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Billionaire Profile
Thomas Duff
Global Rank
#943

Image: original uploader was Baronplantagenet at en.wikipedia | CC BY-SA 3.0 | via Wikimedia Commons

Thomas Duff

CEO, Tires
UNITED STATES
Real-Time Net Worth
$4.455B
Estimated based on Tires stock value as of March 6, 2026
0% (24h)
Age
69
Source
Tires, diversified
Industry
Diversified
Citizenship
UNITED STATES

Biography

Thomas Duff is an American billionaire businessman and philanthropist, known for his significant contributions to Mississippi's business and philanthropic landscape. Born in 1956, Duff co-founded Duff Capital Investors with his brother, James Duff. Together, they built a diversified holding company with over 20 businesses, including Southern Tire Mart, the largest truck tire dealer in the United States. As of late 2025, his estimated net worth is $4.1 billion. Beyond his business achievements, Duff is also involved in public service and supports various Republican campaigns. He has been a major contributor to Republican campaigns in Mississippi, supporting figures such as Governor Tate Reeves and Donald Trump. Duff's career includes the successful management of Southern Tire Mart and the development of Duff Capital Investors into a multi-billion dollar holding company.

Fact Checked
Verified by Editorial Team
Live Data
Updated 3/6/2026

Wealth Over Time

In-Depth Profile

Early Life

Thomas Milton Duff was born on December 31, 1956, in Columbia, Mississippi. He was raised in a business-oriented family. His father, Ernest Duff, was a lawyer and a businessman, who owned a tire shop.

Rise to Success

Duff's journey to becoming a billionaire started with the family business, Southern Tire Mart. He and his brother, James Duff, took over the family's tire shop. Together, they built the business into the largest truck tire dealer and retread manufacturer in the United States. In 2007, the brothers co-founded Duff Capital Investors (DCI), a holding company that now manages more than 20 businesses across various sectors. The company's revenue exceeds $6 billion.

Key Business Strategies

The Duff brothers' success can be attributed to several key strategies. Firstly, they focused on diversification, with DCI investing in businesses ranging from trucking and automotive to construction and insurance. Secondly, they prioritized operational excellence and achieved top rankings in their respective industries for many of their companies.

Philanthropy

Thomas Duff is known for his philanthropic contributions to Mississippi universities. He and his brother have made substantial contributions, including $50 million in public pledges to the University of Southern Mississippi, the University of Mississippi, and Mississippi State University. They have also supported the construction of facilities at these universities, such as the Jim and Thomas Duff Athletic Center at USM and the Jim and Thomas Duff Center for Science and Technology Innovation at Ole Miss.

Career Milestones

1979

Graduated from the University of Southern Mississippi

Earned a bachelor's degree in business administration.

1983

Took over Southern Tire Mart

Together with his brother, transformed the family's tire shop into the largest truck tire dealer and retread manufacturer in the U.S.

2007

Cofounded Duff Capital Investors

Established a holding company that now manages over 20 businesses.

2024

Launched Political Action Committee (PAC)

Formed a PAC to support conservative candidates and policies in Mississippi.

Philanthropy & Social Impact

Education

University of Southern Mississippi

$30M

Pledged significant donations for scholarships and the USM Center for Military Veterans, Service Members and Families building initiative.

Education

University of Mississippi

$26M

Contributed to the construction of the Jim and Thomas Duff Center for Science and Technology Innovation.

Education

Mississippi State University

$Several Millions

Financial support for various initiatives and programs.

Controversies & Challenges

2016

Murder Plot

Three individuals were arrested in connection to a murder plot against Thomas Duff.

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