Purpose The purpose of this paper is to analyse the information shared by SMEs with their main customers and suppliers and its implications on their performance. Design/methodology/approach The paper puts forward the concept of arcs of communication based on the frequency and direction of the information exchanged by SMEs with their main customers and suppliers. SMEs are classified by the arc of communication they belong to using data from a survey carried out in the Canary Islands (Spain). The Rasch Measurement Theory is applied. Findings The largest group of small- and medium-sized enterprises (SMEs) shares information frequently with both customers and suppliers (broad arc of communication). Differences were detected in the performance of SMEs belonging to this broad arc, as well as, in those firms that communicated frequently with their main suppliers (asymmetrical arc of communication towards suppliers). In both cases, these firms were better than their competitors in innovation. Originality/value SMEs' customers and suppliers are their main sources of information compared to large firms, which have greater resources to search for and acquire information. This paper investigates the information exchanged by SMEs with their main customers and suppliers from a strategic focus by adding to the literature the concept of arcs of communication. It also has the added value of applying the Rasch Measurement Theory (Rasch, 1960/1980).