38 major financial firms simulate global cloud outage
Thirty-eight systemically important financial institutions tested their defenses against a global cloud outage during SIMEX26 on October 8, 2026. The biennial exercise brought lenders together with UK authorities to test the sector's operational resilience.
Live coordination across 38 systemic entities
Hosted by the London Stock Exchange Group and opened by Economic Secretary Lucy Rigby, SIMEX26 brought together the UK's 38 largest banks and market infrastructure operators.
The exercise tested sector readiness against global disruption to cloud computing architecture.
Co-chaired by the Bank of England and UK Finance, the drill included HM Treasury and the Financial Conduct Authority alongside systemic firms.
The scenario triggered a live meeting of the Cross Market Business Continuity Group to coordinate sector-level steering.
Katharine Braddick, Deputy Governor at the Bank of England, noted that “preparedness is essential to safeguarding financial stability.”
Authorities now expect firms to update recovery plans.
From individual cyberattacks to vendor concentration
The SIMEX program tests collective resilience against systemic disruptions on a biennial cycle.
Previous exercises in 2022 and 2024 simulated a major cyber incident targeting an individual bank and critical infrastructure failures outside the financial sector.
SIMEX26 expands the focus toward third-party dependencies, reflecting regulatory efforts to oversee cloud concentration and artificial intelligence adoption.
The scenario was designed alongside technical experts rather than triggered by a live threat, utilizing the existing Sector Response Framework.
Reassurance without redundancy
Tabletop exercises expose procedural friction, but they cannot replicate an actual hyperscaler collapse.
Testing communication protocols confirms bureaucratic alignment while leaving acute cloud concentration unresolved.
Without structural backup systems, sector drills deliver administrative reassurance rather than genuine resilience.