[Form 4] Post Holdings, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Post Holdings (POST) reported insider activity by its Pres & CEO, PCB, reflecting RSU vesting and tax withholdings on 11/12/2025. The officer acquired 3,326 shares upon RSU vesting and surrendered 1,517 shares for taxes at $106.02 per share. A second RSU vesting added 5,281 shares, followed by a tax withholding surrender of 2,409 shares at $106.02. Following these transactions, the officer directly owned 64,271 common shares. The RSUs were granted under the Amended and Restated 2021 Long-Term Incentive Plan and are exempt under Rule 16b-3; one award vested after one year, and another vests one-third annually over three years.

Insights

Equity compensation analyst

Routine Form 4: RSU vesting with tax share surrenders.

The filing shows standard equity compensation events: RSUs converted into common shares and a portion of shares withheld (surrendered) to cover taxes at $106.02. Two RSU tranches vested—3,326 shares (one-year vest) and 5,281 shares (three-year, one-third annually).

The transactions were reported under Rule 16b-3, indicating exempt, plan-based awards under the 2021 LTIP. No sale-for-cash occurred; tax obligations were satisfied via share surrender, leaving 64,271 shares directly owned after the reported activity.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

CATOGGIO NICOLAS

(Last) (First) (Middle)

C/O POST HOLDINGS, INC.

2503 S. HANLEY ROAD

(Street)

ST. LOUIS MO 63144

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Post Holdings, Inc. [ POST ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	PRES & CEO, PCB

3. Date of Earliest Transaction (Month/Day/Year)
11/12/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	11/12/2025		M		3,326	A	$0	62,916	D
Common Stock	11/12/2025		F		1,517(1)	D	$106.02	61,399	D
Common Stock	11/12/2025		M		5,281	A	$0	66,680	D
Common Stock	11/12/2025		F		2,409(2)	D	$106.02	64,271	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(3)	11/12/2025		M			3,326	(4)	(4)	Common Stock	3,326	$0	0	D
Restricted Stock Units	(3)	11/12/2025		M			5,281	(5)	(5)	Common Stock	5,281	$0	10,564	D

Explanation of Responses:

1. 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.

2. 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.

3. 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.

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

5. 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.

Remarks:

	/s/ Diedre J. Gray, Attorney-in-Fact	11/14/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did POST’s CEO report on the Form 4 dated 11/12/2025?

Vesting of 3,326 and 5,281 RSUs, plus share surrenders for taxes of 1,517 and 2,409 shares at $106.02.

How many POST shares does the reporting person own after the transactions?

The officer directly owns 64,271 shares following the reported transactions.

Were any open-market sales reported in this Form 4 for POST?

No. Shares were surrendered to cover tax withholding in connection with RSU vesting under Rule 16b-3.

What plan governs the RSUs reported by POST’s CEO?

The awards were granted under the Post Holdings, Inc. Amended and Restated 2021 Long-Term Incentive Plan.

What are the vesting terms for the reported RSUs at POST?

One award vested on the first anniversary of grant; another vests one-third on each of the first three anniversaries.

What price was used for tax share surrenders in the POST Form 4?

Tax withholdings were satisfied via share surrenders priced at $106.02 per share.