Since November 2012 dos Santos is a non-executive board member of ZON. In December 2012, dos Santos announced the invitation for a merger of ZON with Sonaecom, proved in March 2013 by the General Assembly. Eight months later, after the green light from the Competition Authority, the merger of the two companies was formalized on 27 August 2013, with the transfer to ZOPT, a special purpose vehicle created to advance the operation which became the owner of more 50% of the capital of the new group, the shares that dos Santos and Sonaecom hold on Zon and Optimus respectively. There was a capital increase of ZOPT through contribution in kind from 50 to 716 million euros, while Sonaecom subscribed 358 million shares of the company, by delivering 81.8% of its stake in Optimus. The Angolan businesswoman, on her turn, subscribed exactly the same number of shares of ZOPT, through her holdings Kento and Unitel International, delivering 28.8% of the stake in ZON. With this transfer of shareholdings in Optimus and Zon, Sonaecom and dos Santos became holders of over 50% stake in the merged company: Zon Optimus SGPS. On this occasion, a new strategy for the company was announced by dos Santos, with a multimarket vision. On 1 October 2013, dos Santos attended the first General Assembly of Zon Optimus. Isabel dos Santos' investments in Portugal are in listed companies, which are therefore subject to official supervision of the Portuguese Securities Market Commission (CMVM).