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. 76.0% of the shares are freely tradable; institutional investors hold 104.6%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 9.05 | 3,979,802 | -5.3 | 03/31/2026 |
| 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 | 6.07 | 2,668,814 | -10.3 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 5.53 | 2,431,497 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.26 | 1,874,037 | +0.0 | 03/31/2026 |
| Holocene Advisors, LP | 4.02 | 1,766,642 | +52.6 | 03/31/2026 |
| London Company of Virginia | 3.36 | 1,476,638 | -6.9 | 03/31/2026 |
| State Street Corp | 3.24 | 1,422,219 | -4.0 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Core S&P Mid-Cap ETF | 3.18 | 1,396,742 | +0.0 | 08/31/2026 |
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 |
|---|---|---|---|---|---|
| Zadoks Jeff A | Director | 197,100 | 15,354,090 $ | Aug 25, 2026 | indirect |
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 |
|---|---|---|---|---|---|---|
| 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: September 17, 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.