Diane Hendricks Tops List of Wisconsin Billionaires

The ABC Supply co-founder remains the wealthiest Wisconsinite, with a net worth of $22.3 billion.

Published on Mar. 11, 2026

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Diane Hendricks, the chair, owner and co-founder of Beloit-based ABC Supply, remains the wealthiest Wisconsinite, topping the list of Badger State billionaires included in Forbes magazine's annual list of the world's billionaires. Hendricks, 79, has a net worth of $22.3 billion, up from $21.9 billion a year ago.

Why it matters

The Forbes billionaires list provides insight into the state's wealthiest individuals and the industries that have fostered their success. Hendricks' continued dominance on the list underscores the strength of the construction supply industry in Wisconsin, while the inclusion of other business leaders highlights the state's diverse economic landscape.

The details

ABC Supply, the company Hendricks co-founded, has over 900 branch locations and had $20.7 billion in 2024 revenues. Other Wisconsin billionaires on the Forbes list include John Menard Jr., founder of Eau Claire-based Menards home improvement stores, Judy Faulkner of Epic Systems, and members of the Johnson and Cargill families.

  • Diane Hendricks, 79, has a net worth of $22.3 billion, up from $21.9 billion a year ago.

The players

Diane Hendricks

The chair, owner and co-founder of Beloit-based ABC Supply, the wealthiest Wisconsinite with a net worth of $22.3 billion.

John Menard Jr.

The 86-year-old founder and owner of Eau Claire-based home improvement retailer Menards, with a net worth of $19.4 billion.

Judy Faulkner

The 82-year-old founder and CEO of Verona-based health care records company Epic Systems, with a net worth of $7.8 billion.

James Cargill II

A 76-year-old heir to Minnesota-based Cargill, with a net worth of $5.4 billion.

Helen Johnson-Leipold

The 69-year-old heir to Racine-based and family-owned cleaning products company SC Johnson, chairman and CEO of Racine-based Johnson Outdoors, and chairman of Johnson Financial Group, with a net worth of $4.9 billion.

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The takeaway

The continued dominance of Wisconsin billionaires in the Forbes rankings underscores the state's economic strength, with leaders in construction, retail, healthcare, and family-owned businesses driving the state's prosperity. The diversity of industries represented highlights Wisconsin's broad-based economic foundation.