Mark W. Westphal

CIK: 0001730096

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)3 (14.3%)

Derivative conversions

Awards (A)7 (33.3%)

Compensation grants

Other (G, F, J, C, D, …)11 (52.4%)

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

Companies & Roles (1)

POST

Post Holdings, Inc.

Officer

Discretionary Trading P&L

Holdings

Transaction History (21 total)

POST
Post Holdings, Inc.
Oct 22, 2026
Award(A)
Direct
38.4K shares-
POST
Post Holdings, Inc.
Oct 22, 2026
Tax Payment(F)
Direct
17.5K shares at avg. $78.06$1.4M
POST
Post Holdings, Inc.
Nov 18, 2025
Award(A)
Direct
16.7K shares-
POST
Post Holdings, Inc.
Nov 18, 2025
Award(A)
Direct
3.2K shares-
POST
Post Holdings, Inc.
Nov 15, 2025
Tax Payment(F)
Direct
2.5K shares at avg. $106.70$269K
POST
Post Holdings, Inc.
Nov 14, 2025
Tax Payment(F)
Direct
2.8K shares at avg. $106.34$293K
POST
Post Holdings, Inc.
Nov 12, 2025
Exercise(M)
Direct
3.1K shares-
POST
Post Holdings, Inc.
Nov 12, 2025
Tax Payment(F)
Direct
1.4K shares at avg. $106.02$150K
POST
Post Holdings, Inc.
Nov 12, 2025
Exercise(M)
Direct
4.8K shares-
POST
Post Holdings, Inc.
Nov 12, 2025
Tax Payment(F)
Direct
2.2K shares at avg. $106.02$230K
POST
Post Holdings, Inc.
Oct 22, 2025
Award(A)
Direct
43.1K shares-
POST
Post Holdings, Inc.
Oct 22, 2025
Tax Payment(F)
Direct
19.7K shares at avg. $107.19$2.1M
POST
Post Holdings, Inc.
Nov 16, 2024
Exercise(M)
Direct
6K shares-
POST
Post Holdings, Inc.
Nov 16, 2024
Tax Payment(F)
Direct
2.7K shares at avg. $106.14$292K
POST
Post Holdings, Inc.
Nov 15, 2024
Tax Payment(F)
Direct
2.5K shares at avg. $107.78$272K
POST
Post Holdings, Inc.
Nov 14, 2024
Tax Payment(F)
Direct
4.9K shares at avg. $109.47$541K
POST
Post Holdings, Inc.
Nov 14, 2024
Tax Payment(F)
Direct
2.8K shares at avg. $109.47$302K
POST
Post Holdings, Inc.
Nov 13, 2024
Award(A)
Restricted Stock Units
Direct
3.1K shares-
POST
Post Holdings, Inc.
Nov 13, 2024
Award(A)
Restricted Stock Units
Direct
14.3K shares-
POST
Post Holdings, Inc.
Oct 21, 2024
Award(A)
Direct
47K shares-
POST
Post Holdings, Inc.
Oct 21, 2024
Tax Payment(F)
Direct
21.4K shares at avg. $115.21$2.5M

		Type	Shares	Price		Ownership
Oct 22, 2026	POST Post Holdings, Inc.	Award(A)	38,441	-	$0	Direct
Oct 22, 2026	POST Post Holdings, Inc.	Tax Payment(F)	17,530	$78.06	$1,368,392	Direct
Nov 18, 2025	POST Post Holdings, Inc.	Award(A)	16,682	-	-	Direct
Nov 18, 2025	POST Post Holdings, Inc.	Award(A)	3,243	-	-	Direct
Nov 15, 2025	POST Post Holdings, Inc.	Tax Payment(F)	2,521	$106.70	$268,991	Direct
Nov 14, 2025	POST Post Holdings, Inc.	Tax Payment(F)	2,757	$106.34	$293,179	Direct
Nov 12, 2025	POST Post Holdings, Inc.	Exercise(M)	3,097	-	-	Direct
Nov 12, 2025	POST Post Holdings, Inc.	Tax Payment(F)	1,413	$106.02	$149,806	Direct
Nov 12, 2025	POST Post Holdings, Inc.	Exercise(M)	4,759	-	-	Direct
Nov 12, 2025	POST Post Holdings, Inc.	Tax Payment(F)	2,171	$106.02	$230,169	Direct
Oct 22, 2025	POST Post Holdings, Inc.	Award(A)	43,108	-	-	Direct
Oct 22, 2025	POST Post Holdings, Inc.	Tax Payment(F)	19,658	$107.19	$2,107,141	Direct
Nov 16, 2024	POST Post Holdings, Inc.	Exercise(M)	6,027	-	$0	Direct
Nov 16, 2024	POST Post Holdings, Inc.	Tax Payment(F)	2,749	$106.14	$291,779	Direct
Nov 15, 2024	POST Post Holdings, Inc.	Tax Payment(F)	2,521	$107.78	$271,713	Direct
Nov 14, 2024	POST Post Holdings, Inc.	Tax Payment(F)	4,941	$109.47	$540,891	Direct
Nov 14, 2024	POST Post Holdings, Inc.	Tax Payment(F)	2,757	$109.47	$301,809	Direct
Nov 13, 2024	POST Post Holdings, Inc.	Award(A) Restricted Stock Units	3,097	-	-	Direct
Nov 13, 2024	POST Post Holdings, Inc.	Award(A) Restricted Stock Units	14,277	-	-	Direct
Oct 21, 2024	POST Post Holdings, Inc.	Award(A)	47,008	-	$0	Direct
Oct 21, 2024	POST Post Holdings, Inc.	Tax Payment(F)	21,436	$115.21	$2,469,642	Direct

1-21 of 21 transactions

About WESTPHAL MARK W

WESTPHAL MARK W (SEC CIK 0001730096) files insider reports with the SEC as PRES., FOODSERVICE of Post Holdings, Inc. (POST).

Signal8 holds 9 ownership filings by WESTPHAL MARK W, all Form 4s, filed between Oct 23, 2024 and Oct 26, 2026. Those filings report 21 transactions, from Oct 21, 2024 to Oct 22, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on WESTPHAL MARK W's filings is in ST. LOUIS, MO.

Recent filings by WESTPHAL MARK W

Oct 22, 2026: Grant or award of POST shares (Form 4, code A).
Oct 22, 2026: Tax withholding of POST shares (Form 4, code F).
Nov 18, 2025: Grants or awards of POST shares (2 lines, Form 4, code A).
Nov 15, 2025: Tax withholding of POST shares (Form 4, code F).
Nov 14, 2025: Tax withholding of POST shares (Form 4, code F).