Rule 8.3 - INMARSAT

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        BARCLAYS PLC
(Note 1)
Company dealt in              INMARSAT
Class of relevant security    ORD EUR0.0005
to which the dealings being
disclosed relate (Note 2)
Date of dealing               08 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       9,307,807      2.03%      532,545       0.12%
securities
(2) Derivatives      648,056      0.14%    2,604,218       0.57%
(other than
options)
(3) Options and            0      0.00%            0       0.00%
agreements to
purchase/sell
Total              9,955,863      2.17%    3,136,763       0.68%


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

Class of                    Long                     Short
relevant
security:

                  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



3.   DEALINGS (Note 4)

  (a)  Purchases and sales

Purchase/sale Number of Securities Price per unit
                                   (GBP)
Purchase      13,390               5.0456
Purchase      12,144               5.0358
Purchase      17,817               5.0667
Purchase      48,543               5.0962
Purchase      3,550                5.0542
Purchase      35,797               5.0737
Purchase      10,778               5.0902
Purchase      106,217              5.0592
Purchase      5,000                5.0776
Purchase      2,876                5.0350
Purchase      2,654                5.0350
Purchase      887                  5.0358
Sale          18,164               5.0856
Sale          47,250               5.0695
Sale          24,331               5.1050
Sale          47,260               5.3318
Sale          10,109               5.0428
Sale          16,216               5.0375
Sale          39,568               5.0892
Sale          2,850                5.0700
Sale          2,743                5.0096
Sale          19,048               5.0350
Sale          1,905                5.0350
Sale          13,520               5.0897

(b)  Derivatives transactions (other than options)
Product name,  Long/Short    Number of     Price per
(e.g. CFD)     (Note 6)      Securities    unit (GBP)
CFD            Long          2743          5.0095
CFD            Long          16216         5.0375
CFD            Long          10109         5.0428
CFD            Long          4992          5.0673
CFD            Long          2850          5.07
CFD            Long          18164         5.0855
CFD            Long          39568         5.0891
CFD            Long          13520         5.0897
CFD            Long          24331         5.105
CFD            Long          47260         5.3318
CFD            Short         13031         5.0358
CFD            Short         13390         5.0456
CFD            Short         106217        5.0592
CFD            Short         17817         5.0666
CFD            Short         35797         5.0736
CFD            Short         5000          5.0776
CFD            Short         10778         5.0902
CFD            Short         48543         5.0961

(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 money
e.g. call       selling,          securities to      price     American,       date     paid/received
option          purchasing,       which the option             European etc.            per unit (GBP)
                varying etc.      relates (GBP)


(ii) Exercising

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




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


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




4.   OTHER INFORMATION
None

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                         09 July 2008
Contact name                               Geoff Smith
Telephone number                           020 7116 2913
If a connected EFM, name of
offeree/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