Arnout Schuijff (born 1967/1968) is a Dutch billionaire Internet entrepreneur, and the co-founder and chief technology officer (CTO) of Adyen. From 1997 to 2004, Schuijff was systems architect at Bibit Global Payment Services. In 2006, Schuijff co-founded Adyen. In June 2018, he became a billionaire after Adyen's IPO, based on his 6.4% stake in the company. Co-founder and CEO Pieter van der Does has a 4.8% stake worth $800 million, and his brother, , has a stake worth $500 million. As of September 2019, Arnout is ranked #1605 on the Forbes list of billionaires and worth about US$1.3 billion.