Billionaire hedge fund manager Bill Ackman announced plans to build a modern-day Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B). Although Ackman and his investors would own most of it, it would be available to invest in as a publicly traded company.

Ackman has unveiled his vision to form a new business out of Howard Hughes Holdings “that would acquire controlling interests in operating companies.”