Founder Profile
William P. Stiritz
Last reviewed: October 2026 · By Swet Parvadiya
Who is William P. Stiritz?
William P. Stiritz is a founder of Post Holdings, Inc., which was founded in 2012.
- Company founded
- Post Holdings, Inc.
- Founded
- 2012
Background
Before Post, William P. Stiritz led Ralston Purina as CEO for nearly two decades and later chaired Ralcorp Holdings, Energizer and Agribrands, spin-offs that came out of Ralston.
Founding Story
William P. Stiritz is the founding Chairman and CEO of the modern Post Holdings. When Ralcorp spun off its Post cereal business in February 2012, Stiritz took charge of the new company and began the acquisition strategy that later added Michael Foods and MOM Brands. He handed the CEO role to Robert Vitale on November 1, 2014. (Exact birth year remains publicly undisclosed).
Sources
This profile does not yet cite a source specific to William P. Stiritz. The sources below document the company company rather than the person, so check them against the claims above.
- Post Holdings FY2025 Form 10-K (Post Holdings, Inc.)
- Post Holdings Reports Results for the Third Quarter of Fiscal Year 2026 (Post Holdings, Inc.)