WILLIAM P. STIRITZ - 17 Dec 2025 Form 4 Insider Report for Post Holdings, Inc. (POST)

Role: Chairman Emeritus
Signature: /s/ Diedre J. Gray, Attorney-in-Fact
Issuer symbol: POST
Transactions as of: 17 Dec 2025
Transactions value $: -$18,390,840
Form type: 4
Filing time: 19 Dec 2025, 19:19:39 UTC
Previous filing: 18 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
STIRITZ WILLIAM P	Chairman Emeritus	C/O POST HOLDINGS, INC., 2503 S. HANLEY ROAD, ST. LOUIS	/s/ Diedre J. Gray, Attorney-in-Fact	19 Dec 2025	0001052058

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	POST	Common Stock	Options Exercise		+10.7K	+0.25%		4.35M	17 Dec 2025	Direct	F1
transaction	POST	Common Stock	Disposed to Issuer	-$1.08M	-10.7K	-0.25%	$101.19	4.33M	17 Dec 2025	Direct	F1
transaction	POST	Common Stock	Options Exercise		+170K	+3.92%		4.5M	18 Dec 2025	Direct	F1
transaction	POST	Common Stock	Disposed to Issuer	-$17.3M	-170K	-3.77%	$101.81	4.33M	18 Dec 2025	Direct	F1
holding	POST	Common Stock						169K	17 Dec 2025	By Trust
holding	POST	Common Stock						384K	17 Dec 2025	By Spouse

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	Post Holdings, Inc. Stock Equivalents	Options Exercise		-10.7K	-5.92%		170K	17 Dec 2025	Common Stock	10.7K		Direct	F1
transaction	POST	Post Holdings, Inc. Stock Equivalents	Options Exercise		-170K	-100%		0	18 Dec 2025	Common Stock	170K		Direct	F1

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

Explanation of Responses:

Id	Content
F1	Upon Reporting Person's retirement from the Board of Directors of Post Holdings, Inc. ("Post") on December 16, 2025, the Reporting Person's earned retainers as a Director of Post that were deferred into Post stock equivalents under Post's Deferred Compensation Plan for Non-Management Directors (the "Plan") were converted into cash as soon as administratively practicable following his retirement pursuant to the terms of the Plan. Each stock equivalent was the economic equivalent of one share of Post common stock. The cash will be distributed to the Reporting Person in accordance with the applicable elections previously made by the Reporting Person, including lump sum payout at his retirement, in five annual installments following his retirement and in ten annual installments following his retirement.

Content

Upon Reporting Person's retirement from the Board of Directors of Post Holdings, Inc. ("Post") on December 16, 2025, the Reporting Person's earned retainers as a Director of Post that were deferred into Post stock equivalents under Post's Deferred Compensation Plan for Non-Management Directors (the "Plan") were converted into cash as soon as administratively practicable following his retirement pursuant to the terms of the Plan. Each stock equivalent was the economic equivalent of one share of Post common stock. The cash will be distributed to the Reporting Person in accordance with the applicable elections previously made by the Reporting Person, including lump sum payout at his retirement, in five annual installments following his retirement and in ten annual installments following his retirement.