Michael Spencer, Baron Spencer of Alresford, is a British billionaire businessman and philanthropist. He is the founder of NEX Group, a UK-based business focused on electronic markets and post-trade business, which CME Group acquired in November 2018. NEX Group was formerly known as ICAP, until the sale of its voice-broking business in December 2016. In 2018, Spencer was described as the richest self-made person in the City of London, and he was awarded a peerage in August 2020.