Nicolas Catoggio - 12 Nov 2025 Form 4 Insider Report for Post Holdings, Inc. (POST)

Role: PRES & CEO, PCB
Signature: /s/ Diedre J. Gray, Attorney-in-Fact
Issuer symbol: POST
Transactions as of: 12 Nov 2025
Net transactions value: -$416,235
Form type: 4
Filing time: 14 Nov 2025, 16:35:00 UTC
Previous filing: 24 Oct 2025
Next filing: 18 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
CATOGGIO NICOLAS	PRES & CEO, PCB	C/O POST HOLDINGS, INC., 2503 S. HANLEY ROAD, ST. LOUIS	/s/ Diedre J. Gray, Attorney-in-Fact	14 Nov 2025	0001882375

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	POST	Common Stock	Options Exercise	$0	+3,326	+5.6%	$0.000000	62,916	12 Nov 2025	Direct
transaction	POST	Common Stock	Tax liability	$160,832	-1,517	-2.4%	$106.02	61,399	12 Nov 2025	Direct	F1
transaction	POST	Common Stock	Options Exercise	$0	+5,281	+8.6%	$0.000000	66,680	12 Nov 2025	Direct
transaction	POST	Common Stock	Tax liability	$255,402	-2,409	-3.6%	$106.02	64,271	12 Nov 2025	Direct	F2

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	-3,326	-100%	$0.000000	0	12 Nov 2025	Common Stock	3,326		Direct	F3, F4
transaction	POST	Restricted Stock Units	Options Exercise	$0	-5,281	-33%	$0.000000	10,564	12 Nov 2025	Common Stock	5,281		Direct	F3, 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 3,326 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 5,281 RSUs in accordance with Rule 16b-3.
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.
F4	The RSUs vested on the first anniversary of the date of grant without any action on the part of the participant.
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.