Post Holdings POST Insider Ownership

NYSE POST

$82.22 -0.83 (-1.00%)

At close: Nov 9, 2026 · 4:00 PM EST

Insider Holdings by Owner

6.09Mn Shares

William P Stiritz4.33Mn71.2%

Robert V Vitale1.05Mn17.3%

Mark W Westphal218.67K3.6%

Nicolas Catoggio97.97K1.6%

Matthew J Mainer84.75K1.4%

Other insiders (14)299.62K4.9%

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

14.48%

▼-0.767% pp QoQ

Shares Held by Insiders

6.53Mn

filed for Sep 2026

▼-5.03% QoQ

Shares Outstanding

45.10Mn

45,100,000 shares

Direct Holdings

5.91Mn

Indirect: 626.47K

Net Open-Market Trades

-384.13K

net sold · -$32.29Mn in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Open-Market Insider Trades

Bought Sold

Latest quarter —

Net over range —

Net-buying quarters —

Insider Ownership Summary

Updated Nov 5, 2026

Across the past 12 months, open-market trades by Post Holdings insiders totaled $176,274 in purchases (1.8K shares) and $34.9 million in sales (408.96K shares).

Counted by insider, open-market buying of POST stock in the past 12 months came from one insider and selling from 4 insiders.
Among Post Holdings' insiders, the largest open-market purchases in the past 12 months were by David W. Kemper (Director), totaling $176,274 (1.8K shares), most recently on November 24, 2025.
Meanwhile, the largest open-market sales of POST in the past 12 months were by William P. Stiritz, totaling $32.29 million (384.13K shares), most recently on September 2, 2026.
Away from the open market, POST insiders received 481.96K shares in stock awards, acquired 284.47K shares through option exercises and conversions, gave up 228.34K shares to cover taxes or exercise prices and gave away 310.74K shares as gifts over the last 12 months.
Business Quant data puts insider holdings in POST at 6.65Mn shares across insiders' latest Form 4 filings, or 14.75% of the 45.1Mn shares outstanding; that total is down 3.31% from 6.88Mn shares at the end of Q2 2026 and up 1.60% from 6.55Mn shares at the end of Q3 2025.
Of the 6.65Mn shares held by Post Holdings insiders, 6.07Mn shares (91.30%) are held directly and 578.33K shares (8.70%) indirectly, through trusts, partnerships, family members and other entities.
Business Quant counts 18 insiders with holdings in Post Holdings stock, among the officers, directors and 10% owners who have filed a Form 4 in the past two years.
Post Holdings' three largest insider shareholders, based on their latest Form 4 filings, are William P. Stiritz (4.5Mn shares), Robert V. Vitale (Executive Chairman, 1.05Mn shares) and Diedre J. Gray (EVP, GC & CAO, Secretary, 266.32K shares).
William P. Stiritz alone accounts for 67.72% of the shares held by Post Holdings insiders.
A total of 143 Form 4 filings with transactions in Post Holdings stock were made over the past 12 months, by 16 insiders.
These insider figures for Post Holdings are based on Form 4 filings through November 3, 2026.

Form 4 Holdings

Insiders Holding POST

Insiders 19

Shares held 6.09Mn

Of outstanding 13.50%

#	Insider	Position	Direct	Total	Share of Insiders	Last Filed
1	William P Stiritz	Chairman And Ceo	4,334,667	4,334,667	71.2%	19 Dec, 2025
2	Robert V Vitale	Executive Chairman	1,053,873	1,053,873	17.3%	26 Oct, 2026
3	Mark W Westphal	Pres., Foodservice	218,667	218,667	3.6%	26 Oct, 2026
4	Nicolas Catoggio	Pres Ceo	97,971	97,971	1.6%	26 Oct, 2026
5	Matthew J Mainer	Evp, Cfo Treasurer	84,754	84,754	1.4%	26 Oct, 2026
6	David P Skarie	Director	56,991	56,991	0.9%	05 Feb, 2026
7	Diedre J Gray	Evp, Gc Cao, Secy	55,580	55,580	0.9%	26 Oct, 2026
8	Thomas C Erb	Director	38,675	38,675	0.6%	05 Feb, 2026
9	David W Kemper	Director	33,122	33,122	0.5%	05 Feb, 2026
10	Jeff A Zadoks	Evp Coo	24,577	24,577	0.4%	26 Oct, 2026
11	Edwin H Callison	Director	17,045	17,045	0.3%	04 Apr, 2022
12	Gregory L Curl	Director	15,107	15,107	0.2%	14 May, 2026
13	Bradly A Harper	Svp, Chief Accting Officer	10,963	10,963	0.2%	12 Jan, 2026
14	Ellen F Harshman	Director	10,372	10,372	0.2%	05 Sep, 2024
15	Robert E Grote	Director	9,665	9,665	0.2%	20 Nov, 2024
16	Jennifer Kuperman Johnson	Director	8,675	8,675	0.1%	05 Feb, 2026
17	Dorothy M Burwell	Director	8,665	8,665	0.1%	05 Feb, 2026
18	Gregory Carl Pearson	Pres Ceo, Pcb	8,485	8,485	0.1%	06 Apr, 2026
19	Michelle Marie Atkinson	Director	1,700	1,700	0.0%	18 Mar, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

2,492 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
30 Oct, 2026	Jennifer Kuperman Johnson	Director	Acquired A	134	$83.22	$11.11K	7,645	Direct
30 Oct, 2026	Jeff A Zadoks	Director	Acquired A	134	$83.22	$11.11K	955	Direct
30 Oct, 2026	Thomas C Erb	Director	Acquired A	134	$83.22	$11.11K	7,645	Direct
30 Oct, 2026	David W Kemper	Director	Acquired A	207	$83.22	$17.22K	21,767	Direct
30 Oct, 2026	Michelle Marie Atkinson	Director	Acquired A	134	$83.22	$11.11K	955	Direct
30 Oct, 2026	Gregory L Curl	Director	Acquired A	134	$83.22	$11.11K	8,344	Direct
30 Oct, 2026	Dorothy M Burwell	Director	Acquired A	134	$83.22	$11.11K	9,156	Direct
30 Oct, 2026	David P Skarie	Director	Acquired A	160	$83.22	$13.33K	34,169	Direct
22 Oct, 2026	Diedre J Gray	Evp, Gc Cao, Secy	Acquired A	42,349	$0.00	$0	74,235	Direct
22 Oct, 2026	Nicolas Catoggio	Pres Ceo	Acquired A	40,962	$0.00	$0	116,504	Direct
22 Oct, 2026	Robert V Vitale	Executive Chairman	Acquired A	118,919	$0.00	$0	1,106,257	Direct
22 Oct, 2026	Mark W Westphal	Pres., Foodservice	Acquired A	38,441	$0.00	$0	236,197	Direct
22 Oct, 2026	Jeff A Zadoks	Director	Acquired A	40,710	$0.00	$0	42,510	Direct
22 Oct, 2026	Matthew J Mainer	Evp, Cfo Treasurer	Acquired A	18,024	$0.00	$0	92,694	Direct
22 Oct, 2026	Mark W Westphal	Pres., Foodservice	Disposed F	17,530	$78.06	$1.37Mn	218,667	Direct
22 Oct, 2026	Diedre J Gray	Evp, Gc Cao, Secy	Disposed F	18,655	$78.06	$1.46Mn	55,580	Direct
22 Oct, 2026	Jeff A Zadoks	Director	Disposed F	17,933	$78.06	$1.40Mn	24,577	Direct
22 Oct, 2026	Nicolas Catoggio	Pres Ceo	Disposed F	18,533	$78.06	$1.45Mn	97,971	Direct
22 Oct, 2026	Robert V Vitale	Executive Chairman	Disposed F	52,384	$78.06	$4.09Mn	1,053,873	Direct
22 Oct, 2026	Matthew J Mainer	Evp, Cfo Treasurer	Disposed F	7,940	$78.06	$619.80K	84,754	Direct

Showing 1 to 20 of 2,492 transactions