The Cambridge computer science graduate will join MarketAxess in March following Themelis’ retirement.
MarketAxess says Themelis, whose last day is 28 February, will stay on in an advisory capacity through 2022 to ensure a smooth transition.
MarketAxess CEO and chairman Rick McVey says Themelis has been “essential” to the business over his 16-year run as CIO. As technology strategy leader, Themelis has overseen “many important innovations throughout this period that have improved trading efficiency and reduced transaction costs for our clients”, McVey adds.
