The Member States shall require any natural or legal person who has taken a decision to dispose, directly or indirectly, of a qualifying holding in a credit institution first to notify in writing the competent authorities, indicating the size of his intended holding. Such a person shall likewise notify the competent authorities if he has taken a decision to reduce his qualifying holding so that the proportion of the voting rights or of the capital held would fall below 20 %, 30 % or 50 % or so that the credit institution would cease to be his subsidiary. Member States need not apply the 30 % threshold where, in accordance with Article 9(3)(a) of Directive 2004/109/EC, they apply a threshold of one-third.