Integration of supply chains is considered to be of strategic and operational importance but the role(s) of logistics service providers (LSPs) in supply chain integration (SCI) remain(s) unclear. Results from previous research form the foundation for this empirical research: an embedded single-case quantitative study within a European leading logistics company claiming to be a “logistics integrator.” Our research gives support to a composite approach to map LSPs' roles in supply chain integration and confirms that LSPs play a plurality of roles in SCI. The field material also provides puzzling results that call for further research in this area.