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Billionaire Profile
William MacMillan
Global Rank
#2295

Image: U.S. District Court for the District of Massachusetts. 1789 | Public domain | via Wikimedia Commons

William MacMillan

CEO, Cargill
UNITED STATES
Real-Time Net Worth
$1.708B
Estimated based on Cargill stock value as of March 6, 2026
0% (24h)
Age
71
Source
Cargill
Industry
food-beverage
Citizenship
UNITED STATES

Biography

William MacMillan, born in 1930, is an heir to Cargill, the world's largest private company. His wealth stems from his family's long-standing ownership in the agricultural giant, a business founded in 1865. As of early 2025, his net worth is estimated at $1.6 billion. MacMillan's career involved decades of service as a board member of Cargill. Cargill's revenue reached $154 billion in the fiscal year ending May 2025. MacMillan's expertise and contributions have helped shape Cargill's success.

Fact Checked
Verified by Editorial Team
Live Data
Updated 3/6/2026

Wealth Over Time

In-Depth Profile

Early Life

William Duncan MacMillan, born on July 5, 1930, was the son of John H. MacMillan, Jr. and Marion Dickson. He graduated from the Berkshire School and later received his bachelor's degree from Brown University in 1953. He demonstrated his commitment to education through philanthropic contributions, including funding scholarships and supporting the construction of the W. Duncan MacMillan Hall at Brown University.

Career

MacMillan dedicated three decades of his career to serving on the board of Cargill. He was also known for leading several companies, some of which he established himself. His role as a director at Cargill reflects his significant involvement in the company's operations and strategic decisions.

Personal Life

MacMillan was married twice. His first wife, Sarah Stevens, passed away in 1995, and they had four daughters: Sarah MacMillan, Katherine Tanner, Lucy Stitzer, and Alexandra Daitch. He later married Nivin.

Death

William Duncan MacMillan died on October 31, 2006, at the age of 76, in Jupiter, Florida, due to an apparent heart attack.

Career Milestones

1953

Graduated

Graduated from Brown University.

Unknown

Cargill Board Member

Served on the board of Cargill for three decades.

2006

Death

Died October 31, 2006

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