Pauline MacMillan Keinath

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.

Wealth
As of June 2024, she has a net wealth of $8.2 billion from an inherited 9% stake in Cargill.

In 2014, she was the 16th richest woman in the US. In 2022, her wealth made her the richest person in Missouri.

Family
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.

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

Political involvement
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.

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.