The purpose of this paper is to advance and empirically investigate how perceived organisational support influences marketing managers' boundary-spanning marketing activities (cross-functional communication and customer connections), and how these activities subsequently impact supply-chain
efficiency. By analysing survey responses from 348 marketing managers, we demonstrate that a supportive organisational climate provides managerial incentives not only to develop strong allegiance to the welfare of multi-foci groups within the organisation but also to engage in active cross-functional
market intelligence exchange and customer servicing, which in turn leads to superior supply-chain efficiencies. The paper offers strategic guides to both academicians and practitioners on how to promote marketing managers' role in strengthening dependencies among various functional departments
for cohesive product, service, and financial offerings.