Digitalisation has facilitated saving data in various warehouses. While Big Data is a new form of capital that is often considered an asset for organisations, the potential value of data to customers has seldom been addressed. This chapter discusses MyData (personified and personalised data) and aims to increase our understanding of its benefits and the value created when customers use their own data. The empirical data for this paper were collected from customers of a large retail organisation that adopted the practice of sharing data with customers. This study has found that value accruing from customer’s shopping data is multifaceted and can be either positive (creating value) or negative (destroying value).