🕵️ POST Holdings, Inc. ($POST)
SEC insider & ownership activity, last 12 months · CIK 1530950 · every row links its SEC filing
Over the last 12 months insiders sold $34.9M against $176K of open-market buying. William P. Stiritz sold $32.3M (Sep). William P. Stiritz added 9.3% → 10.3%; Dimensional Fund Advisors LP added 5.2% → 6.4%. No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
1 buyer, $176K (1 lots) · 4 sellers, $34.9M (8 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| William P. Stiritz | 0 | – | 4 | $32.3M | Sep 2, 2026 |
| Gregory L. Curl | 0 | – | 2 | $1.4M | May 13, 2026 |
| Catoggio Nicolas | 0 | – | 1 | $1.0M | Nov 25, 2025 |
| David W. Kemper | 1 | $176K | 0 | – | Nov 24, 2025 |
| Bradly A. Harper | 0 | – | 1 | $160K | Dec 5, 2025 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| William P. Stiritz | 10.3% | 13D | Mar 4, 2026 | filing ↗ | |
| Route One Investment Company, L.P. | 6.5% | 13G | May 14, 2026 | filing ↗ | |
| ROIC, LLC | 6.5% | 13G | May 14, 2026 | filing ↗ | |
| Route One Investment Company, LLC | 6.5% | 13G | May 14, 2026 | filing ↗ | |
| William F. Duhamel, JR. | 6.5% | 13G | May 14, 2026 | filing ↗ | |
| Jason E. Moment | 6.5% | 13G | May 14, 2026 | filing ↗ | |
| Dimensional Fund Advisors LP | 6.4% | 13G | Apr 9, 2026 | filing ↗ | |
| JPMorgan Chase & Co. | 5.1% | 13G | Oct 31, 2025 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| William P. Stiritz | $32.8M | Aug 31, 2026 | filing ↗ |
| Gregory L. Curl | $650K | May 13, 2026 | filing ↗ |
| Gregory L. Curl | $798K | Feb 9, 2026 | filing ↗ |
| Sandra Zadoks | $5.7M | Feb 9, 2026 | filing ↗ |
| Bradly A. Harper | $160K | Dec 5, 2025 | filing ↗ |
| Catoggio Nicolas | $1.0M | Nov 25, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Earnings (2.02) | Aug 6, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 6, 2026 | filing ↗ |
| Officer/director changes (5.02) | May 5, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 5, 2026 | filing ↗ |
| Earnings (2.02) | May 5, 2026 | filing ↗ |
| Officer/director changes (5.02) | May 5, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 5, 2026 | filing ↗ |
| Other events (8.01) | May 5, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 5, 2026 | filing ↗ |
| New financial obligation (2.03) | Mar 13, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 13, 2026 | filing ↗ |
| Other events (8.01) | Mar 4, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 4, 2026 | filing ↗ |
| Other events (8.01) | Mar 4, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 4, 2026 | filing ↗ |
| Officer/director changes (5.02) | Feb 5, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Feb 5, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 5, 2026 | filing ↗ |
| Earnings (2.02) | Feb 3, 2026 | filing ↗ |
| Officer/director changes (5.02) | Feb 3, 2026 | filing ↗ |
| Other events (8.01) | Feb 3, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 3, 2026 | filing ↗ |
| Material Modifications to Rights of Security Holders (3.03) | Jan 29, 2026 | filing ↗ |
| Charter/bylaw changes (5.03) | Jan 29, 2026 | filing ↗ |
| Shareholder vote (5.07) | Jan 29, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 29, 2026 | filing ↗ |
| New financial obligation (2.03) | Dec 15, 2025 | filing ↗ |
| Other events (8.01) | Dec 15, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 15, 2025 | filing ↗ |
| Other events (8.01) | Dec 2, 2025 | filing ↗ |