Inmarsat Regulatory News (ISAT)

1. Identity of the issuer or the underlying issuerof existing shares to which voting rights areattached: ii

Inmarsat PLC

Sedol B09LSH6

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

An acquisition or disposal of voting rights

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

An acquisition or disposal of instruments with similar economic effect to qualifying financial instruments

An event changing the breakdown of voting rights (see Section 13)

√

Other (please specify):

3. Full name of person(s) subject to thenotification obligation: iii

¹Lansdowne Partners Limited (the "Firm") being the General Partner of Lansdowne Partners Limited Partnership

²Lansdowne Partners International Limited

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

SNC Nominees Ltd

Goldman Sachs Securities Nominees LtdVidacos Nominees Ltd

HSBC Client Holdings UK Ltd

(Registered Shareholders)

5. Date of the transaction and date onwhich the threshold is crossed orreached: v

08/05/13(please see Section 13)

6. Date on which issuer notified:

19/07/13

7. Threshold(s) that is/are crossed orreached: vi, vii

14%

(please see Section 13)

8. Notified details:

A: Voting rights attached to shares viii, ix

Class/type ofshares

if possible usingthe ISIN CODE

Situation previousto the triggeringtransaction

Resulting situation after the triggering transaction

NumberofShares

NumberofVotingRights

Numberof shares

Number of votingrights

% of voting rights x

Direct

Direct xi

Indirect xii

Direct

Indirect

Ordinary Shares

59,142,059

59,142,059

59,142,059

13.19%

GB00B09LSH68

B: Qualifying Financial Instruments

Resulting situation after the triggering transaction

Type of financialinstrument

Expirationdate xiii

Exercise/Conversion Period xiv

Number of votingrights that may beacquired if theinstrument isexercised/ converted.

% of votingrights

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments xv, xvi

Resulting situation after the triggering transaction

Type of financialinstrument

Exercise price

Expiration date xvii

Exercise/Conversion period xviii

Number of voting rights instrument refers to

% of voting rights xix, xx

CFD

N/A

N/A

N/A

3,599,792

Nominal

Delta

0.80%

Total (A+B+C)

Number of voting rights

Percentage of voting rights

62,741,851

13.99%

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

Lansdowne Partners International Limited is the parent undertaking of Lansdowne Partners Limited.

Proxy Voting:

10. Name of the proxy holder:

Lansdowne Partners Limited

11. Number of voting rights proxy holder will ceaseto hold:

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

13. Additional information:

Based on ordinary shares in issue of 448,298,368.

This notification is not the result of any trading in shares but is to update a prior notification in light of an issuance of shares by Inmarsat Plc (the "Company") that occurred on 8 May 2013. This issuance increased the Company's total number of shares to 448,298,368 and consequently reduced the Firm's indirect interest below 14%. The delay in notification is due to the fact that the Company's revised total number of shares was inadvertently not reflected in our monitoring systems until 19 July 2013.

14. Contact name:

Ruari Paton

15. Contact telephone number:

+44 20 7290 5500