1.For the purpose of calculating the risk-weighted exposure amount of an unrated securitisation position an institution may apply the weighted-average risk weight that would be applied to the securitised exposures under Chapter 2 by an institution holding the exposures, multiplied by the concentration ratio referred to in paragraph 2. For this purpose, the institution shall know the composition of the pool of securitised exposures securitised at all times.
2.The concentration ratio shall be equal to the sum of the nominal amounts of all the tranches divided by the sum of the nominal amounts of the tranches junior to or pari passu with the tranche in which the position is held including that tranche itself. The resulting risk weight shall not be higher than 1 250 % or lower than any risk weight applicable to a rated more senior tranche. Where the institution is unable to determine the risk weights that would be applied to the securitised exposures under Chapter 2, it shall apply a risk weight of 1 250 % to the position.
1.Where a securitisation position is assigned a 1 250 % risk weight under this Section, institutions may deduct the exposure value of such position from Common Equity Tier 1 capital in accordance with point (k) of Article 36(1) as an alternative to including the position in their calculation of risk-weighted exposure amounts. For that purpose, the calculation of the exposure value may reflect eligible funded credit protection in accordance with Article 249.
2.Where an institution makes use of the alternative set out in paragraph 1, it may subtract the amount deducted in accordance with point (k) of Article 36(1) from the amount specified in Article 268 as maximum capital requirement that would be calculated in respect of the underlying exposures as if they had not been securitised.