voting rights 

17,000,000                    6.14%

 



9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable:


OppenheimerFunds Inc, owns as of 1/20/2007, 17,000,000 shares equal to 6.14% 
based on shares outstanding of 276,755,108. Filing with the issuer was made on
1/12/2007.




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:



 

15. Contact:





Annex Notification Of Major Interests In Shares (XVI)
 

A: Identity of the person or legal entity subject to the notification obligation

 

Full name (including legal form for legal entities):

OppenheimerFunds, Inc, (QFI)

 

Contact address (registered office for legal entities):

2 World Financial Center
225 Liberty Street
New York,
NY 10080




Phone number:

212-323-0200



Other useful information (at least legal representative for legal persons):






B: Identity of the notifier, if applicable (xvii)

 

Full name:

Rosemary Baker, Director



Contact address:

Massachusetts Mutual Life Insurance Co,
1295 State Street
Springfield, MA 01111-0001
USA



Phone number:

413-744-8258




Other useful information (e.g. functional relationship with the person or legal
entity subject to the notification obligation):

Massachusetts Mutual Life Insurance Company is OppenheimerFunds' Parent company.


 

C: Additional information :






Notes to the Forms

(i) This form is to be sent to the issuer or underlying issuer and to be filed
with the competent authority.

(ii) Either the full name of the legal entity or another method for identifying
the issuer or underlying issuer, provided it is reliable and accurate.

(iii) This should be the full name of (a) the shareholder; (b) the person
acquiring, disposing of or exercising voting rights in the cases provided for in
DTR5.2.1 (b) to (h); (c) all the parties to the agreement referred to in
DTR5.2.1 (a), or (d) the direct or indirect holder of financial instruments
entitled to acquire shares already issued to which voting rights are attached,
as appropriate.

In relation to the transactions referred to in points DTR5.2.1 (b) to (h), the
following list is provided as indication of the persons who should be mentioned:

- in the circumstances foreseen in DTR5.2.1 (b), the person that acquires the
voting rights and is entitled to exercise them under the agreement and the
natural person or legal entity who is transferring temporarily for consideration
the voting rights;

- in the circumstances foreseen in DTR 5.2.1 (c), the person holding the
collateral, provided the person or entity controls the voting rights and
declares its intention of exercising them, and person lodging the collateral
under these conditions;

- in the circumstances foreseen in DTR5.2.1(d), the person who has a life
interest in shares if that person is entitled to exercise the voting rights
attached to the shares and the person who is disposing of the voting rights when
the life interest is created;

- in the circumstances foreseen in DTR5.2.1 (e), the parent undertaking and,
provided it has a notification duty at an individual level under DTR 5.1, under
DTR5.2.1 (a) to (d) or under a combination of any of those situations, the
controlled undertaking;

- in the circumstances foreseen in DTR5.2.1 (f), the deposit taker of the
shares, if he can exercise the voting rights attached to the shares deposited
with him at his discretion, and the depositor of the shares allowing the deposit
taker to exercise the voting rights at his discretion;

- in the circumstances foreseen in DTR5.2.1 (g), the person that controls the
voting rights;

- in the circumstances foreseen in DTR5.2.1 (h), the proxy holder, if he can
exercise the voting rights at his discretion, and the shareholder who has given
his proxy to the proxy holder allowing the latter to exercise the voting rights
at his discretion.

(iv) Applicable in the cases provided for in DTR 5.2.1 (b) to (h). This should
be the full name of the shareholder who is the counterparty to the natural
person or legal entity referred to in DTR5.2.

(v) The date of the transaction should normally be, in the case of an on
exchange transaction, the date on which the matching of orders occurs; in the
case of an off exchange transaction, date of the entering into an agreement.

The date on which threshold is crossed should normally be the date on which the
acquisition, disposal or possibility to exercise voting rights takes effect (see
DTR 5.1.1R (3)). For passive crossings, the date when the corporate event took
effect.

(vi) Please refer to the situation disclosed in the previous notification, In
case the situation previous to the triggering transaction was below 3%, please
state 'below 3%'.

(vii) If the holding has fallen below the minimum threshold , the notifying
party should not be obliged to disclose the extent of the holding, only that the
new holding is less than 3%.

For the case provided for in DTR5.2.1(a), there should be no disclosure of
individual holdings per party to the agreement unless a party individually
crosses or reaches an Article 9 threshold. This applies upon entering into,
introducing changes to or terminating an agreement.

(viii) Direct and indirect

(ix) In case of combined holdings of shares with voting rights attached 'direct
holding' and voting rights 'indirect holdings', please split the voting rights
number and percentage into the direct and indirect columns-if there is no
combined holdings, please leave the relevant box blank.

(x) Voting rights to shares in respect of which the notifying party is a direct
shareholder (DTR 5.1)

(xi) Voting rights held by the notifying party as an indirect shareholder (DTR
5.2.1)

(xii) If the holding has fallen below the minimum threshold, the notifying party
should not be obliged to disclose the extent of the holding, only that the new
holding is below 3%.

(xiii) date of maturity / expiration of the finical instrument i.e. the date
when the right to acquire shares ends.

(xiv) If the financial instrument has such a period-please specify the period-
for example once every three months starting from the (date)

(xv) The notification should include the name(s) of the controlled undertakings
through which the voting rights are held. The notification should also include
the amount of voting rights and the percentage held by each controlled
undertaking, insofar as individually the controlled undertaking holds 5% or
more, and insofar as the notification by the parent undertaking is intended to
cover the notification obligations of the controlled undertaking.

(xvi ) This annex is only to be filed with the competent authority.

(xvii) Whenever another person makes the notification on behalf of the
shareholder or the natural person/legal entity referred to in DTR5.2 and DTR5.3


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