A set of philanthropies created by Margaret A. Cargill, an heir to the Cargill Corporation who died in 2006, could soon become, collectively, the third-wealthiest grant maker in the United States.
The infusion of money—which could total roughly $9-billion—would come as part of a deal that is expected to enable the philanthropies to convert illiquid shares in the private Cargill Corporation, left to them by Ms. Cargill, into shares in Mosaic, a public company owned largely by Cargill, an international agricultural, food, and financial company.
