Early Life and Education
Marianne Liebmann was born in 1953 and is a great-granddaughter of William Wallace Cargill, who founded Cargill in 1865 as a grain storage business. She graduated from Montana State University with a bachelor's degree.
Career and Business Involvement
While specific details about Marianne Liebmann's career are limited, it is known that she has held various positions within the Cargill corporation. Her contributions to the family business have helped maintain its success and growth. She is one of the twelve billionaire heirs to Cargill, America's largest private company, and one of seven relatives who hold a combined 88% of Cargill, the largest private company in the U.S.. In 2025, the company reported $154 billion in total revenue.
Personal Life
Marianne Liebmann resides in Bozeman, Montana, where she lives with her husband and has two children. Her son, Andrew C. Liebmann, has served on Cargill's board of directors. She is known for leading a relatively private life, away from the public eye.
Wealth and Philanthropy
As of September 2025, Forbes estimates her net worth at $4.8 billion, placing her at #319 on the annual Forbes 400 list of America's richest individuals. The Cargill-MacMillan family collectively owns about 88% of the company, and Liebmann's wealth derives primarily from annual dividends tied to its performance.