Billionaire Profile
James Duff
Global Rank
#980

Image: Public domain | via Wikimedia Commons

James Duff

CEO, Southern Tire Mart
US
Real-Time Net Worth
$4.1B
As of December 2025
Age
64
Source
Tires, diversified
Industry
diversified
Citizenship
US

Biography

James Duff, a prominent American businessman, is co-founder and co-owner of Duff Capital Investors. His wealth stems from a diverse portfolio, with a significant foundation in the tire industry. Born in 1961, Duff inherited Southern Tire Mart from his father in 1983, transforming it into a leading tire dealership chain. His career highlights include co-founding Duff Capital Investors, a holding company with an impressive annual turnover. With a current net worth of $4.1 billion, Duff's achievements also encompass his philanthropic efforts. He currently resides in Hattiesburg, Mississippi, with his family.

Wealth Over Time

In-Depth Profile

Early Life

James Duff was born in Columbia, Mississippi, in 1961. Details about his early life and childhood are not widely available, but he was raised in Mississippi. His father, Ernest Duff, was a lawyer and businessman. James has three siblings: Thomas Duff, Stephen Duff, and Jane Duff Thomley.

Rise to Success

In 1983, James Duff inherited Southern Tire Mart from his father. Under his leadership, the company flourished and became a successful tire dealership chain. In addition to his role at Southern Tire Mart, James co-founded Duff Capital Investors, a holding company that oversees a diverse portfolio of businesses. Duff Capital Investors has an impressive annual turnover of over $2.6 billion. In 2003, the Duff brothers bought Southern Tire Mart back for $15 million, and by 2025, Southern Tire Mart's revenues had grown to exceed $4 billion, making it the nation's largest truck tire dealer and retread manufacturer.

Key Business Strategies

Key business strategies include transforming Southern Tire Mart into a thriving tire dealership chain. Also, co-founding Duff Capital Investors and overseeing its growth into a multi-billion dollar holding company.

Philanthropy

James Duff is actively involved in philanthropic activities. The Duffs made a $26 million gift to construct the Jim and Thomas Duff Center for Science and Technology Innovation at the University of Mississippi. Additionally, they have supported the Jim and Thomas Duff Athletic Center at the University of Southern Mississippi. In 2020, they pledged collective gifts of $30 million in planned gifts to The University of Southern Mississippi, representing the largest bequests in the University's history.

Career Milestones

1983

Inherited Southern Tire Mart

Took over the family tire business.

2003

Bought back Southern Tire Mart

Reacquired the company with his brother Thomas, expanding it into a leading truck tire dealer.

2007

Cofounded Duff Capital Investors

Established a holding company which expanded across multiple industries.

Philanthropy & Social Impact

Education

Jim and Thomas Duff Center for Science and Technology Innovation

$26M

A significant gift to the University of Mississippi for a new STEM facility.

Education/Athletics

University of Southern Mississippi Support

$1M+

Donations to the Jim and Thomas Duff Athletic Center and other initiatives.

Education

Planned Gifts for Scholarships

$30M

Pledges to the University of Southern Mississippi for scholarships.