Hendricks (left) in 2017
Diane Marie Smith|
1947 (age 70–71)
Wisconsin, United States
|Residence||Afton, Wisconsin, United States|
|Occupation||Co-founder and chairperson, ABC Supply|
|Net worth||$4.3 billion (January 2017)|
|Spouse(s)||Ken Hendricks (deceased)|
Hendricks was born and raised in Wisconsin, the daughter of dairy farmers. She graduated from Osseo-Fairchild High School in 1965, and had been divorced from her first husband for ten years when she met Ken Hendricks.
In 1975, she was selling custom-built homes and Ken was a roofing contractor. They married and became business partners. In 1982, they used their lines of credit to secure a loan that enabled them to establish ABC Supply. ABC Supply is privately held, and sells roofing, windows, gutters, and siding for residential and commercial buildings.
Diane Hendricks owns the Hendricks Holding Company, and is the owner and chairperson of ABC Supply. In March 2012, Forbes estimated her net worth at US$2.8 billion; Forbes estimated it at $4.3 billion as of January 2017.  
She is a donor to WisconsinEye, and co-chair of Rock County 5.0, a five-year public/private initiative to advance Rock County’s economic development vision. She has served on the boards of the Stateline Boys & Girls Club, Beloit Memorial Hospital, the Beloit Foundation, Forward Janesville, Kandu Industries, Blackhawk Bank, and the Hendricks Family Foundation. Hendricks serves on the Board of Trustees of Beloit College.
She donated $500,000 to Governor Scott Walker's 2012 campaign to avoid recall, and was his biggest donor that year. She also supports Paul Ryan. In 2014, she donated $1 million to the Freedom Partners Action Fund, a pro-Republican Super PAC created by the Koch Brothers. In both 2015 and 2016, she donated $2 million to Freedom Partners Action Fund. In 2015, she gave $5 million to a PAC associated with presidential candidate Scott Walker, but has had $4 million refunded.
In the 2016 U.S. presidential election, she gave over $5 million to the Reform America Fund, a super PAC which has opposed Hillary Clinton and supported Republican U.S. Senator from Wisconsin Ron Johnson. Hendricks served as an economic advisor to Donald Trump's presidential campaign.
Hendricks paid no state income tax in four of the five years from 2010 to 2014.
An investigation by Urban Milwaukee found that Hendricks's multi-story 8,500-square-foot home in the Town of Rock in Rock County, Wisconsin had been assessed as a 1,663-square-foot ranch. Following the Urban Milwaukee investigation, Hendricks denied the tax assessor access to the property, citing "security reasons". After she agreed to supply the assessor with data on the home, the property's assessment was changed from $445,700 to $1,205,500.
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- Cary Spivak. "Beloit billionaire posts string of zeros on state returns". Milwaukee Journal Sentinel, June 9, 2016. Retrieved December 18, 2017.
- Horne, Michael (May 17, 2017). "Hendricks Not Paying Property Taxes?". Urban Milwaukee. Retrieved December 18, 2017.
- Murphy, Bruce (June 1, 2017). "Hendricks' Home Is Reassessed". Urban Milwaukee. Retrieved December 18, 2017.
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