Beginning this fall the Andy Warhol Foundation for the Visual Arts will disperse its entire collection of Warhols, donating some and selling others through Christie’s auction house as it shifts almost exclusively into a grant-making organization, foundation officials said in interviews.

The sales will take several years to complete and are expected to garner about $100 million, increasing the foundation’s endowment, from which it makes grants to nonprofit arts organizations.

Though the foundation no longer holds any big-ticket works by Warhol, it still possesses a bevy of paintings, prints, photographs and drawings, some of which the public has never seen. They include “Three Targets,” a large horizontal black-and-white canvas of paint and silk-screen depicting three targets with gunshots, expected to sell for $1 million to $1.5 million; a Jacqueline Kennedy collage from the 1960s, estimated at $200,000 to $300,000; and a “Self-Portrait in Fright Wig” from a ’70s Polaroid print, estimated at $15,000 to $20,000.

Under its unusual exclusive deal with Christie’s, to be announced Thursday, the foundation will sell some of the works through live auctions, the first on Nov. 12, supplemented by online auctions that will begin in February and private sales.