May 26 : Dropbox said on Tuesday that CEO and co-founder Andrew Houston will step down after a transition period, promoting insider Ashraf Alkarmi to co-CEO ahead of his succession as the sole chief executive. The file hosting service provider's shares fell more than 1 per cent in early trading. They have fallen over 3 per cent this year. Here are some details: • Following a transition period, Alkarmi will become sole CEO and Houston will move into the role of executive chairman. CNA Games