Comparable stake leader
William P. Stiritz
SEC ownership of Post Holdings, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001530950.
Disclosed value leader
William P. Stiritz
Comparable rows
50/50
Latest evidence
30 Jun 2026
- Public ticker
- POST on NYSE
- Parsed ownership sources
-
13D/G, 3/4/5, and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
William P. Stiritz
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
50 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
William P. Stiritz
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
30 Jun 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001530950
- Issuer location
- St. Louis, MO
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Post Holdings, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
William P. Stiritz
Disclosed value leader
William P. Stiritz
Comparable rows
50/50
Latest evidence
30 Jun 2026
13D/G
3/4/5
13F
Lead comparable stake: 10%
13D/G row: William P. Stiritz
Showing 1-8 of 50 holder rows.
Quick read
William P. Stiritz leads the comparable SEC ownership view at 10%.
50 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens William P. Stiritz's linked filing trail.
Comparable ownership
Top 5
William P. Stiritz
10%
Route One Investment Company, L.P.
6.5%
DIMENSIONAL FUND ADVISORS LP
6.4%
JPMORGAN CHASE & CO
5.1%
VANGUARD PORTFOLIO MANAGEMENT LLC
4.9%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| William P. Stiritz |
13D/G
3/4/5
Chairman Emeritus
|
10%
|
$539,404,522
4,885,468 shares
|
+$276,025 | 04 Mar 2026 |
| Route One Investment Company, L.P. |
13D/G
13F
Company
|
6.5%
|
$294,643,720
2,950,568 shares
|
-$46,270,131 | 31 Mar 2026 |
| DIMENSIONAL FUND ADVISORS LP |
13D/G
13F
Company
|
6.4%
|
$303,685,562
3,071,875 shares
|
+$25,649,425 | 31 Mar 2026 |
| JPMORGAN CHASE & CO |
13D/G
13F
Company
|
5.1%
|
$299,943,791
2,790,694 shares
|
$0 | 30 Sep 2025 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
13D/G
Company · Vanguard Portfolio Management
|
4.9%
from 13D/G
|
$192,023,575
2,175,658 shares
|
— | 30 Jun 2026 |
| Clarkston Capital Partners, LLC |
13D/G
13F
Company
|
2.6%
|
$119,139,671
1,193,067 shares
|
$0 | 31 Mar 2026 |
| Bradly A. Harper |
3/4/5
SVP, CHIEF ACCTING OFFICER
|
0.03%
|
$1,269,509
12,406 shares
mixed-class rows
|
-$160,304 | 09 Jan 2026 |
| Gregory Carl Pearson |
3/4/5
PRES & CEO, PCB
|
0.02%
|
$831,926
8,485 shares
|
— | 05 Apr 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$1,508,881.
Buys
$4,119,354
Insiders: 2
Sells
$2,610,473
Insiders: 3
Net
+$1,508,881
Shares: +12,973
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 37,800
Shares: 24,827
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 6,186 | $0 | $649,839 | -$649,839 |
| 6-9 | 1,800 | 18,641 | $176,274 | $1,960,634 | -$1,784,360 |
| 9-12 | 36,000 | 0 | $3,943,080 | $0 | +$3,943,080 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 20 reporting-owner rows connected to Post Holdings, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
20
Largest Forms 3/4/5 holder
William P. Stiritz
Net 12M change
+$1,508,881
Latest report
31 Jul 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| William P. Stiritz | Chairman Emeritus | $518,249,806 | +$3,943,080 | +0.77% | Mixed | 17 Dec 2025 |
| Robert Vitale V | PRESIDENT & CEO, Director | $127,939,978 | Mixed | 18 Nov 2025 | ||
| Diedre J. Gray | Evp, Gc & Cao, Secy | $25,888,406 | Mixed | 26 Dec 2025 | ||
| Mark W. Westphal | Pres., Foodservice | $22,400,004 | Mixed | 18 Nov 2025 | ||
| Jeff A. Zadoks | Director | $17,614,840 | Median | 31 Jul 2026 | ||
| David P. Skarie | Director | $9,190,836 | Mixed | 31 Jul 2026 | ||
| Matthew J. Mainer | Evp, Cfo & Treasurer | $8,598,403 | Mixed | 04 Dec 2025 | ||
| Nicolas Catoggio | Pres & Ceo, Pcb | $7,570,131 | -$1,002,109 | -12% | Filing P/S | 25 Nov 2025 |
| Howard A. Friedman | Evp & Coo | $6,458,299 | Mixed | 17 Nov 2021 | ||
| David W. Kemper | Director | $5,428,327 | +$176,274 | +3.4% | Mixed | 31 Jul 2026 |
| Robert E. Grote | Director | $4,552,793 | Mixed | 30 Jan 2025 | ||
| Thomas C. Erb | Director | $4,536,285 | Mixed | 31 Jul 2026 | ||
| Edwin H. Callison | Director | $2,450,396 | Mixed | 30 Jun 2022 | ||
| Gregory L. Curl | Director | $2,366,885 | -$1,448,060 | -38% | Mixed | 31 Jul 2026 |
| Ellen F. Harshman | Director | $2,241,943 | Mixed | 30 Jan 2025 | ||
| Dorothy M. Burwell | Director | $1,724,451 | Mixed | 31 Jul 2026 | ||
| Jennifer Kuperman Johnson | Director | $1,564,785 | Mixed | 31 Jul 2026 | ||
| Bradly A. Harper | Svp, Chief Accting Officer | $1,269,509 | -$160,304 | -11% | Mixed | 09 Jan 2026 |
| Gregory Carl Pearson | Pres & Ceo, Pcb | $831,926 | Mixed | 05 Apr 2026 | ||
| Michelle Marie Atkinson | Director | $401,394 | Mixed | 31 Jul 2026 |
Recent insider transactions for Post Holdings, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
* marks a reported price that did not pass the local price check.