Billionaire Profile
John MacMillan
Global Rank
#2356

Image: Public domain | via Wikimedia Commons

John MacMillan

CEO, Cargill
US
Real-Time Net Worth
$1.5B
As of December 2025
Age
76
Source
Cargill
Industry
food-beverage
Citizenship
US

Biography

John MacMillan is one of the 12 billionaire heirs to Cargill, the world's largest private company. Born in Minneapolis, Minnesota, in 1928, John started his career with Cargill in 1955. Over the years, he held various positions within the company, contributing to its growth and expansion. As a descendant of the company's founder, W.W. Cargill, John's wealth primarily stems from his ownership stake in the food and agriculture giant. As of December 2025, his estimated net worth is $1.5 billion. He is also recognized for his philanthropic activities, contributing to various charities and organizations. John MacMillan passed away in 2008, leaving behind a legacy of business acumen and commitment to charitable causes.

Wealth Over Time

In-Depth Profile

Early Life

John Hugh MacMillan III was born in Minneapolis, Minnesota, on February 28, 1928. He was the son of John H. MacMillan Jr. and Marion Dickson. He grew up in Wayzata, Minnesota, and received his education at the Blake School, Berkshire School, West High School, and the University of Minnesota.

Rise to Success

John MacMillan's career began in 1955 when he joined Cargill, a company founded by his great-grandfather. He held several positions within the company, including roles in Great Falls, Montana, Baton Rouge, Louisiana, and Minneapolis. His career with Cargill allowed him to grow and develop his skills in the food and beverage industry.

Key Business Strategies

While specific details about his business strategies are not readily available, John MacMillan's success is tied to Cargill's overall performance. Cargill is known for its focus on agricultural commodities, food products, and financial and industrial services. The company has strategically expanded its operations across the globe, making it the largest privately held company in the United States.

Philanthropy

John MacMillan was also a philanthropist, supporting various charities and organizations throughout his life. Specific details on his philanthropic initiatives and the amounts donated are difficult to ascertain due to the private nature of the family.

Career Milestones

1955

Began working at Cargill

Started his career at Cargill, the family-founded company.

2007

Forbes Net Worth Estimate

Forbes estimated his net worth to be $1.7 billion.

Philanthropy & Social Impact

Charity

Various Charities

$XB

Donated to various charities and organizations.