As of November 6, 2026, 5 holders' latest Schedule 13D or 13G filings report owning 5% or more of Post Holdings Inc. The largest reported stake is William P. Stiritz's, at 10.3%. 14 filings are on record since July 15, 2025 (Schedule 13D/A, March 5, 2026).
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Key facts
- · Reporting person: Vanguard Portfolio Management · Sole voting: 35,719 · Shared voting: 0 · Sole dispositive: 2,241,292 · Shared dispositive: 0 · SCHEDULE 13G, 2026-10-30
- · Holder: Vanguard Portfolio Management · Percent: 4.87% · SCHEDULE 13G/A
- · Reporting person: Route One Investment Company, L.P. · Sole voting: 0 · Shared voting: 2,950,568 · Sole dispositive: 0 · Shared dispositive: 2,950,568 · SCHEDULE 13G/A, 2026-05-14
- · Reporting person: Clarkston Capital Partners, LLC · Sole voting: 664,000 · Shared voting: 358,367 · Sole dispositive: 664,000 · Shared dispositive: 529,067 · SCHEDULE 13G/A, 2026-05-14
- · Holder: Vanguard Portfolio Management · Percent: 5.12% · SCHEDULE 13G
Post Holdings Inc has 14 Schedule 13D or 13G filings on record since 2025-07-15. 5 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 10.3% | 4,885,468 | SCHEDULE 13D/A, 2026-03-05 | 2026-03-04 | |
| Route One Investment Company, L.P. | 6.5% | 2,950,568 | SCHEDULE 13G/A, 2026-05-14 | 2026-03-31 |
| Dimensional Fund Advisors LP | 6.4% | 3,071,875 | SCHEDULE 13G/A, 2026-04-09 | 2026-03-31 |
| Jpmorgan Chase & Co. | 5.1% | 2,790,694 | SCHEDULE 13G, 2025-10-31 | 2025-09-30 |
| Vanguard Portfolio Management | 5.09% | 2,241,292 | SCHEDULE 13G, 2026-10-30 | 2026-09-30 |
| Clarkston Capital Partners, LLC | 2.63% | 1,193,067 | SCHEDULE 13G/A, 2026-05-14 | 2026-03-31 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
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More on Post Holdings Inc and the records around it.
Post Holdings Inc elsewhere on the record
- Leadership changes Aug 2026
- Who owns it
Companies that share a holder
- Route One Investment Company, L.P. also filed stake reports on 1 other company: Herbalife Ltd. (Oct 2025)
- Clarkston Capital Partners, LLC also filed stake reports on 8 other companies: CLARIVATE PLC (May 2026), ENERGIZER HOLDINGS, INC. (May 2026), JOHN WILEY & SONS, INC. (May 2026)
- JPMORGAN CHASE & CO. also filed stake reports on 116 other companies: LEVI STRAUSS & CO (Nov 2026), Warner Music Group Corp. (Nov 2026), Andersen Group Inc. (Oct 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Route One Investment Company, L.P. | 0 | 2,950,568 | 0 | 2,950,568 | SCHEDULE 13G/A, 2026-05-14 |
| Roic, LLC | 0 | 2,950,568 | 0 | 2,950,568 | SCHEDULE 13G/A, 2026-05-14 |
| Route One Investment Company, LLC | 0 | 2,950,568 | 0 | 2,950,568 | SCHEDULE 13G/A, 2026-05-14 |
| William F. Duhamel, Jr. | 0 | 2,950,568 | 0 | 2,950,568 | SCHEDULE 13G/A, 2026-05-14 |
| Jason E. Moment | 0 | 2,950,568 | 0 | 2,950,568 | SCHEDULE 13G/A, 2026-05-14 |
| Vanguard Portfolio Management | 35,719 | 0 | 2,241,292 | 0 | SCHEDULE 13G, 2026-10-30 |
| Clarkston Capital Partners, LLC | 664,000 | 358,367 | 664,000 | 529,067 | SCHEDULE 13G/A, 2026-05-14 |
| Clarkston Companies, Inc. | 664,000 | 358,367 | 664,000 | 529,067 | SCHEDULE 13G/A, 2026-05-14 |
| Jeffrey A. Hakala | 664,000 | 358,367 | 664,000 | 529,067 | SCHEDULE 13G/A, 2026-05-14 |
| Gerald W. Hakala | 664,000 | 358,367 | 664,000 | 529,067 | SCHEDULE 13G/A, 2026-05-14 |
The latest filing identifies Post Holdings Inc by CUSIP 737446104 and gives its principal executive office as 2503 South Hanley Road, Saint Louis, MO 63144 (SCHEDULE 13G, 2026-10-30).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-15 | Dimensional Fund Advisors LP | 4.8% | SCHEDULE 13G/A |
| 2025-08-13 | Route One Investment Company, L.P. | 6.1% | SCHEDULE 13G/A |
| 2025-09-08 | The Vanguard Group | 10.3% | SCHEDULE 13G/A |
| 2025-10-09 | Dimensional Fund Advisors LP | 5.2% | SCHEDULE 13G |
| 2025-10-15 | William P. Stiritz | 9.3% | SCHEDULE 13D/A |
| 2025-10-31 | Jpmorgan Chase & Co. | 5.1% | SCHEDULE 13G |
| 2026-03-05 | William P. Stiritz | 10.3% | SCHEDULE 13D/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-09 | Dimensional Fund Advisors LP | 6.4% | SCHEDULE 13G/A |
| 2026-04-29 | Vanguard Portfolio Management | 5.12% | SCHEDULE 13G |
| 2026-05-14 | Clarkston Capital Partners, LLC | 2.63% | SCHEDULE 13G/A |
| 2026-05-14 | Route One Investment Company, L.P. | 6.5% | SCHEDULE 13G/A |
| 2026-07-31 | Vanguard Portfolio Management | 4.87% | SCHEDULE 13G/A |
| 2026-10-30 | Vanguard Portfolio Management | 5.09% | SCHEDULE 13G |
Questions about who owns Post Holdings Inc
Who owns Post Holdings Inc?
On this page, 5 holders' latest ownership filings report 5% or more of Post Holdings Inc: William P. Stiritz (10.3%, Schedule 13D/A, filed 2026-03-05), Route One Investment Company, L.P. (6.5%, Schedule 13G/A, filed 2026-05-14), Dimensional Fund Advisors LP (6.4%, Schedule 13G/A, filed 2026-04-09), Jpmorgan Chase & Co. (5.1%, Schedule 13G, filed 2025-10-31) and Vanguard Portfolio Management (5.09%, Schedule 13G, filed 2026-10-30).
Who are the largest shareholders of Post Holdings Inc?
By the share each holder's latest filing reports, the largest holders of Post Holdings Inc on this page are William P. Stiritz (10.3%), Route One Investment Company, L.P. (6.5%) and Dimensional Fund Advisors LP (6.4%).
When did William P. Stiritz buy into Post Holdings Inc?
The filings give report dates, not purchase dates. The earliest filing from William P. Stiritz on this page is the Schedule 13D/A, filed 2025-10-15, reporting 9.3%; its latest, Schedule 13D/A filed 2026-03-05, reports 10.3%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 14 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for Post Holdings Inc
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| October 16, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| May 7, 2026 | Leadership change: Nicolas Catoggio appointed, President and Chief Executive Officer | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.