BRADLY A. HARPER - 14 Nov 2025 Form 4 Insider Report for Post Holdings, Inc. (POST)

Role: SVP, CHIEF ACCTING OFFICER
Signature: /s/ Diedre J. Gray, Attorney-in-Fact
Issuer symbol: POST
Transactions as of: 14 Nov 2025
Transactions value $: -$131,400
Form type: 4
Filing time: 18 Nov 2025, 17:08:47 UTC
Previous filing: 14 Nov 2025
Next filing: 20 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
HARPER BRADLY A	SVP, CHIEF ACCTING OFFICER	C/O POST HOLDINGS, INC., 2503 S. HANLEY ROAD, ST. LOUIS	/s/ Diedre J. Gray, Attorney-in-Fact	18 Nov 2025	0001759632

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	POST	Common Stock	Tax liability	-$79K	-743	-7.86%	$106.34	8.71K	14 Nov 2025	Direct	F1
transaction	POST	Common Stock	Tax liability	-$31.9K	-299	-3.43%	$106.70	8.42K	15 Nov 2025	Direct	F2
transaction	POST	Common Stock	Options Exercise	$0	+435	+5.17%	$0.00	8.85K	16 Nov 2025	Direct
transaction	POST	Common Stock	Tax liability	-$20.5K	-192	-2.17%	$106.70	8.66K	16 Nov 2025	Direct	F3
holding	POST	Common Stock						1.44K	14 Nov 2025	By 401(k) Plan

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	POST	Restricted Stock Units	Options Exercise	$0	-435	-100%	$0.00	0	16 Nov 2025	Common Stock	435		Direct	F4, F5

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Surrender of shares in payment of tax withholding due as a result of the vesting of 1,685 restricted stock units ("RSUs") in accordance with Rule 16b-3.
F2	Surrender of shares in payment of tax withholding due as a result of the vesting of 677 RSUs in accordance with Rule 16b-3.
F3	Surrender of shares in payment of tax withholding due as a result of the vesting of 435 RSUs in accordance with Rule 16b-3.
F4	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. 2021 Long-Term Incentive Plan, which was subsequently amended and restated, in a transaction exempt under Rule 16b-3.
F5	One-fourth of the RSUs vested on each of the first, second, third and fourth anniversaries on the date of grant without any action on the part of the participant.