This study applies thematic analysis to explore how digital transformation is integrated in driving sustainable growth within the circular economy across five case studies from global industry leaders: Philips, Unilever, BMW, Interface, and Nestlé. These case studies show how the implementation of advanced digital-based technologies, such as IoT, AI, blockchain, and 3D printing, supports circular economy principles such as resource optimization, waste reduction, and product lifecycle extension. Through thematic coding, the approaches of the firms were found to have frequent themes about technological innovation and sustainability challenges, efficiency gains and collaborative efforts. The frequent themes suggest that digital tools enable transparency as well as track resource flows but also provide common barriers such as high implementation costs and supply chain complexity. These issues add to the contribution for better understanding of how businesses can use technology in stimulating circular economies, solving sustainability hurdles, and building sustainable, resource-constrained long-term values. This paper presents contributions both to academia and industries looking to understand the prospects offered by digital transformation toward steering firms through a circular economy context.