On 29 July 2025, the Prudential Regulation Authority reissued the 2024 Other Systemically Important Institutions (O-SII) buffer rates for ring-fenced banks (RFBs) and large building societies to reflect the Financial Policy Committee’s updated O-SII buffer framework.
The revised 2024 O-SII buffer rates are based on the average of quarter-end UK leverage exposure measure data over 2023 – assessed on a sub-consolidated basis for RFBs, and on a consolidated basis for building societies – and will apply from 1 January 2026.