(5)To ensure proportionality in determining the additional own funds requirement, risks and elements of risk not covered or not sufficiently covered by the K-factor requirement referred to in Article 15 of Regulation (EU) 2019/2033 should be measured only for those investment firms that are subject to the K-factor requirement referred to in that Article, and not for small and non-interconnected firms that meet the conditions set out in Article 12(1) of that Regulation. Other risks not covered at all by the own funds requirements set out in Parts Three and Four of Regulation (EU) 2019/2033, including risks explicitly excluded from those own funds requirements, exist for investment firms. Therefore, it is necessary to specify that those risks are assessed and measured by competent authorities on the basis of the size and business model of the invetsment firm as well as on the basis of the scope, nature and complexity of its activities.