Rule 8.3 - Inmarsat Plc

    FORM 8.3                                    

   DEALINGS BY PERSONS WITH INTERESTS IN SECURITIES REPRESENTING 1% OR MORE    

             (Rule 8.3 of the City Code on Takeovers and Mergers)              

1. KEY INFORMATION

Name of person dealing (Note 1) ALLIANZ GLOBAL INVESTORS GLOBAL EQUITY BUSINESS
                                UNIT                                           
                                                                               
Company dealt in                Inmarsat Plc                                    
                                                                               
Class of relevant security to   ORDINARY SHARES                                
which the dealings being                                                       
disclosed relate (Note 2)                                                      
                                                                               
Date of dealing                 22 July 2008                                   

2. INTERESTS, SHORT POSITIONS AND RIGHTS TO SUBSCRIBE

(a) Interests and short positions (following dealing) in the class of relevant
security dealt in (Note 3)

                                         Long                   Short          
                                                                               
                                Number (%)             Number (%)              
                                                                               
(1) Relevant securities         12,730,583 (2.777)                             
                                                                               
ORDINARY SHARES                                                                
                                                                               
(2) Derivatives (other than                                                    
options)                                                                       
                                                                               
(3) Options and agreements to                                                  
purchase/sell                                                                  
                                                                               
TOTAL                           12,730,583 (2.777)                             
                                                                               

(b) Interests and short positions in relevant securities of the company, other
than the class dealt in (Note 3)

Class of relevant security:              Long                   Short          
                                                                               
                                Number (%)             Number (%)              
                                                                               
(1) Relevant securities                                                        
                                                                               
(2) Derivatives (other than                                                    
options)                                                                       
                                                                               
(3) Options and agreements to                                                  
purchase/sell                                                                  
                                                                               
Total                                                                          

(c) Rights to subscribe (Note 3)

Class of relevant security:     Details                                        
                                                                               
Ordinary                                                                       

3. DEALINGS (Note 4)

(a) Purchases and sales

Sale/Purchases       Number of securities             Price per unit (Note 5)  
                                                                               
Purchase             2,055                            £4.6236                  

(b) Derivatives transactions (other than options)

Product name,  Long/short (Note  Number of securities     Price per unit (Note 
               6)                (Note 7)                 5)                   
e.g. CFD                                                                       
                                                                               

(c) Options transactions in respect of existing securities

(i) Writing, selling, purchasing or varying

Product name, Writing,    Number of     Exercise Type, e.g. Expiry  Option     
              selling,    securities to          American,          money      
e.g. call     purchasing, which the     price    European   date               
option        varying     option                 etc.               paid/      
              etc.        relates (Note                             received   
                          7)                                        per unit   
                                                                    (Note 5)   
                                                                               

(ii) Exercising

Product name, e.g. call    Number of securities      Exercise price per unit   
option                                               (Note 5)                  
                                                                               

(d) Other dealings (including new securities) (Note 4)

Nature of transaction      Details                   Price per unit (if        
(Note 8)                                             applicable) (Note 5)      
                                                                               

4. OTHER INFORMATION

Agreements, arrangements or understandings relating to options or derivatives

Full details of any agreement, arrangement or understanding between the person 
disclosing and any other person relating to the voting rights of any relevant  
securities under any option referred to on this form or relating to the voting 
rights or future acquisition or disposal of any relevant securities to which   
any derivative referred to on this form is referenced. If none, this should be 
stated.                                                                        
                                                                               

Is a Supplemental Form 8 attached? (Note 9) NO

Date of disclosure                           23 July 2008                      
                                                                               
Contact name                                 Dresdner Kleinwort Media Relations
                                             Team                              
                                                                               
Telephone number                             020 7623 8000                     
                                                                               
If a connected EFM, name of offeror with                                       
which connected                                                                
                                                                               
If a connected EFM, state nature of                                            
connection (Note 10)                                                           

Notes

The Notes on Form 8.3 can be viewed on the Takeover Panel's website at 
www.thetakeoverpanel.org.uk



END