William MacMillan

Net Worth

$1.452B

0% (24h)

William MacMillan is a member of the Cargill-MacMillan family, one of the wealthiest families in the United States, with a significant stake in Cargill, the largest private company in America and the world's biggest food corporation. He has been associated with Cargill for many years. As of December 2025, his net worth is estimated to be $1.5 billion, reflecting his position as an heir to the Cargill fortune. MacMillan's wealth stems from his ownership in Cargill, a company founded by his great-great-grandfather in 1865. Over the years, he has witnessed and contributed to Cargill's expansion across various sectors, including food, agriculture, and financial services. William MacMillan is a member of the Cargill-MacMillan family, one of the wealthiest families in the United States, with a significant stake in Cargill, the largest private company in America and the world's biggest food corporation. His wealth has been built through the family's long-standing ownership of Cargill, which has played a critical role in the global food supply chain. He has no known involvement in the company's operations.

The Full Dossier

Early Life

William Duncan MacMillan was born on July 5, 1930, in Minneapolis, Minnesota. He is the son of John H. MacMillan, Jr., and Marion Dickson. He graduated from Brown University in 1953.

Rise to Success

William MacMillan had a successful career, most notably as a director of Cargill for three decades. He joined Cargill in 1953 and was instrumental in the company's growth. He was also involved in other companies and wrote the MacMillan-Cargill family history. William MacMillan is one of 12 billionaire heirs to Cargill, the world's biggest agriculture business.

Key Business Strategies

The Cargill-MacMillan family collects an estimated 18% of net profits as dividends every year. The family’s strategy focuses on long-term investments and the prioritization of the company remaining private.

Philanthropy

William Duncan MacMillan donated millions of dollars to various charities and educational institutions. There is no exact amount available.

Career Timeline

1930-2006

Member of the MacMillan Family

Part of the founding family of Cargill.

1953-2006

Board Member of Cargill

Served as a board member for three decades.

1953

Joined Cargill

Began his career with Cargill, a privately held global food corporation.

Philanthropic Impact

CharityUndisclosed

Various Charities

Donated to charities and educational institutions. There is no exact amount available.