Announcement of half year results date

Inmarsat plc announces date for release of Interim results 2010

Inmarsat plc will report consolidated interim results for the 6 months ended 30 June 2010 on Friday, 6 August 2010. Simultaneously Inmarsat Group Limited will report results for the 3 months ended 30 June 2010. Inmarsat management will host a presentation of the results on Friday, 6 August at Inmarsat's offices, 99 City Road, London EC1Y 1AX. The presentation will begin at 9:30am London time and will be available on our website as a live webcast, www.inmarsat.com

To register to attend the results presentation, please contact Laura Furnival at Inmarsat on +44 (0)20 7728 1206, or [email protected].

For further information contact:

Inmarsat plc:

Laura Furnival +44 (0)20 7728 1206

[email protected]