Warren East, Chief Executive, ARM Holdings
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Warren East of ARM Holdings on staying ahead in chip design

The chief executive of British computer chip designer ARM Holdings, Warren East, has told the BBC's Philip Hampsheir how the company has managed to beat off rival competition.

The technology created by the company is in more than 95% of all the world's mobile phones.

Many companies over the last decade have lost their status as market leader as they have been challenged by rivals.