Skip to content
Billionaire Profile
William MacMillan
Global Rank
#2636

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

William MacMillan

CEO, Cargill
Information not available
Real-Time Net Worth
$1.52B
Estimated based on Cargill stock value as of September 10, 2026
0% (24h)
Age
71
Source
Cargill
Industry
food-beverage
Citizenship
United States

Biography

William MacMillan is one of the billionaire heirs to Cargill, the world's largest agricultural business, a privately held multinational corporation. As a descendant of William Wallace Cargill, the founder of Cargill in 1865, William MacMillan is a part of the Cargill-MacMillan family that holds a significant stake in the company. He is known for his involvement with Cargill, and his estimated net worth reflects his position within this influential family and the company's expansive operations.

AI-Assisted Draft
Not yet reviewed by an editor — how we work
Data Updated
Sep 10, 2026
Report a Correction

Wealth Over Time

Net Worth History

YearNet Worth
2026$1.52B
2025$1.70B
2024$1.70B

In-Depth Profile

Early Life

William MacMillan was born into the Cargill-MacMillan family, one of the wealthiest families in the United States. His family's wealth originates from Cargill, a global leader in food, agriculture, financial, and industrial products and services. The company was founded in 1865 by William Wallace Cargill, William's great-great-grandfather, as a grain warehouse.

Rise to Success

William MacMillan's career and achievements are closely tied to Cargill. While specific details about his direct role and career path within Cargill are not widely available, it is known that he is one of the many descendants who have maintained the family's significant stake in the company. The Cargill-MacMillan family has a history of maintaining a low profile, focusing on the long-term growth and stability of the business.

Key Business Strategies

Cargill's key business strategies include continuous innovation, diversification, and a focus on global markets. The company operates in over 70 countries and has expanded beyond its initial grain storage business into various sectors. Cargill has also emphasized sustainability, implementing initiatives to address deforestation and promote ethical sourcing. The family's strategy involves reinvesting a large portion of the company's net income annually, ensuring long-term investments and growth.

Philanthropy

The Cargill-MacMillan family has contributed to several philanthropic causes. While specific details about William MacMillan's personal philanthropy are not readily available, the family has a history of supporting various charitable and educational institutions. The Cargill Foundation also engages in initiatives to advance food security, climate resilience, and economic opportunity.

Career Milestones

1953

Joined Cargill

Joined Cargill, a privately held global food corporation.

1930-2006

Board Member

Served as a board member of Cargill for three decades.

Philanthropy & Social Impact

Global Relief

Cargill's Philanthropic Efforts

Undisclosed

Cargill has been involved with philanthropic efforts, contributing funds to support employees and global relief initiatives.

Business Philosophy & Leadership

Notable Quotes

"Information not available"

Leadership Principles

Commitment to Long-Term Growth

The Cargill-MacMillan family focuses on the long-term growth and stability of the business.

Focus on sustainability

Cargill is working on sustainability by addressing deforestation and promoting ethical sourcing.

Controversies & Challenges

Land Grabbing

Between 2010 and 2012, Cargill brought large areas of land in Colombia under its control despite legal restrictions on acquiring state land.

Billionaires Connected to William MacMillan

Peers in Food-Beverage

All Food-Beverage billionaires

Richest in United States

All billionaires from United States

Adjacent Global Ranks

Full global ranking

Frequently Asked Questions

What is William MacMillan's net worth in 2026?
As of 2026, William MacMillan's estimated net worth is $1.515 billion, ranking #2636 among the world's billionaires. The estimate is based on publicly available shareholding data and market prices, updated daily.
How did William MacMillan make their money?
William MacMillan's wealth primarily comes from Cargill, most notably through Cargill.
Where is William MacMillan from?
William MacMillan is from United States.
How old is William MacMillan?
William MacMillan is 71 years old.

Sources & References

Citations for this profile have not been published yet. Net worth figures here are estimates and should not be treated as verified. See our methodology for how these estimates are produced, or report a correction.