Who is Diane Hendricks, Wisconsin’s richest woman?

America’s richest self-made woman lives in Wisconsin. She’s also, unsurprisingly, the richest person in the state.

So who is Diane Hendricks? Hendricks is the co-founder of Beloit-based ABC Supply Co., which sells roofing and building supplies. In June, she was named the richest self-made woman in the nation for the ninth year in a row by Forbes. She was also ranked the wealthiest Wisconsinite in 2025, with a 2026 net worth of $22.3 billion.

In 2022, Forbes dubbed Hendricks “the most successful female entrepreneur in American history.”

Raised on a dairy farm in Osseo, Wisconsin, the 79 year-old Hendricks had her first child at 17. She left school and worked as a Playboy Bunny before co-founding the ABC empire with her second husband in 1982. When he passed away in 2007, she took over the company.

Since then, Hendricks has more than tripled her net worth, acquired large competitors, and expanded into other sectors. According to Forbes, ABC Supply had 900 locations and $20.2 billion in revenue in 2025. She is also the chair and founder of Hendricks Commercial Properties, a real estate development company, and Hendricks Holding Company, Inc., a private investment firm.

A 2016 Journal Sentinel investigation found that Hendricks had paid zero state income tax for three years. Another investigation found that her 8,500 square foot mansion in the Town of Rock had been taxed as a 1,663 square foot ranch house for years.

Hendricks is also a powerful force in conservative politics in the state and nationally. She has donated millions to the GOP over the years. In 2016, she was a vice chair of the Trump Victory fundraising committee. Months before being named the richest person in Wisconsin, Hendricks spoke at the 2024 Republican National Convention in Milwaukee as an “everyday American.”

Hendricks has also championed economic development efforts in Beloit, cohosting an A&E show with her daughter titled “Betting on Beloit.”