Notice of Results

Date for release of 2013 interim results

Inmarsat plc will report consolidated interim results for the six months ended 30 June 2013 and Inmarsat Group Limited will release consolidated financial results for the second quarter ended 30 June 2013 on Friday 2 August at 07:00 hrs BST (London time).

Inmarsat management will discuss the interim results and other financial and business information in a conference call on Friday 2 August 2013 at 14.00 hrs BST (UK), 09.00 hrs EST (US).

To access the call please dial +44 (0) 20 3427 1905. The conference id for the call is 9834847.

The call will be recorded and available for one week after the event. To access the recording, please dial +44 (0) 20 3427 0598 and enter the access code 9834847#.

The call will also be available via a webcast accessible through our website: http://www.inmarsat.com/webcast

Enquiries:

Mary Lally

Tel: +44 (0)20 7728 1206

Mary.Lally@inmarsat.com