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Billionaire Profile
James Duff
Global Rank
#976

Image: James Duff Brown, third edition edited and reqritten by W. C. Berwick Sayers | Public domain | via Wikimedia Commons

James Duff

CEO, Tires
Hattiesburg, Mississippi
Real-Time Net Worth
$4.47B
Estimated based on Tires stock value as of September 10, 2026
0% (24h)
Age
65
Source
Tires, diversified
Industry
Diversified
Citizenship
United States

Biography

James Duff (born 1961), a self-made billionaire, is the co-founder and co-owner of Duff Capital Investors. His source of wealth is in tires and diversified businesses. Along with his brother, Thomas Duff, James transformed the family's tire distribution business, originally founded in 1973 by their father Ernest R. Duff, into Southern Tire Mart. Southern Tire Mart is the largest truck tire dealer and retreader in the U.S., contributing significantly to his estimated net worth of $4.5 billion. Duff's career is marked by strategic acquisitions and business acumen that have established him and his brother as the wealthiest individuals in Mississippi.

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Data Updated
Sep 10, 2026
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Wealth Over Time

Net Worth History

YearNet Worth
2026$4.47B
2025$4.50B
2024$4.50B

Portfolio Holdings

Southern Tire Mart

Southern Tire Mart

diversified
Revenue
$4.00B
Columbia, Mississippi
6,000+ employees
Founded 1973

In-Depth Profile

Early Life

James Ernest Duff was born in 1961 in Columbia, Mississippi. His mother is Bobbie Baggett Duff, and his late father was Ernest Duff, a lawyer and businessman. Duff graduated from Columbia Academy and later studied business at Utah Valley University. He has three siblings: Thomas Duff, Stephen Duff, and Jane Duff Thomley.

Rise to Success

James's father, Ernest Duff, founded Southern Tire Mart in 1973. James and his brother Thomas worked in the business from a young age. In 1983, they took control of the struggling company. They sold the company in 1998 but repurchased it in 2003 for $15 million and rebranded it Southern Tire Mart. Under their leadership, Southern Tire Mart grew to become the largest truck tire dealer and retread manufacturer in the United States. The brothers co-founded Duff Capital Investors, a holding company with revenues of $6 billion.

Key Business Strategies

The Duff brothers focused on expanding Southern Tire Mart and diversifying into other industries through Duff Capital Investors. They acquired other businesses to generate growth and synergy with the original tire business. The brothers' success stems from their disciplined operations, focus on customer service, and strategic acquisitions.

Philanthropy

James Duff and his brother are prominent philanthropists committed to advancing education and community development in Mississippi. They have donated tens of millions to institutions like the University of Southern Mississippi, the University of Mississippi, and Mississippi State University. Notable contributions include a $30 million planned gift to USM in 2020 and $26 million to Ole Miss for the construction of the Jim and Thomas Duff Center for Science and Technology Innovation.

Career Milestones

1973

Southern Tire Mart Founded

Ernest Duff, James's father, founded the tire business.

1983

Took Control of Southern Tire Mart

James and Thomas Duff assumed control of the company.

2003

Reacquired and Rebranded Southern Tire Mart

The Duff brothers bought back the company and rebranded it.

2007

Duff Capital Investors Founded

James and Thomas Duff co-founded Duff Capital Investors.

2024

Purchased Dealerships

Duff Capital Investors bought dealerships in Mississippi.

Philanthropy & Social Impact

Education

University of Southern Mississippi

$30M

Planned gifts for scholarships.

Education

University of Mississippi

$26M

Donation to construct the Jim and Thomas Duff Center for Science and Technology Innovation.

Billionaires Connected to James Duff

Peers in Diversified

All Diversified billionaires

Richest in United States

All billionaires from United States

Adjacent Global Ranks

Full global ranking

Frequently Asked Questions

What is James Duff's net worth in 2026?
As of 2026, James Duff's estimated net worth is $4.472 billion, ranking #976 among the world's billionaires. The estimate is based on publicly available shareholding data and market prices, updated daily.
How did James Duff make their money?
James Duff's wealth primarily comes from Tires, diversified, most notably through Tires.
Where is James Duff from?
James Duff is from United States.
How old is James Duff?
James Duff is 65 years old.

Sources & References

  1. James Duff — Forbes profile Forbes