William P. Stiritz

CIK: 0001052058

Transaction Breakdown

Open Market Buys (P)2 (7.1%)

High conviction signal

Open Market Sales (S)4 (14.3%)

Position reduction

Option Exercises (M)2 (7.1%)

Derivative conversions

Awards (A)18 (64.3%)

Compensation grants

Other (G, F, J, C, D, …)2 (7.1%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

POST

Post Holdings, Inc.

Discretionary Trading P&L

Holdings

Transaction History (28 total)

POST
Post Holdings, Inc.
Sep 2, 2026
Sale(S)
Indirect
228 shares at avg. $85.01$19K
POST
Post Holdings, Inc.
Sep 2, 2026
Sale(S)
Indirect
277.7K shares at avg. $84.23$23.4M
POST
Post Holdings, Inc.
Sep 1, 2026
Sale(S)
Indirect
6.2K shares at avg. $84.63$525K
POST
Post Holdings, Inc.
Sep 1, 2026
Sale(S)
Indirect
100K shares at avg. $83.54$8.4M
POST
Post Holdings, Inc.
Dec 18, 2025
Exercise(M)
Direct
170K shares-
POST
Post Holdings, Inc.
Dec 18, 2025
Disposition(D)
Direct
170K shares at avg. $101.81$17.3M
POST
Post Holdings, Inc.
Dec 17, 2025
Exercise(M)
Direct
10.7K shares-
POST
Post Holdings, Inc.
Dec 17, 2025
Disposition(D)
Direct
10.7K shares at avg. $101.19$1.1M
POST
Post Holdings, Inc.
Dec 16, 2025
Award(A)
Post Holdings, Inc. Stock Equivalents
Direct
58 shares at avg. $98.93-
POST
Post Holdings, Inc.
Nov 28, 2025
Award(A)
Post Holdings, Inc. Stock Equivalents
Direct
107 shares at avg. $104.03-
POST
Post Holdings, Inc.
Oct 31, 2025
Award(A)
Post Holdings, Inc. Stock Equivalents
Direct
107 shares at avg. $103.93-
POST
Post Holdings, Inc.
Sep 30, 2025
Award(A)
Post Holdings, Inc. Stock Equivalents
Direct
103 shares at avg. $107.48-
POST
Post Holdings, Inc.
Aug 29, 2025
Award(A)
Post Holdings, Inc. Stock Equivalents
Direct
98 shares at avg. $113.15-
POST
Post Holdings, Inc.
Aug 19, 2025
Purchase(P)
Direct
36K shares at avg. $109.53$3.9M
POST
Post Holdings, Inc.
Jul 31, 2025
Award(A)
Post Holdings, Inc. Stock Equivalents
Direct
105 shares at avg. $105.81-
POST
Post Holdings, Inc.
Jun 30, 2025
Award(A)
Post Holdings, Inc. Stock Equivalents
Direct
102 shares at avg. $109.03-
POST
Post Holdings, Inc.
Jun 5, 2025
Purchase(P)
Direct
186.7K shares at avg. $109.11$20.4M
POST
Post Holdings, Inc.
May 30, 2025
Award(A)
Post Holdings, Inc. Stock Equivalents
Direct
100 shares at avg. $110.59-
POST
Post Holdings, Inc.
Apr 30, 2025
Award(A)
Post Holdings, Inc. Stock Equivalents
Direct
98 shares at avg. $113.17-
POST
Post Holdings, Inc.
Mar 31, 2025
Award(A)
Post Holdings, Inc. Stock Equivalents
Direct
95 shares at avg. $116.36-
POST
Post Holdings, Inc.
Feb 28, 2025
Award(A)
Post Holdings, Inc. Stock Equivalents
Direct
98 shares at avg. $113.51-
POST
Post Holdings, Inc.
Feb 4, 2025
Award(A)
Direct
2.5K shares-
POST
Post Holdings, Inc.
Jan 31, 2025
Award(A)
Post Holdings, Inc. Stock Equivalents
Direct
105 shares at avg. $106.16-
POST
Post Holdings, Inc.
Dec 31, 2024
Award(A)
Post Holdings, Inc. Stock Equivalents
Direct
97 shares at avg. $114.46-
POST
Post Holdings, Inc.
Nov 29, 2024
Award(A)
Post Holdings, Inc. Stock Equivalents
Direct
92 shares at avg. $120.48-

		Type	Shares	Price		Ownership
Sep 2, 2026	POST Post Holdings, Inc.	Sale(S)	228	$85.01	$19,382	Indirect
Sep 2, 2026	POST Post Holdings, Inc.	Sale(S)	277,707	$84.23	$23,391,261	Indirect
Sep 1, 2026	POST Post Holdings, Inc.	Sale(S)	6,207	$84.63	$525,298	Indirect
Sep 1, 2026	POST Post Holdings, Inc.	Sale(S)	99,990	$83.54	$8,353,165	Indirect
Dec 18, 2025	POST Post Holdings, Inc.	Exercise(M)	170,001	-	-	Direct
Dec 18, 2025	POST Post Holdings, Inc.	Disposition(D)	170,001	$101.81	$17,307,781	Direct
Dec 17, 2025	POST Post Holdings, Inc.	Exercise(M)	10,703	-	-	Direct
Dec 17, 2025	POST Post Holdings, Inc.	Disposition(D)	10,703	$101.19	$1,083,059	Direct
Dec 16, 2025	POST Post Holdings, Inc.	Award(A) Post Holdings, Inc. Stock Equivalents	58	$98.93	-	Direct
Nov 28, 2025	POST Post Holdings, Inc.	Award(A) Post Holdings, Inc. Stock Equivalents	107	$104.03	-	Direct
Oct 31, 2025	POST Post Holdings, Inc.	Award(A) Post Holdings, Inc. Stock Equivalents	107	$103.93	-	Direct
Sep 30, 2025	POST Post Holdings, Inc.	Award(A) Post Holdings, Inc. Stock Equivalents	103	$107.48	-	Direct
Aug 29, 2025	POST Post Holdings, Inc.	Award(A) Post Holdings, Inc. Stock Equivalents	98	$113.15	-	Direct
Aug 19, 2025	POST Post Holdings, Inc.	Purchase(P)	36,000	$109.53	$3,943,080	Direct
Jul 31, 2025	POST Post Holdings, Inc.	Award(A) Post Holdings, Inc. Stock Equivalents	105	$105.81	-	Direct
Jun 30, 2025	POST Post Holdings, Inc.	Award(A) Post Holdings, Inc. Stock Equivalents	102	$109.03	-	Direct
Jun 5, 2025	POST Post Holdings, Inc.	Purchase(P)	186,740	$109.11	$20,376,135	Direct
May 30, 2025	POST Post Holdings, Inc.	Award(A) Post Holdings, Inc. Stock Equivalents	100	$110.59	-	Direct
Apr 30, 2025	POST Post Holdings, Inc.	Award(A) Post Holdings, Inc. Stock Equivalents	98	$113.17	-	Direct
Mar 31, 2025	POST Post Holdings, Inc.	Award(A) Post Holdings, Inc. Stock Equivalents	95	$116.36	-	Direct
Feb 28, 2025	POST Post Holdings, Inc.	Award(A) Post Holdings, Inc. Stock Equivalents	98	$113.51	-	Direct
Feb 4, 2025	POST Post Holdings, Inc.	Award(A)	2,500	-	-	Direct
Jan 31, 2025	POST Post Holdings, Inc.	Award(A) Post Holdings, Inc. Stock Equivalents	105	$106.16	-	Direct
Dec 31, 2024	POST Post Holdings, Inc.	Award(A) Post Holdings, Inc. Stock Equivalents	97	$114.46	-	Direct
Nov 29, 2024	POST Post Holdings, Inc.	Award(A) Post Holdings, Inc. Stock Equivalents	92	$120.48	-	Direct

1-25 of 28 transactions

About STIRITZ WILLIAM P

STIRITZ WILLIAM P (SEC CIK 0001052058) files insider reports with the SEC as Post Holdings, Inc. (POST).

Signal8 holds 22 ownership filings by STIRITZ WILLIAM P, all Form 4s, filed between Sep 4, 2024 and Sep 3, 2026. Those filings report 28 transactions, from Aug 30, 2024 to Sep 2, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on STIRITZ WILLIAM P's filings is in ST. LOUIS, MO.

Recent filings by STIRITZ WILLIAM P

Sep 2, 2026: Open-market sales of POST shares (2 lines, Form 4, code S).
Sep 1, 2026: Open-market sales of POST shares (2 lines, Form 4, code S).
Dec 18, 2025: Option exercise of POST shares (Form 4, code M).
Dec 18, 2025: Disposition to issuer transaction of POST shares (Form 4, code D).
Dec 17, 2025: Option exercise of POST shares (Form 4, code M).