POST director buys 36,000 shares at $109.53 — Form 4 disclosure

William P. Stiritz, a director of Post Holdings, Inc. (POST), reported an open-market purchase of 36,000 shares of common stock on 08/19/2025 at a price of $109.53 per share.

Rhea-AI Filing Summary

William P. Stiritz, a director of Post Holdings, Inc. (POST), reported an open-market purchase of 36,000 shares of common stock on 08/19/2025 at a price of $109.53 per share. After the transaction he beneficially owns 4,334,667 shares directly, with additional indirect holdings of 169,369 (by trust) and 384,132 (by spouse). The Form 4 was signed by an attorney-in-fact on 08/21/2025.

Insights

Financial Analyst

TL;DR Insider director acquired 36,000 POST shares, modest relative to existing stake; signals limited incremental insider confidence.

The purchase of 36,000 shares at $109.53 increases the reporting person's direct stake to 4,334,667 shares. Relative to his total reported holdings, the transaction is small, suggesting it is not a material change to ownership but is a routine insider buy that may be interpreted as incremental confidence in the company. No derivative transactions were reported.

Corporate Governance Expert

TL;DR Director-level open-market buy disclosed promptly; filing appears complete and properly executed by attorney-in-fact.

The Form 4 discloses the director relationship, transaction date (08/19/2025), price ($109.53) and post-transaction holdings. The signature by an attorney-in-fact on 08/21/2025 is included. There are no amendments or derivative positions reported. From a governance disclosure perspective, the filing meets required content and timeliness as presented.

Insider Trade Summary

Net Buyer: 36,000 shares

Net Buy 3 txns

Insider STIRITZ WILLIAM P

Role Director

Bought 36,000 shs ($3.94M)

Type	Security	Shares	Price	Value
Purchase	Common Stock	36,000	$109.53	$3.94M
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 4,334,667 shares (Direct); Common Stock — 169,369 shares (Indirect, By Trust); Common Stock — 384,132 shares (Indirect, By Spouse)

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did POST director William P. Stiritz purchase on 08/19/2025?

He purchased 36,000 shares of Post Holdings common stock at $109.53 per share on 08/19/2025.

How many POST shares does William P. Stiritz beneficially own after the transaction?

After the reported purchase he directly owns 4,334,667 shares, plus 169,369 (by trust) and 384,132 (by spouse) indirectly.

Was the Form 4 filed and signed timely for the POST transaction?

The transaction date is 08/19/2025 and the Form 4 bears a signature by an attorney-in-fact dated 08/21/2025, as reported on the form.

Did the Form 4 report any derivative transactions for POST?

No. Table II for derivative securities shows no reported transactions or holdings in this filing.

Is the reported purchase considered a material change in ownership for POST?

The filing shows a 36,000 share purchase with post-transaction direct holdings of 4,334,667 shares; the form does not state materiality and provides no additional context.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 08/21/2025 - 05:12 PM Learn about SEC filing dates

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

STIRITZ WILLIAM P

(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)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
08/19/2025

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	08/19/2025		P		36,000	A	$109.53	4,334,667	D
Common Stock								169,369	I	By Trust
Common Stock								384,132	I	By Spouse

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

Explanation of Responses:

Remarks:

	/s/ Diedre J. Gray, Attorney-in-Fact	08/21/2025
	** 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.