Holding(s) in Company

OMG PLC
21 March 2007


                TR-l: 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):


OMG PLC Ordinary Shares of 0.25p


2.    Reason for the notification: (please state Yes/No):


Initial notification for compliance with UK Transparency Directive implemented
on 20 January 2007


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) Notification for the FSA 20th March 2007 Deadline


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


Gartmore Investment Limited


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


Gartmore Fund Managers Limited A/C Gartmore UK & Irish Smaller Companies 7.323%



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



6.               Date on which issuer notified:


19 March 2007


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


11%


8.    Notified details:



A: Voting rights attached to shares

Class /type of shares Situation Previous to   Resulting situation after the Trggering Transaction vii
                      the Triggering
                      Transaction
If possible using  Number of   Number of    Number of Shares       Number of voting        % of voting
the ISIN CODE      Shares      Rights viii                         voting Rights iv        Rights
                                                   
                                 
                                              Direct      Indirect    Direct x    Indirect xi  Direct  Indirect

Ordinary shares                  11%          6,984,717                             6,984,717           11.628%

GB0030312788


B: Financial Instruments


Resulting situation after the triggering transaction xii

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

n/a



Total (A+B)

Number of voting rights            % of voting rights


6,984,717                          11.628%




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



Proxy Voting:


10.   Name of the proxy holder:


Not applicable


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


Not applicable


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


Not applicable


13.   Additional information


Not applicable


14.   Contact name:


Alison Averono


15.   Contact telephone number:


+ 44 (0)20 7782 2324



Annex to 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):


Gartmore Investment Limited


Contact address (registered office for legal entities):


Gartmore House, 8 Fenchurch Place, London, EC3M 4PB


Phone number:


[phone]


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


Not applicable



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


Full name:


Alison Averono


Contact address:


Gartmore House, 8 Fenchurch Place, London, EC3M 4PB



Phone number:


[phone]



Other useful information (e.g. functional relationship with the person or legal

entity subject to the notification obligation)


Fax: [phone]


END


21 March 2007




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