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Image: Kelland, Philip, 1808-1879 Tait, Peter Guthrie, 1831-1901 Knott, Cargill Gilston, 1856-1922 | Public domain | via Wikimedia Commons

Cargill MacMillan III

CEO, Cargill
UNITED STATES
Real-Time Net Worth
$1.705B
Estimated based on Cargill stock value as of April 20, 2026
0% (24h)
Age
66
Source
Cargill
Industry
food-beverage
Citizenship
UNITED STATES

Biography

Cargill MacMillan III is one of 21 billionaire heirs to Cargill, the largest privately held company in the United States. Born in 1959, he is 66 years old as of March 25, 2026. The source of his wealth is Cargill, the multinational food corporation founded by his great-great-grandfather W.W. Cargill in 1865. Throughout his career, MacMillan has contributed to the family's legacy, which has led to the Cargill-MacMillan family becoming the fourth-wealthiest family in America. Cargill, with $154 billion in revenue in 2025, operates across food, agriculture, financial, and industrial divisions. The family's influence extends through its 88% ownership of the company.

Fact Checked
Verified by Editorial Team
Live Data
Updated 4/20/2026

Wealth Over Time

In-Depth Profile

Early Life

Cargill MacMillan III was born into a family with a long history in the agricultural business. His great-great-grandfather, W.W. Cargill, founded Cargill in 1865, starting with a single grain warehouse. The company has grown into a global leader in the food and agriculture industries.

Rise to Success

MacMillan III, as one of the heirs to this vast fortune, has benefited from the success of Cargill. While specific details of his career path are not widely publicized, his role as a family member and shareholder has allowed him to contribute to the company's long-term strategic focus. The family's ownership structure allows for decisions unaffected by short-term market pressures.

Key Business Strategies

The Cargill-MacMillan family's strategy centers on maintaining the private status of Cargill, which allows for long-term investments and a focus on sustainable growth. The family takes approximately 18% of the net profits as dividends each year. The family's influence is evident through the six family members on the board of directors.

Philanthropy

Cargill's commitment to nourishing the world extends to its corporate giving program. The company contributes to various national and global nonprofit organizations. The WEM Foundation, started by Whitney MacMillan, the former CEO of Cargill, supported various philanthropic causes, including education, arts, and social welfare.

Career Milestones

1955

Began Career at Cargill

John Hugh MacMillan III started working for Cargill, following in the footsteps of his family, with positions in various locations.

2007

Forbes Billionaire Ranking

Forbes estimated John MacMillan III's net worth at $1.7 billion.

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