Post Holdings Inc
Ownership
Ownership Structure
Who owns Post Holdings Inc (POST)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 78.3% of the shares are freely tradable; institutional investors hold 104.6%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 8.95 | 3,933,480 | -1.2 | 06/30/2026 |
| Dimensional Fund Advisors, Inc. | 7.18 | 3,156,637 | +2.8 | 06/30/2026 |
| Route One Investment Co, LP | 6.71 | 2,950,568 | +0.0 | 06/30/2026 |
| JPMorgan Chase & Co | 5.59 | 2,455,999 | -8.0 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 4.95 | 2,175,658 | -10.5 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.06 | 1,784,517 | -4.8 | 06/30/2026 |
| London Company of Virginia | 3.18 | 1,399,101 | -5.3 | 06/30/2026 |
| State Street Corp | 3.07 | 1,348,671 | -5.2 | 06/30/2026 |
| NORGES BANK | 2.98 | 1,309,435 | +14.1 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 3.02 | 1,329,645 | +0.0 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Vitale Robert V | EXECUTIVE CHAIRMAN | 1,053,873 | 87,682,234 $ | Oct 22, 2026 | direct |
| Zadoks Jeff A | Director | 221,677 | 18,443,526 $ | Aug 25, 2026 | both |
| Westphal Mark W | PRES., FOODSERVICE | 218,667 | 18,193,094 $ | Oct 22, 2026 | direct |
| Catoggio Nicolas | PRES & CEO | 97,971 | 8,151,187 $ | Oct 22, 2026 | direct |
| Mainer Matthew J | EVP, CFO & TREASURER | 84,754 | 7,051,533 $ | Oct 22, 2026 | direct |
| Gray Diedre J | EVP, GC & CAO, SECY | 55,580 | 4,624,256 $ | Oct 22, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 22, 2026 | Mainer Matthew J | EVP, CFO & TREASURER | Other | 7,940 | 78.06 | 619,796 |
| Oct 22, 2026 | Mainer Matthew J | EVP, CFO & TREASURER | Other | 18,024 | 0.00 | – |
| Oct 22, 2026 | Catoggio Nicolas | PRES & CEO | Other | 18,533 | 78.06 | 1,446,686 |
| Oct 22, 2026 | Catoggio Nicolas | PRES & CEO | Other | 40,962 | 0.00 | – |
| Oct 22, 2026 | Westphal Mark W | PRES., FOODSERVICE | Other | 17,530 | 78.06 | 1,368,392 |
| Oct 22, 2026 | Westphal Mark W | PRES., FOODSERVICE | Other | 38,441 | 0.00 | – |
| Oct 22, 2026 | Gray Diedre J | EVP, GC & CAO, SECY | Other | 18,655 | 78.06 | 1,456,209 |
| Oct 22, 2026 | Gray Diedre J | EVP, GC & CAO, SECY | Other | 42,349 | 0.00 | – |
| Oct 22, 2026 | Vitale Robert V | EXECUTIVE CHAIRMAN | Other | 52,384 | 78.06 | 4,089,095 |
| Oct 22, 2026 | Vitale Robert V | EXECUTIVE CHAIRMAN | Other | 118,919 | 0.00 | – |
| Oct 22, 2026 | Zadoks Jeff A | Director | Other | 17,933 | 78.06 | 1,399,850 |
| Oct 22, 2026 | Zadoks Jeff A | Director | Other | 40,710 | 0.00 | – |
| Sep 2, 2026 | Stiritz William P | Chairman Emeritus | Sell | 228 | 85.01 | 19,382 |
| Sep 2, 2026 | Stiritz William P | Chairman Emeritus | Sell | 277,707 | 84.23 | 23,391,261 |
| Sep 1, 2026 | Stiritz William P | Chairman Emeritus | Sell | 6,207 | 84.63 | 525,298 |
| Sep 1, 2026 | Stiritz William P | Chairman Emeritus | Sell | 99,990 | 83.54 | 8,353,165 |
| Aug 25, 2026 | Zadoks Jeff A | Director | Other | 122,740 | 0.00 | – |
| Aug 25, 2026 | Zadoks Jeff A | Director | Other | 26,215 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: October 30, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.