Pauline MacMillan Keinath

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Pauline MacMillan Keinath
Pauline MacMillan

(1934-07-31) July 31, 1934 (age 88)
Hennepin County, Minnesota, US
Known for9% stake in Cargill
RelativesWilliam Wallace Cargill (great-grandfather)
Cargill MacMillan Jr. (brother)
Whitney MacMillan (brother)

Pauline MacMillan Keinath (born July 31, 1934 in Hennepin County, Minnesota) is an American billionaire heiress. She is believed to be the largest individual shareholder in Cargill.[1]


As of July 2020, she has a net wealth of $5.8 billion from an inherited 9% stake in Cargill.[2]

In 2014, she was the 16th richest woman in the US.[2][3] In 2022, her wealth made her the richest person in Missouri.[4]


She is a great-granddaughter of William Wallace Cargill, the founder of Cargill, the largest private company in the US. Her father was Cargill MacMillan Sr. (1900-1968). She has two siblings, Whitney MacMillan (1929-2020) and Cargill MacMillan.[5]

She is married, with four children, and lives in St. Louis, Missouri.[2]

Political involvement[edit]

Keinath continued support of Josh Hawley after his role in the January 6 United States Capitol attack, with donations of $1,900 reported in the second half of 2021.[6]

In 2023, the family of Pauline MacMillan Keinath are the largest donors to Andrew Bailey's run for Missouri Attorney General, having contributed $375,000 to the Life and Liberty PAC.[7]

External links[edit]


  1. ^ Barr, Diana (October 6, 2021). "Six Missouri billionaires make Forbes' new list of nation's '400 richest' people". St. Louis Business Journal.
  2. ^ a b c "Forbes profile: Pauline MacMillan Keinath". Forbes. Retrieved 28 September 2020.
  3. ^ "Richest Woman In The United States of America: Top 20 Female Billionaires 2014". Ceoworld. Retrieved 13 November 2014.
  4. ^ "Richest billionaires in Missouri". 2 June 2022. Retrieved 2022-11-02.
  5. ^ Solomon, Brian. "The Secretive Cargill Billionaires And Their Family Tree". Forbes. Retrieved 2022-11-02.
  6. ^ Tindera, Michela. "These Billionaires Kept Funding Legislators Who Refused To Certify The Election After Jan. 6". Forbes. Retrieved 2023-04-18.
  7. ^ Hancock, Jason (April 18, 2023). "GOP rivals in Missouri attorney general race draw even in fundraising". Missouri Independent. Retrieved 2023-04-18.