His father , Yehuda Zisapel , is the largest shareholder , with a 15 percent stake .
Zisapel holds a 3.4 percent stake in the company .
Zisapel 's father , Yehuda Zisapel , is the largest shareholder , with a 15 percent stake .
Zisapel holds a 3.4 percent stake in the company .