An originator institution may calculate the risk-weighted exposure amounts in respect of a securitisation position in accordance with Articles 260, 262 or 264, as applicable, where the following conditions are met:
(a) the securitisation meets the requirements for STS securitisation set out in Chapter 4 of Regulation (EU) 2017/2402 as applicable, other than Article 20(1) to (6) of that Regulation;
(b) the position qualifies as the senior securitisation position;
(c) the securitisation is backed by a pool of exposures to undertakings, provided that at least 70 % of those in terms of portfolio balance qualify as SMEs within the meaning of Article 501 at the time of issuance of the securitisation or in the case of revolving securitisations at the time an exposure is added to the securitisation;
(d) the credit risk associated with the positions not retained by the originator institution is transferred through a guarantee or a counter-guarantee meeting the requirements for unfunded credit protection set out in Chapter 4 for the Standardised Approach to credit risk;
(e) the third party to which the credit risk is transferred is one or more of the following:
(i) the central government or the central bank of a Member State, a multilateral development bank, an international organisation or a promotional entity, provided that the exposures to the guarantor or counter-guarantor qualify for a 0 % risk weight under Chapter 2;
(ii) an institutional investor as defined in point (12) of Article 2 of Regulation (EU) 2017/2402 provided that the guarantee or counter-guarantee is fully collateralised by cash on deposit with the originator institution.