Other transactions that had no effect on the composition of the Group T-Mobile US share buy-back program Under the share buy-back program launched in December 2017, T-Mobile US acquired further common stock for an amount of USD 1.1 billion (EUR 0.9 billion) in the first half of 2018. Including the common stock acquired prior to that date, the total volume of shares repurchased under the share buy-back program amounts to USD 1.5 billion (EUR 1.3 billion). In addition, in the first quarter of 2018, Deutsche Telekom purchased shares in T-Mobile US on the capital market for a total amount of USD 0.2 billion (EUR 0.2 billion). As a result, Deutsche Telekom holds around 63 percent of the shares in the company. On April 27, 2018, T-Mobile US’ Board of Directors authorized an increase in the total share buy-back program to up to USD 9.0 billion, consisting of the USD 1.5 billion in repurchases already executed and for up to an additional USD 7.5 billion of T-Mobile US common stock until the end of 2020. The additional buy-back authorization is contingent upon the termination of the business combination agreement with Sprint. Acquisition of OTE shares In March 2018, Deutsche Telekom exercised its right of first refusal as invited by the Greek privatization authority Hellenic Republic Asset Development Fund (HRADF) and acquired a 5 percent stake in its Greek subsidiary OTE. The transaction was consummated in May 2018 through the acquisition of additional shares in the amount of EUR 0.3 billion. As a result, Deutsche Telekom AG holds around 45 percent of the company’s shares.