This paper presents a longitudinal case study examining why and how commercial banks sought to integrate sustainability issues into their project finance operations between 2003 and 2008. We study the evolution of a set of influential environmental and social risk management guidelines for project finance – the Equator Principles (EP) – and the simultaneous structuration of a field around these guidelines focused on the issue of socially accountable project finance. The case is theoretically framed using Hoffman’s (1999) concept of an issue-based field and associated conceptualisations of the role of internal and external (social) movements in the structuration of these fields. The structuration of the issue-based field studied is shown to encompass a dynamic, contested process involving extensive interactions between a non-governmental organization (NGO) movement and a commercial bank movement. We unveil how the conflicting, collective rationales and actions of both movements fuelled the structuration process and facilitated an evolution in the social accountability of commercial banks. While prior work sees little potential for civil society actors to engage with and move corporate social responsibility and reporting in a more challenging direction, we reveal how the NGO movement evoked a progression in social responsibility and reporting in a sector that had previously shown little inclination to address its wider social accountability. Drawing on our case analysis, we theorize how issue-based fields cohere and crystallise, particularly how they build an institutional infrastructure based upon the infrastructure of the mature field which they straddle and which the relevant issue impacts upon.

The rise of independent oversight of the accounting profession has attracted considerable research attention. Much of this research has studied how professional accounting bodies and the Big 4 firms have shaped the mandate and capabilities of independent oversight bodies. Less is known about how independent oversight has affected the workings of professional accounting bodies, particularly their capacity to simultaneously govern and represent their members. This paper advances our understanding of this dynamic through a longitudinal, interpretive case study of how the Dutch professional accounting body, the NBA (the Royal Netherlands Institute of Chartered Accountants), adapted and developed its regulatory intermediary role during a lengthy period of intense oversight by the Dutch regulator, the AFM (the Authority for the Financial Markets), and shifting levels of Big 4 firm discord. Drawing on extensive archival materials and insights gained from in‐depth interviews with key participants, the study advances existing theorizations of the work of regulatory intermediaries by highlighting both their functional variability and fragility. In responding to recurring crises and critique, the NBA's intermediary role shifted from facilitation to curation and ultimately to orchestrating the Big 4 firms' regulatory response. Such shifts were neither smooth nor predictable—characterized by a sense of “role limbo” as the NBA battled to bolster its identity and authority when sidelined by the AFM or dictated to or impeded by the Big 4 firms. In examining such shifting intermediation and contesting levels of influence, the NBA's governance and representation functions emerge as more symbiotic than oppositional, with the NBA using its fulfillment of one as a means of strengthening its execution of the other. Overall, the paper's analysis uncovers the functional fragility of the NBA, which questions whether repeated calls for professional accounting bodies to rediscover their public interest mandate have adequately appreciated the complex, contested nature of the regulatory environment in which they operate.

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