Sarah MacMillan

Biography

Sarah MacMillan is a 71-year-old American heiress, deriving her wealth from Cargill, the largest private company in the United States. Her estimated net worth is $2.2 billion. Inheriting her stake in Cargill in 2006 from her father, William Duncan MacMillan, she is one of the four billionaire sisters who inherited stakes in the company. Despite not being involved in the company's operations, her wealth fluctuates with Cargill's financial performance. She is also known for her philanthropic work and serves as the President of the McMillan Family Charitable Foundation, which focuses on improving the lives of women.

In-Depth Profile

Early Life

Sarah MacMillan was born in the United States. She is one of four sisters who inherited stakes in Cargill from her father, William Duncan MacMillan, who died in 2006. Her great-great-grandfather, W.W. Cargill, founded the business in 1865.

Rise to Success

Sarah MacMillan's wealth stems from her 3% ownership in Cargill, a company her family has been involved with for generations. Cargill, founded in 1865, is the largest private company in the United States and the biggest food company globally. The family still owns roughly 90% of Cargill.

Key Business Strategies

Sarah MacMillan is not directly involved in the operations of Cargill. The company, however, has a strong market presence and has expanded to 70 countries. The company saw $154 billion in revenue in fiscal year 2025. The family continues to benefit from the company's performance.

Philanthropy

Sarah MacMillan is the President of the McMillan Family Charitable Foundation, which focuses on improving the lives of women.