(Reuters) -Billionaire investor Bill Ackman's Pershing Square Capital Management will buy 9 million newly issued shares of real estate developer Howard Hughes Holdings for $900 million, the companies said on Monday.

Billionaire investor Bill Ackman said on Monday that he raised his stake in real estate company Howard Hughes, realizing a long-held dream of creating a diversified holding company modeled after legendary investor Warren Buffett’s Berkshire Hathaway.

Pershing Square Holdings, Ltd. (LN:PSH) (LN:PSHD) today noted that its investment manager, Pershing Square Capital Management, L.P. (the "Investment Manager"), the Investment Manager’s holding company,