This chapter presents the results of a study conducted to assess the need for sector-specific, secondary-level sustainability standards designed for a distinct subsector of the financial system: the cooperative banking sector. Characterized by a dual mission encompassing both business objectives and social responsibilities, credit cooperative banks (CCBs) exemplify a hybrid organizational nature. Employing a qualitative, meaning-oriented content analysis, the study examines non-financial statements (NFSs) and other sustainability-related disclosures from the largest Italian cooperative banking group over the period 2017–2022. The findings reveal that generic sector-specific standards alone are insufficient to enhance adequately the quantity and quality of sustainability information relevant to key stakeholders within Italian microfinance institutions. Instead, a more nuanced, tailored reporting framework at a secondary sector level is imperative. This study contributes to ongoing discussions on the evolution of sustainability reporting by advocating not only for sector-specific standards but also for refined, secondary-level standards adapted to the heterogeneity inherent in certain industries.