Tim Pullen is Chief Financial Officer at Arm. He joined the business in July 2017. He was previously at O2 | Telefonica UK, where he held a variety of positions including Finance Director for Technology Operations and Transformation, Finance Director for O2’s B2B and Digital Products segments, Head of Finance Operations and was a non-Executive Director at Tesco Mobile. Prior to O2, Tim has worked in a number of technology and services businesses, including Serco, Fujitsu and Dell. He is a Chartered Accountant by background having qualified with Ernst & Young.