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
6/50
Latest evidence
12 Nov 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
-
6 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
-
12 Nov 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
6/50
Latest evidence
12 Nov 2026
13D/G
3/4/5
13F
Lead comparable stake: 10%
44 rows are not safely comparable across share classes.
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%.
6 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
5.1%
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%
Reported 13D/G
· 04 Mar 2026
|
$539,404,522
4,885,468 shares
|
+$276,025 | 04 Mar 2026 |
| Route One Investment Company, L.P. |
13D/G
|
6.5%
Reported 13D/G
· 31 Mar 2026
|
$294,643,720
2,950,568 shares
|
-$46,270,131 | 31 Mar 2026 |
| DIMENSIONAL FUND ADVISORS LP |
13D/G
13F
Company
|
6.4%
Reported 13D/G
· 31 Mar 2026
|
$303,685,562
3,071,875 shares
|
+$25,649,425 | 31 Mar 2026 |
| JPMORGAN CHASE & CO |
13D/G
|
5.1%
Reported 13D/G
· 30 Sep 2025
|
$299,943,791
2,790,694 shares
|
$0 | 30 Sep 2025 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13D/G
13F
Vanguard Portfolio Management · Company
|
5.1%
Reported 13D/G
· 30 Sep 2026
|
$163,278,122
2,241,292 shares
|
+$2,163,864 | 30 Sep 2026 |
| Clarkston Capital Partners, LLC |
13D/G
13F
Company
|
2.6%
Reported 13D/G
· 31 Mar 2026
|
$119,139,671
1,193,067 shares
|
$0 | 31 Mar 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13F
Company
|
—
denominator unverified
|
$122,597,735
1,682,879 shares
|
— | 30 Sep 2026 |
| Robert Vitale V |
3/4/5
EXECUTIVE CHAIRMAN, Director
|
—
mixed-class rows
|
$95,315,185
1,346,887 shares
mixed-class rows
|
— | 12 Nov 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 selling over the last 12 months. Net value: -$34,723,305.
Buys
$176,274
Insiders: 1
Sells
$34,899,579
Insiders: 4
Net
-$34,723,305
Shares: -407,159
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 1,800
Shares: 408,959
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 384,132 | $0 | $32,289,106 | -$32,289,106 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 6,186 | $0 | $649,839 | -$649,839 |
| 9-12 | 1,800 | 18,641 | $176,274 | $1,960,634 | -$1,784,360 |
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
-$34.72M
Full value: -$34,723,305 · USD · 12-month changeLatest report
12 Nov 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| William P. Stiritz | Chairman Emeritus | $415,405,019 | -$32,289,106 | -7.2% | Mixed | 01 Sep 2026 |
| Robert Vitale V | EXECUTIVE CHAIRMAN, Director | $95,315,185 | Mixed | 12 Nov 2026 | ||
| Jeff A. Zadoks | Director | $20,448,272 | Mixed | 30 Oct 2026 | ||
| Diedre J. Gray | Evp, Gc & Cao, Secy | $19,622,582 | Median | 12 Nov 2026 | ||
| Mark W. Westphal | Pres., Foodservice | $17,389,208 | Median | 12 Nov 2026 | ||
| David P. Skarie | Director | $9,190,836 | Mixed | 30 Oct 2026 | ||
| Nicolas Catoggio | Pres & Ceo | $7,350,565 | -$1,002,109 | -12% | Median | 12 Nov 2026 |
| Matthew J. Mainer | Evp, Cfo & Treasurer | $6,991,939 | Mixed | 12 Nov 2026 | ||
| Howard A. Friedman | Evp & Coo | $6,458,299 | Mixed | 17 Nov 2021 | ||
| David W. Kemper | Director | $5,428,327 | +$176,274 | +3.4% | Mixed | 30 Oct 2026 |
| Robert E. Grote | Director | $4,552,793 | Mixed | 30 Jan 2025 | ||
| Thomas C. Erb | Director | $4,536,285 | Mixed | 30 Oct 2026 | ||
| Edwin H. Callison | Director | $2,450,396 | Mixed | 30 Jun 2022 | ||
| Gregory L. Curl | Director | $2,366,885 | -$1,448,060 | -38% | Mixed | 30 Oct 2026 |
| Ellen F. Harshman | Director | $2,241,943 | Mixed | 30 Jan 2025 | ||
| Dorothy M. Burwell | Director | $1,724,451 | Mixed | 30 Oct 2026 | ||
| Jennifer Kuperman Johnson | Director | $1,564,785 | Mixed | 30 Oct 2026 | ||
| Bradly A. Harper | Svp, Chief Accting Offcr Loa | $1,007,220 | -$160,304 | -14% | Mixed | 12 Nov 2026 |
| Gregory Carl Pearson | Pres & Ceo, Pcb | $831,926 | Mixed | 05 Apr 2026 | ||
| Michelle Marie Atkinson | Director | $401,394 | Mixed | 30 Oct 2026 |
Recent insider transactions for Post Holdings, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Mark W. Westphal | POST | Common Stock | Tax liability | -0.97% | -2,171 | 221,255 | 12 Nov 2026 | Direct | ||
| Mark W. Westphal | POST | Common Stock | Options Exercise | 2.18% | 4,759 | 223,426 | 12 Nov 2026 | Direct | ||
| Mark W. Westphal | POST | Restricted Stock Units | Options Exercise | -50% | -4,759 | 4,759 | 12 Nov 2026 | Direct | ||
| Robert Vitale V | POST | Common Stock | Tax liability | -0.6% | -6,424 | 1,062,031 | 12 Nov 2026 | Direct | ||
| Robert Vitale V | POST | Common Stock | Options Exercise | 1.38% | 14,582 | 1,068,455 | 12 Nov 2026 | Direct | ||
| Robert Vitale V | POST | Restricted Stock Units | Options Exercise | -50% | -14,582 | 14,583 | 12 Nov 2026 | Direct | ||
| Matthew J. Mainer | POST | Common Stock | Tax liability | -1.95% | -1,725 | 86,945 | 12 Nov 2026 | Direct | ||
| Matthew J. Mainer | POST | Common Stock | Options Exercise | 4.62% | 3,916 | 88,670 | 12 Nov 2026 | Direct | ||
| Matthew J. Mainer | POST | Restricted Stock Units | Options Exercise | -50% | -3,916 | 3,917 | 12 Nov 2026 | Direct | ||
| Bradly A. Harper | POST | Common Stock | Tax liability | -4.61% | -564 | 11,679 | 12 Nov 2026 | Direct | ||
| Bradly A. Harper | POST | Common Stock | Options Exercise | 11.7% | 1,280 | 12,243 | 12 Nov 2026 | Direct | ||
| Bradly A. Harper | POST | Restricted Stock Units | Options Exercise | -50% | -1,280 | 1,281 | 12 Nov 2026 | Direct | ||
| Diedre J. Gray | POST | Common Stock | Tax liability | -3.92% | -2,389 | 58,614 | 12 Nov 2026 | Direct | ||
| Diedre J. Gray | POST | Common Stock | Options Exercise | 9.76% | 5,423 | 61,003 | 12 Nov 2026 | Direct | ||
| Diedre J. Gray | POST | Restricted Stock Units | Options Exercise | -50% | -5,423 | 5,423 | 12 Nov 2026 | Direct | ||
| Nicolas Catoggio | POST | Common Stock | Tax liability | -2.28% | -2,353 | 100,900 | 12 Nov 2026 | Direct | ||
| Nicolas Catoggio | POST | Common Stock | Options Exercise | 5.39% | 5,282 | 103,253 | 12 Nov 2026 | Direct | ||
| Nicolas Catoggio | POST | Restricted Stock Units | Options Exercise | -50% | -5,282 | 5,282 | 12 Nov 2026 | Direct | ||
| Jeff A. Zadoks | POST | Post Holdings, Inc. Stock Equivalents | Award | 16.2% | 134 | 955 | 30 Oct 2026 | Direct | ||
| David P. Skarie | POST | Post Holdings, Inc. Stock Equivalents | Award | 0.47% | 160 | 34,169 | 30 Oct 2026 | Direct | ||
| Jennifer Kuperman Johnson | POST | Post Holdings, Inc. Stock Equivalents | Award | 1.78% | 134 | 7,645 | 30 Oct 2026 | Direct | ||
| David W. Kemper | POST | Post Holdings, Inc. Stock Equivalents | Award | 0.96% | 207 | 21,767 | 30 Oct 2026 | Direct | ||
| Thomas C. Erb | POST | Post Holdings, Inc. Stock Equivalents | Award | 1.78% | 134 | 7,645 | 30 Oct 2026 | Direct | ||
| Gregory L. Curl | POST | Post Holdings, Inc. Stock Equivalents | Award | 1.63% | 134 | 8,344 | 30 Oct 2026 | Direct | ||
| Dorothy M. Burwell | POST | Post Holdings, Inc. Stock Equivalents | Award | 1.48% | 134 | 9,156 | 30 Oct 2026 | Direct | ||
| Michelle Marie Atkinson | POST | Post Holdings, Inc. Stock Equivalents | Award | 16.2% | 134 | 955 | 30 Oct 2026 | Direct | ||
| Jeff A. Zadoks | POST | Common Stock | Tax liability | -42.2% | -17,933 | 24,577 | 22 Oct 2026 | Direct | ||
| Jeff A. Zadoks | POST | Common Stock | Award | 2261.7% | 40,710 | 42,510 | 22 Oct 2026 | Direct | ||
| Mark W. Westphal | POST | Common Stock | Tax liability | -7.42% | -17,530 | 218,667 | 22 Oct 2026 | Direct | ||
| Mark W. Westphal | POST | Common Stock | Award | 19.4% | 38,441 | 236,197 | 22 Oct 2026 | Direct | ||
| Robert Vitale V | POST | Common Stock | Tax liability | -4.74% | -52,384 | 1,053,873 | 22 Oct 2026 | Direct | ||
| Robert Vitale V | POST | Common Stock | Award | 12% | 118,919 | 1,106,257 | 22 Oct 2026 | Direct | ||
| Matthew J. Mainer | POST | Common Stock | Tax liability | -8.57% | -7,940 | 84,754 | 22 Oct 2026 | Direct | ||
| Matthew J. Mainer | POST | Common Stock | Award | 24.1% | 18,024 | 92,694 | 22 Oct 2026 | Direct | ||
| Diedre J. Gray | POST | Common Stock | Tax liability | -25.1% | -18,655 | 55,580 | 22 Oct 2026 | Direct | ||
| Diedre J. Gray | POST | Common Stock | Award | 132.8% | 42,349 | 74,235 | 22 Oct 2026 | Direct | ||
| Nicolas Catoggio | POST | Common Stock | Tax liability | -15.9% | -18,533 | 97,971 | 22 Oct 2026 | Direct | ||
| Nicolas Catoggio | POST | Common Stock | Award | 54.2% | 40,962 | 116,504 | 22 Oct 2026 | Direct | ||
| Jeff A. Zadoks | POST | Post Holdings, Inc. Stock Equivalents | Award | 22.8% | 153 | 822 | 30 Sep 2026 | Direct | ||
| David P. Skarie | POST | Post Holdings, Inc. Stock Equivalents | Award | 0.54% | 183 | 34,028 | 30 Sep 2026 | Direct | ||
| Jennifer Kuperman Johnson | POST | Post Holdings, Inc. Stock Equivalents | Award | 2.07% | 153 | 7,515 | 30 Sep 2026 | Direct | ||
| David W. Kemper | POST | Post Holdings, Inc. Stock Equivalents | Award | 1.11% | 236 | 21,572 | 30 Sep 2026 | Direct | ||
| Thomas C. Erb | POST | Post Holdings, Inc. Stock Equivalents | Award | 2.07% | 153 | 7,515 | 30 Sep 2026 | Direct | ||
| Gregory L. Curl | POST | Post Holdings, Inc. Stock Equivalents | Award | 1.89% | 153 | 8,216 | 30 Sep 2026 | Direct | ||
| Dorothy M. Burwell | POST | Post Holdings, Inc. Stock Equivalents | Award | 1.72% | 153 | 9,028 | 30 Sep 2026 | Direct | ||
| Michelle Marie Atkinson | POST | Post Holdings, Inc. Stock Equivalents | Award | 22.8% | 153 | 822 | 30 Sep 2026 | Direct | ||
| William P. Stiritz | POST | Common Stock | Sale | -100% | -$23,410,643 | $84.23 | -277,935 | 0 | 02 Sep 2026 | By Spouse |
| William P. Stiritz | POST | Common Stock | Sale | -27.6% | -$8,878,463 | $83.60 | -106,197 | 277,935 | 01 Sep 2026 | By Spouse |
| Jeff A. Zadoks | POST | Post Holdings, Inc. Stock Equivalents | Award | 24.8% | 133 | 670 | 31 Aug 2026 | Direct | ||
| David P. Skarie | POST | Post Holdings, Inc. Stock Equivalents | Award | 0.48% | 160 | 33,832 | 31 Aug 2026 | Direct |
* marks a reported price that did not pass the local price check.