# The Capital Buffers and Macro-prudential Measures Regulations 2025, Regulation 16: Power for the PRA to require an O-SII buffer to be maintained


(1) The PRA may require a relevant O-SII to maintain Common Equity Tier 1 capital, to be known as an “O-SII buffer”.
(2) The amount of capital which the PRA may require a relevant O-SII to hold (“the buffer rate”) must be expressed as a percentage of the relevant O-SII’s total risk exposure amount calculated in accordance with Article 92 (own funds requirements) of the Capital Requirements Regulation.
(3) In this regulation, “Common Equity Tier 1 capital” has the meaning given in Article 50 (common equity tier 1 capital) of the Capital Requirements Regulation.

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Source: https://www.legislation.gov.uk/uksi/2025/653/regulation/16 (the official version)
Page: https://openlegislation.uk/capital-buffers-and-macro-prudential-measures-regulations-2025/regulation-16
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.