Purpose This study seeks to comprehend how sociomateriality influences the openness paradox within the context of open strategising.Design/methodology/approach We adopted a qualitative approach and developed a case study as a research method. The data included 10 semi-structured interviews, direct observation and documentary analysis, including virtual documents, collaborative platforms and communication systems.Findings We found that sociomateriality influences the transition between openness and closure in open strategy (OS) dimensions, namely inclusion, participation and transparency, once organisational practitioners actively build on social relationships and engage with material elements within this paradoxical context.Research limitations/implications The primary limitation was the challenge of managing extensive data, especially tracking all meetings and interactions. Nonetheless, we aimed to provide a comprehensive view and meaningful insights from the data. Future research could employ mixed methods to achieve a more holistic understanding of the phenomenon.Practical implications By understanding the role of formalisation and legitimation played by sociomateriality during open strategising, practitioners can navigate the complexities of balancing openness and closure, fostering innovation and engagement while ensuring the legitimacy of strategising. Recognising the coexistence of exclusions in social practices enables society to comprehend this paradox and highlight the need to address it, fostering an inclusive environment and promoting balanced openness in various social contexts.Originality/value Our study contributes to the OS literature by highlighting the role of sociomateriality in shaping the openness and closure interplay. Additionally, we emphasise the importance of formalisation and legitimation practices involving materiality in the balance between openness and closure in a context where openness is deemed essential for strategic success.
