William Stiritz
William Stiritz is number 186 in the 311 Private Wealth Index, with disclosed holdings in listed companies worth about $684m, mainly in Post Holdings, Inc. That is about 3,550 times the wealth of a typical US household. William Stiritz is a director of Post Holdings, Inc.
Part of the 311 Private Wealth Index (311institute.com). Last updated .
Disclosed holdings
| Company | Value | Latest filing | Shares |
|---|---|---|---|
| Post Holdings, Inc. | $684m | 3 September 2026 | 8,839,335 at $77.39 (closing price, 15 October 2026) |
How this figure is calculated
Shares reported in SEC insider filings (Forms 3, 4 and 5), at the latest holding each filing reports, valued at the latest price disclosed in those filings, or at the latest closing price where no recent trade price was filed. Holdings that the filings say belong to investment funds managed by the person are left out, and shares reported jointly by several family members are counted once. Private companies, cash, property and holdings listed outside the United States are not included, so this is a minimum, not total wealth. The household comparison uses $192,700, the median US household wealth in the Federal Reserve Survey of Consumer Finances (2022, the latest published).
Related
- Post Holdings, Inc. in the 311 Titans Index
- Innovation profile of St. Louis
- United States: economy and key statistics
- The 311 Private Wealth Index
- The 311 Titans Index
- All 311 Indexes
Questions and answers
What is William Stiritz's net worth?
William Stiritz has disclosed holdings in listed companies worth about $684m, according to the 311 Private Wealth Index. This is a minimum: private companies, cash and property are not included.
How much are William Stiritz's disclosed holdings worth?
About $684m in listed companies, ranking William Stiritz number 186 in the 311 Private Wealth Index.
Where does William Stiritz's wealth come from?
Mainly from holdings in Post Holdings, Inc. William Stiritz is a director of Post Holdings, Inc.
Source: SEC insider filings.
© 311 Institute 2026. Facts from official filings and the sources linked on this page. The selection, classification and links are the proprietary work of the 311 Institute, protected by copyright and database rights.