Mark W. Westphal - 12 Nov 2025 Form 4 Insider Report for Post Holdings, Inc. (POST)

Reporting relationship: PRES., FOODSERVICE
Issuer ticker: POST
Reported as of: 12 Nov 2025
Net transaction value: -$379,976
SEC form: 4
Accepted by SEC: 14 Nov 2025, 16:39:33 UTC
Prior SEC filing: 24 Oct 2025
Next SEC filing: 18 Nov 2025
Source filing: View source filing
Reporting owner signature: /s/ Diedre J. Gray, Attorney-in-Fact

Key filing fact

Mark W. Westphal filed Form 4 for Post Holdings, Inc. (POST) on 14 Nov 2025.

Key facts

This page summarizes Mark W. Westphal's Form 4 filing for Post Holdings, Inc. (POST).
6 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 14 Nov 2025, 16:39.

Change

Previous filing in this sequence was filed on 24 Oct 2025.
Current net transaction value: -$379,976.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001730096 Primary reporting owner

WESTPHAL MARK W

Relationship: PRES., FOODSERVICE
Address: C/O POST HOLDINGS, INC., 2503 S. HANLEY ROAD, ST. LOUIS
Signature: /s/ Diedre J. Gray, Attorney-in-Fact
Signature date: 14 Nov 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

POST transaction

Common Stock

Options Exercise

Transaction value: $0
Shares: +3,097
Change %: +1.7%
Price: $0.000000
Shares after: 181,934
Date: 12 Nov 2025
Ownership: Direct

POST transaction

Common Stock

Tax liability

Transaction value: $149,806
Shares: -1,413
Change %: -0.78%
Price: $106.02
Shares after: 180,521
Date: 12 Nov 2025
Ownership: Direct
Footnotes: F1

POST transaction

Common Stock

Options Exercise

Transaction value: $0
Shares: +4,759
Change %: +2.6%
Price: $0.000000
Shares after: 185,280
Date: 12 Nov 2025
Ownership: Direct

POST transaction

Common Stock

Tax liability

Transaction value: $230,169
Shares: -2,171
Change %: -1.2%
Price: $106.02
Shares after: 183,109
Date: 12 Nov 2025
Ownership: Direct
Footnotes: F2

POST holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 17,174
Date: 12 Nov 2025
Ownership: By 401(k) Plan

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

POST transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value: $0
Shares: -3,097
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 12 Nov 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 3,097
Exercise price
Footnotes: F3, F4

POST transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value: $0
Shares: -4,759
Change %: -33%
Price: $0.000000
Shares after: 9,518
Date: 12 Nov 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 4,759
Exercise price
Footnotes: F3, F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

Surrender of shares in payment of tax withholding due as a result of the vesting of 3,097 restricted stock units ("RSUs") in accordance with Rule 16b-3.

Footnote F2

Surrender of shares in payment of tax withholding due as a result of the vesting of 4,759 RSUs in accordance with Rule 16b-3.

Footnote F3

Each RSU represents a contingent right to receive one share of Post Holdings, Inc. common stock. The RSUs were granted under the Post Holdings, Inc. Amended and Restated 2021 Long-Term Incentive Plan in a transaction exempt under Rule 16b-3.

Footnote F4

The RSUs vested on the first anniversary of the date of grant without any action on the part of the participant.

Footnote F5

One-third of the RSUs vest on each of the first, second and third anniversaries of the date of grant without any action on the part of the participant, subject to the terms of the applicable award agreement.