Inmarsat Regulatory News (ISAT)

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

INMARSAT PLC

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

An acquisition or disposal of voting rights

x

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

x

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

x

An event changing the breakdown of voting rights

Other (please specify):

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

Deutsche Bank AG

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

Deutsche Bank AG, London Branch

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

10/03/2017

6. Date on which issuer notified:

14/03/2017

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

Below notifiable threshold

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

GB00B09LSH68

12,108,442

12,108,442

Below notifiable threshold

Below notifiable threshold

0

Below notifiable threshold

0

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

Nominal

Delta

Total (A+B+C)

Number of voting rights

Percentage of voting rights

Below notifiable threshold

Below notifiable threshold

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:

Elizabeth Akande

15. Contact telephone number:

0207 547 4443