Gerber owns over 2, units of Blackrock stock worth over $,, and over the last 20 years he sold BLK stock. Go see the world with Go Next, a leader in alumni and group travel. Gerber owns over 2, units of Blackrock stock worth over $,, and over the last 20 years he sold BLK stock. Book your next cruise or land program with Go Next! Go Next. . Milhão dollars as of 1 August Mr. Book your next cruise or land program with Go Next! Go Next. Gerber owns over 2, units of Blackrock stock worth over $,, and over the last 20 years he sold BLK stock. Milhão dollars as of 1 August Mr. Go see the world with Go Next, a leader in alumni and group travel. Milhão dollars as of 1 August Mr. Book your next cruise or land program with Go Next! Go Next. Go see the world with Go Next, a leader in alumni and group travel.