James Cargill II net worth: James Cargill II is an American businessman who has an estimated net worth of $2.4 billion dollars. Born in Birchwood, Wisconsin, James Cargill, II is one of the members of the very wealthy, and very low profile Cargill Family. The members of the family are heirs to the largest privately held corporation in the United States. William W. Cargill started the Cargill Company in Iowa, in the late 1800s. James Cargill II is his great-grandson. The company began as a grain storage business, but has since diversified into food production, risk management, commodities trading, and cattle. Until 1995, the company always had a CEO that was a member of the family, but as members of the family aged, and passed away, they were finally forced to pass on the reins. The members of the family still own 90% of the company, but their actual wealth is not known, since as a privately owned company, they are not required by law to report their wealth.