1. Where an issuer of shares admitted to trading on a regulated market acquires or disposes of its own shares, either itself or through a person acting in his own name but on the issuer's behalf, the home Member State shall ensure that the issuer makes public the proportion of its own shares as soon as possible, but not later than four trading days following such acquisition or disposal where that proportion reaches, exceeds or falls below the thresholds of 5 % or 10 % of the voting rights. The proportion shall be calculated on the basis of the total number of shares to which voting rights are attached.
2. The Commission shall adopt, by means of delegated acts in accordance with Article 27(2a), (2b) and (2c), and subject to the conditions of Articles 27a and 27b, measures in order to take account of technical developments on financial markets and to specify the requirements laid down in paragraph 1.