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Billionaire Profile
Martha MacMillan
Global Rank
#2636

Image: Unknown photographer | Public domain | via Wikimedia Commons

Martha MacMillan

CEO, Cargill
Orono, Minnesota
Real-Time Net Worth
$1.52B
Estimated based on Cargill stock value as of September 10, 2026
0% (24h)
Age
75
Source
Cargill
Industry
food-beverage
Citizenship
United States

Biography

Martha MacMillan, born in 1951, is one of the 21 billionaire heirs to Cargill, the world's largest privately held agricultural business. Her great-great-grandfather founded the company in 1865 as a single grain warehouse. Today, the Cargill-MacMillan family collectively owns approximately 88% of Cargill. With a net worth of $1.7 billion as of March 25, 2026, Martha MacMillan is actively involved in philanthropy through the Martha Elizabeth MacMillan Foundation. The foundation focuses on international humanitarian relief, poverty alleviation, and local health initiatives.

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Data Updated
Sep 10, 2026
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Wealth Over Time

Net Worth History

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

In-Depth Profile

Early Life

Martha MacMillan is a member of the MacMillan family, who have been involved with Cargill for generations. Her great-great-grandfather, W.W. Cargill, founded the company in 1865. Growing up, she was exposed to the global nature of the family business.

Rise to Success

Martha MacMillan inherited her stake in Cargill, one of the world's largest privately held companies. The family has consistently maintained a significant ownership in the company, allowing for long-term strategic investments. She does not have an active role in the daily operations of the company. Her wealth stems from the family's long-standing ownership of Cargill, which has grown into a global giant with operations in food, agriculture, and industrial sectors.

Key Business Strategies

Cargill's success is rooted in its ability to adapt to changing markets and its commitment to remaining a privately held company. This structure allows Cargill to focus on long-term growth without the pressure of quarterly earnings reports. The company reinvests a significant portion of its earnings back into the business. Cargill has also expanded its global presence, with new facilities and sustainability initiatives.

Philanthropy

Martha MacMillan is actively involved in philanthropy through the Martha Elizabeth MacMillan Foundation. The foundation focuses on international humanitarian relief and poverty alleviation. The Martha Elizabeth MacMillan Foundation is based in Minneapolis, Minnesota. The foundation has assets of $15.6 million and focuses on large grants to established organizations. The foundation supports initiatives in several US cities and states, including Minnesota, Illinois, and New York.

Philanthropy & Social Impact

Humanitarian Aid

International Humanitarian Relief

$1.4B

Focuses on global poverty reduction via microfinance and economic empowerment.

Philanthropy

Immigrant recognition and heritage

$1.4B

Supports immigrant recognition and heritage programs.

Healthcare

Local Health System Support

$1.4B

Supports local health system support in Minnesota (Alina Health Foundation).

Business Philosophy & Leadership

Notable Quotes

""They want to draw the curtain down." (Referring to the privacy of Cargill family members)"

""A lot of rich people want to be on TV, want you to know who they are and that they own this and that. Not these people.”"

Billionaires Connected to Martha 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 Martha MacMillan's net worth in 2026?
As of 2026, Martha 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 Martha MacMillan make their money?
Martha MacMillan's wealth primarily comes from Cargill, most notably through Cargill.
Where is Martha MacMillan from?
Martha MacMillan is from United States.
How old is Martha MacMillan?
Martha MacMillan is 75 years old.

Sources & References

  1. Martha MacMillan — Forbes profile Forbes