Drawing from a longitudinal field study on an IS development in the Investment Banking industry, in this paper we explore the implications emerging from the IS role in the provision of knowledge-based services to clients. By analysing the unique process by which the ‘IS under study’ has been developed, we aim to identify and explain factors contributing to the IS’s resounding success and especially its role as an enabler of knowledge sharing between the Company’s financial analysts and clients. The paper aims to contribute to a deeper understanding of underlying processes of IS-organisation co-evolution that made the IS a success.