The new agreement, which gives Nestle a 99-year license for use of the Haagen-Dazs brand in the U.S. and Canada, was triggered by General Mills' recently completed acquisition of Pillsbury.
Ice Cream Partners USA had sales of roughly $700 million in 2000, according to Nestle.
The Wolf Group, New York, handles advertising for Haagen-Dazs.
Nestle did not comment on whether it would shift the brand to one of its roster agencies, among them Publicis Groupe's Publicis, Dallas, and Interpublic's McCann-Erickson Worldwide.
Editor's Note: A previous version of this story incorrectly reported that Interpublic Group of Cos.' Foote, Cone & Belding, Worldwide, San Francisco, handled the Haagen-Dazs account.