NetWorth
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III
C
Rank #2369
UNITED STATES•food-beverage•Cargill

Cargill MacMillan III

Net Worth
$1.716B
0% (24h)
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.

How to read Cargill MacMillan III's profile

Public net-worth figures are estimates. They combine observable inputs—typically listed equity, disclosed transactions, and market prices—with editorial judgment where filings are incomplete (for example, private holdings, debt, or cross-holdings). For Cargill MacMillan III, we anchor the narrative to Cargill, Incorporated and Cargill, then update the headline number as markets move. The chart on this page is meant to show trajectory, not a certified balance sheet.

When you see $1.716B alongside global rank #2369, interpret it as our best synthesis of widely cited ownership and price signals—not a claim about cash on hand. Estimates can diverge from other publishers because of different treatment of options, trusts, charitable vehicles, or illiquid assets. We document the general approach in methodology and welcome corrections via corrections.

Country (UNITED STATES) and career milestones on this page are curated for reader context; they should be verified against primary sources when used for research. Editorial metadata for this profile is refreshed on a rolling basis, with deeper audits at least annually (last noted cycle: 2026).

Looking for depth? When available, the dossier and timeline sections below add long-form context beyond the headline number—prioritize those modules when evaluating claims about strategy, controversies, or philanthropic commitments.

The Full Dossier

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 Timeline

2007

Forbes Billionaire Ranking

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

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.

Key Business Ventures & Holdings

CompanyStakeValue
Cargill90.00%—

Net Worth History

In-Depth Analysis

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.

Data Sources & Methodology

Figures for Cargill MacMillan III are synthesized from the sources below and cross-checked against our net worth methodology. Estimates may lag market moves; see corrections to report discrepancies.

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