1. A CCP shall regularly review the models and parameters adopted to calculate its margin requirements, default fund contributions, collateral requirements and other risk control mechanisms. It shall subject the models to rigorous and frequent stress tests to assess their resilience in extreme but plausible market conditions and shall perform back tests to assess the reliability of the methodology adopted. The CCP shall obtain independent validation, shall inform its competent authority and ESMA of the results of the tests performed and shall obtain their validation in accordance with paragraphs 1a, 1b, 1c, 1d and 1e before adopting any significant change to the models and parameters.
The adopted models and parameters, including any significant change thereto, shall be subject to an opinion of the college in accordance with the following paragraphs.
ESMA shall ensure that information on the results of the stress tests is passed on to the ESAs, the ESCB and the Single Resolution Board t
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