This inquiry examines the Indonesian banking sector from 2021 to 2024 and assesses whether board gender composition affects the financial implications of sustainability reporting. Methodologically, the study leverages SmartPLS 4 to conduct Structural Equation Modeling (SEM). The empirical results indicate that sustainability reporting, when viewed in isolation, does not materially affect corporate market performance. More critically, the analysis identifies a distinct dampening effect: increased gender diversity on boards appears to attenuate the association between sustainability disclosures and firm value. These outcomes lend empirical weight to the ‘over-monitoring’ hypothesis rooted in Agency Theory. From a managerial standpoint, the findings suggest that banking entities must carefully calibrate their disclosure mechanisms; otherwise, markets may misinterpret rigorous board oversight as an impediment to value creation rather than a safeguard.
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