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

Rhea-AI Filing Summary

Post Holdings (POST) EVP, CFO & Treasurer reported routine equity activity on 11/12/2025. Two restricted stock unit (RSU) tranches vested and were converted to common stock: 6,008 and 3,916 shares at an exercise price of $0. To cover tax withholding, the filer surrendered 2,647 and 1,725 shares at $106.02 per share.

Following these transactions, the filer directly beneficially owned 52,264 shares of common stock. RSU holdings reported as beneficially owned after the transactions totaled 7,833 units.

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

OMB APPROVAL

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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^*

MAINER MATTHEW J

(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)
	EVP, CFO & TREASURER

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		6,008	A	$0	52,720	D
Common Stock	11/12/2025		F		2,647(1)	D	$106.02	50,073	D
Common Stock	11/12/2025		M		3,916	A	$0	53,989	D
Common Stock	11/12/2025		F		1,725(2)	D	$106.02	52,264	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			6,008	(4)	(4)	Common Stock	6,008	$0	0	D
Restricted Stock Units	(3)	11/12/2025		M			3,916	(5)	(5)	Common Stock	3,916	$0	7,833	D

Explanation of Responses:

1. Surrender of shares in payment of tax withholding due as a result of the vesting of 6,008 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 3,916 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 CFO report on Form 4?

Two RSU vestings converting into 6,008 and 3,916 common shares, with share surrenders for tax withholding.

When did the POST transactions occur?

All reported transactions occurred on 11/12/2025.

How many shares were surrendered for taxes and at what price?

The filer surrendered 2,647 and 1,725 shares at $106.02 per share for tax withholding.

How many POST shares does the filer own after the transactions?

Direct beneficial ownership is 52,264 common shares after the reported transactions.

How many RSUs remain after these transactions?

Reported derivative holdings include 7,833 RSUs beneficially owned after the transactions.

What roles does the reporting person hold at POST?

The reporting person is EVP, CFO & Treasurer of Post Holdings, Inc.

Under which plan were the RSUs granted?

Under the Post Holdings, Inc. Amended and Restated 2021 Long‑Term Incentive Plan.