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Financial institutions are increasingly dependent on third-party service providers (TPSPs), raising concerns about systemic risks due to limited transparency. While the EU and U.K. have introduced formal oversight regimes, the U.S. relies on industry cooperation and micro-prudential supervision. A recent case study highlights financial stability risks from a payments disruption linked to a TPSP. As rapid technological change reshapes the financial sector, vulnerabilities from TPSP concentration and interconnectedness may grow. Greater understanding is needed to assess these risks and inform potential oversight responses.

Managing cyber risk in the supply chain is a major challenge in cybersecurity. Organizations struggle to evaluate suppliers' security postures, while suppliers face challenges in communicating these postures. This study, using interviews and surveys, formulates a process theory for supplier cyber risk assessment, highlighting the importance of secure technology. The findings provide actionable insights for improving supply chain cyber risk management.