Holding(s) in Company

31st Oct 2012 12:40

TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi

1. Identity of the issuer or the underlying issuer Magnolia Petroleum Plcof existing shares to which voting rights are

attached:ii GB00B1G3RY22

2. Reason for the notification (please tick the appropriate box or boxes): An acquisition or disposal of voting rights

Yes

An acquisition or disposal of qualifying financial instruments which may result n/a in the acquisition of shares already issued to which voting rights are attached

An acquisition or disposal of instruments with similar economic effect to

Yes

qualifying financial instruments An event changing the breakdown of voting rights

n/a Other (please specify): n/a 3. Full name of person(s) subject to the UBS Investment Bank notification obligation:iii 4. Full name of shareholder(s) UBS AG London Branch (if different from 3.):iv

5. Date of the transaction and date on which the threshold is crossed or 29 October

2012 reached: v

6. Date on which issuer notified: 31 October

2012

7. Threshold(s) that is/are crossed or 12%

reached: vi, vii 8. Notified details:

A: Voting rights attached to shares viii, ix Class/type Situation previous Resulting situation after the triggering transaction of to the triggering shares transaction Number Number Number Number of voting % of voting rights x if possible of of of shares rights using Shares Voting the ISIN Rights Direct Direct xi Indirect Direct Indirect CODE xii GB00B1G3RY22 86,767,819 86,767,819 44,155,716 44,155,716 - 5.65% -

B: Qualifying Financial Instruments Resulting situation after the triggering transaction

Type of Expiration Exercise/ Number of voting % of voting financial date xiii Conversion Period xiv rights that may be rights instrument acquired if the instrument is exercised/ converted. - - - - - C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction Type of Exercise price Expiration Exercise/ Number of voting rights % of voting rights financial date xvii Conversion instrument refers to xix, xx instrument period xviii Nominal Delta Equity Swaps n/a 01 Apr 2016 at any time 49,643,098 6.35% - Total (A+B+C) Number of voting rights Percentage of voting rights 93,798,814 12.00%

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

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: Konstantina Georgaki / Zuzana Gorogova 15. Contact telephone number: +41 44 239 4071

XLON

---

Related Shares:

Magnolia Petroleum