This research introduces a novel integrated model that affiliates the innovative capacity of circular start-ups, as seen through their network-building capabilities, with the influential attribute of top management support as outlined in the T-O-E theory. The investigation employs a quantitative research methodology based on a random sampling technique for the entire research population. The structural equation model, utilizing SMARTPLS, is used on a dataset comprising 231 manufacturing-based circular start-ups and their franchises in India. The findings reveal significant direct and indirect relationships between network-building capabilities and the innovation function of circular start-ups. The study highlights the pivotal role of top management support, following the T-O-E framework, as a complete mediator between network-building capabilities and organizational innovativeness. This inquiry establishes that effective networking and other factors confer a competitive edge upon firms. Furthermore, it contributes to the literature on the circular economy within emerging markets, offering insights applicable across various sectors like IT, hospitality, aviation, pharmaceuticals, and more. The study's implications extend to future researchers and policymakers, advocating for adopting a multi-level perspective to foster and ensure the innovativeness of circular start-ups in diverse industries.