Martha MacMillan

 Cargill

• Martha MacMillan is one of 12 billionaire heirs to Cargill, the world’s biggest agriculture business.
• Her great-great-grandfather, W.W. Cargill, founded the business as a single grain warehouse on the end of an Iowa railroad line in 1865.
• Net worth: $1.6 billion
• The family still owns roughly 90% of Cargill, which did $114.6 billion in 2020 sales across food, agriculture, financial and industrial divisions.
• The Cargill-MacMillan family collects an estimated 18% of net profits as dividends every year.