LeaderPortfolio
MacMillan
William MacMillan
Rank #2369
UNITED STATESfood-beverageCargill

William MacMillan

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

How to read William MacMillan'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 William MacMillan, 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

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 Timeline

1930-2006

Board Member

Served as a board member of Cargill for three decades.

1953

Joined Cargill

Joined Cargill, a privately held global food corporation.

Philanthropic Impact

Global ReliefUndisclosed

Cargill's Philanthropic Efforts

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

Key Business Ventures & Holdings

CompanyStakeValue
Cargill90.00%

Net Worth History

In-Depth Analysis

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.

Data Sources & Methodology

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