The Member States shall require any natural or legal person who proposes to dispose, directly or indirectly, of a qualifying holding in a credit institution first to inform the competent authorities, telling them of the size of his intended holding. Such a person shall likewise inform the competent authorities if he proposes to reduce his qualifying holding so that the proportion of the voting rights or of the capital held by him would fall below 20 %, 33 % or 50 % or so that the credit institution would cease to be his subsidiary.