Inmarsat Regulatory News (ISAT)

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

Inmarsat Plc

GB00B09LSH68

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 in the acquisition of shares already issued to which voting rights are attached

n/a

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

Yes

An event changing the breakdown of voting rights

n/a

Other (please specify):

n/a

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

UBS Investment Bank

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

UBS AG London Branch

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

29 May 2013

6. Date on which issuer notified:

31 May 2013

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

3%

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 xi

Indirect xii

Direct

Indirect

GB00B09LSH68

No Previous Disclosure

No Previous Disclosure

13,535,475

13,535,475

-

3.02%

-

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

XS0331843523

n/a

16-Nov-2017

9 Years

80,060

Nominal

Delta

0.02%

-

Total (A+B+C)

Number of voting rights

Percentage of voting rights

13,615,535

3.04%

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

Proxy Voting:

10. Name of the proxy holder:

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

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

13. Additional information:

14. Contact name:

Konstantina Georgaki / Tomasz Kluczek

15. Contact telephone number:

+41 44 239 4071