This paper aims to investigate how stakeholder groups engaged by the company contribute to the value flow of business models for sustainability. The research aims to expand the knowledge on business models for sustainability by highlighting the most important contributions of stakeholders that are relevant from a value flow and sustainable development perspective. The research methodology is a multiple case study in five Italian B corporations. The paper contribution is a stakeholder value flow model of business models for sustainability that categorizes the stakeholders engaged in the specific value flow dimension, namely, value intention, value proposition, value creation, value delivery and value capture. The stakeholder value flow model can facilitate a systematic and deeper analysis of stakeholder contributions to the company business model. Moreover, the stakeholder value flow model can be used to map from the company perspective the most significant relationships and to facilitate the stakeholder engagement towards sustainable development.

Despite the high number of active small and medium enterprises (SMEs) in all sectors, current studies have barely developed investigations on the sustainability of their business models so far. The aim of this study was thus to bridge the gap between sustainable business models of SMEs in the service industry, to uncover the challenges that SMEs face when seeking business model reconfiguration toward sustainability. More specifically, the empirical investigation adopted a case study research design in the context of yacht tourism, as one business form among many within the tourism industry and thus within the broader category of the service industry. Interviews were conducted with seven European SMEs, whose business models were analyzed through the lens of the triple bottom line and sustainability challenges in their business models. The results display a varied typology of case studies, where business model components reveal diverse expressions of facing sustainability challenges. The work discusses reported findings with a cross-case comparison among detected business models and outlines a list of propositions for sustainable business models of SMEs. The paper contributes in continuing the discourse on sustainable business models, adopting the perspective of the challenges for SMEs and offers food for thought for managers of SMEs in comparing their own business with the identified business model types.