Elaine Marshall inherited her family's interest in Koch through her late husband, E. Pierce Marshall; Forbes estimates that she and her sons together own about 16% of the private company. [1][2]
An inherited Koch interest
Forbes says Marshall inherited the family stake after the 2006 death of her husband, E. Pierce Marshall. His father, J. Howard Marshall II, had been an early business partner of Koch founder Fred Koch, linking the Marshall family's wealth to the company across generations. [1]
Forbes currently estimates that Elaine Marshall and her two sons together own about 16% of Koch. The Koch materials used here describe the company and its history but do not allocate that private ownership among the Marshall family, so the percentage remains an external estimate. [1][2]
The company behind the inheritance
Koch describes itself as one of the world's largest privately held companies and says it grew from a small family business into a diversified group spanning industries and technologies. In 2024, the organization adopted Koch, Inc. as its top-level holding-company name as part of a broader corporate restructuring. [2][3]
Sources for background
Sources reviewed Sep 8, 2026.
- Elaine Marshall & family · Forbes · Mar 10, 2026
- About Us · Koch
- Koch's Continual Transformation · Koch · Jun 6, 2024
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