Post Holdings chair emeritus sells 384K shares

Chairman Emeritus William P. Stiritz disclosed indirect open-market sales totaling 384,132 POST shares while retaining large direct and trust holdings.

Rhea-AI Filing Summary

Post Holdings, Inc. (POST) insider William P. Stiritz, identified as Chairman Emeritus, reported selling 384,132 shares of common stock on September 1–2, 2026, through indirect holdings "By Spouse". Reported weighted-average sale prices ranged from about $83.26 to $85.01 per share. As of September 1, 2026, he also held 4,334,667 shares directly and 169,369 shares indirectly by trust. No Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Net Seller: 384,132 shares

Net Sell 6 txns

Insider STIRITZ WILLIAM P

Role Insider

Sold 384,132 shs ($32.29M)

Type	Security	Shares	Price	Value
Sale	Common Stock F3	277,707	$84.23	$23.39M
Sale	Common Stock	228	$85.01	$19K
Sale	Common Stock F1	99,990	$83.54	$8.35M
Sale	Common Stock F2	6,207	$84.63	$525K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 0 shares (Indirect, By Spouse); Common Stock — 4,334,667 shares (Direct); Common Stock — 169,369 shares (Indirect, By Trust)

Footnotes (3)

1. F1. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $83.26 to $84.17 per share. The Reporting Person undertakes to provide to Post Holdings, Inc. (the "Issuer"), any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnotes (1), (2) and (3) of this Form 4.
2. F2. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $84.29 to $84.795 per share.
3. F3. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $83.64 to $84.635 per share.

Key Figures

Total shares sold: 384,132 shares September 2, 2026 sale (1): 277,707 shares at $84.23 per share September 2, 2026 sale (2): 228 shares at $85.01 per share +5 more

8 metrics

Total shares sold 384,132 shares Indirect sales of Post common stock on September 1–2, 2026

September 2, 2026 sale (1) 277,707 shares at $84.23 per share Indirect ownership "By Spouse"

September 2, 2026 sale (2) 228 shares at $85.01 per share Indirect ownership "By Spouse"

September 1, 2026 sale (1) 99,990 shares at $83.54 per share Indirect ownership "By Spouse" with weighted-average price range $83.26–$84.17

September 1, 2026 sale (2) 6,207 shares at $84.63 per share Indirect ownership "By Spouse" with weighted-average price range $84.29–$84.795

Direct holdings after transactions 4,334,667 shares Directly held Post common stock as of September 1, 2026

Indirect trust holdings 169,369 shares Indirect ownership "By Trust" as of September 1, 2026

Price range from weighted-average notes $83.26–$84.795 per share Ranges stated in footnotes (1), (2), and (3)

Key Terms

weighted average price, indirect, By Trust, Rule 10b5-1 trading plan

4 terms

weighted average price financial

"The reported price in Column 4 is a weighted average price."

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

indirect financial

"Ownership type for several sales is reported as indirect "By Spouse"."

By Trust financial

"An indirect holding of 169,369 shares is described as "By Trust"."

Rule 10b5-1 trading plan regulatory

"No Rule 10b5-1 trading plan is reported for these transactions."

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

FAQ

What insider transaction did POST report for William P. Stiritz on this Form 4?

The Form 4 reports that Chairman Emeritus William P. Stiritz indirectly sold 384,132 shares of Post Holdings, Inc. common stock on September 1–2, 2026 through holdings attributed "By Spouse" in open-market or private transactions.

Over what dates and at what prices were POST shares sold in this Form 4?

Sales occurred on September 1 and 2, 2026 at weighted-average prices of $83.54, $84.63, $84.23, and $85.01 per share, with related footnotes stating transaction price ranges between $83.26 and $84.795 per share.

How many POST shares did William P. Stiritz sell in each reported transaction?

The reported indirect sales were 99,990 shares at $83.54, 6,207 shares at $84.63, 277,707 shares at $84.23, and 228 shares at $85.01, for a total of 384,132 shares of Post Holdings, Inc. common stock.

What POST shareholdings does William P. Stiritz report after these transactions?

As of September 1, 2026, William P. Stiritz reports direct ownership of 4,334,667 shares of Post common stock and indirect ownership of 169,369 shares held By Trust. The remaining spouse-held balance after the sales is not specified here.

Were the POST insider sales made under a Rule 10b5-1 trading plan?

No. The filing’s Rule 10b5-1 checkbox is marked such that no Rule 10b5-1 trading plan is reported for these transactions, and the footnotes do not state that they were made under a pre-arranged trading plan.

Are the reported POST sales direct or indirect holdings of William P. Stiritz?

All four sale transactions are reported as indirect ownership with the nature of ownership described as "By Spouse". Separate holding entries show direct and trust holdings as of September 1, 2026.

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

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Available on EDGAR 09/03/2026 - 05:37 PM Accepted by SEC EDGAR 09/03/2026 - 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 MISSOURI 63144

(City) (State) (Zip)

UNITED STATES

(Country)

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
	Officer (give title below)	X	Other (specify below)
			Chairman Emeritus

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/01/2026

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

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

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

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	09/01/2026		S		99,990	D	$83.54(1)	284,142	I	By Spouse
Common Stock	09/01/2026		S		6,207	D	$84.63(2)	277,935	I	By Spouse
Common Stock	09/02/2026		S		277,707	D	$84.23(3)	228	I	By Spouse
Common Stock	09/02/2026		S		228	D	$85.01	0	I	By Spouse
Common Stock								4,334,667	D
Common Stock								169,369	I	By Trust

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:

1. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $83.26 to $84.17 per share. The Reporting Person undertakes to provide to Post Holdings, Inc. (the "Issuer"), any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnotes (1), (2) and (3) of this Form 4.

2. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $84.29 to $84.795 per share.

3. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $83.64 to $84.635 per share.

Remarks:

	/s/ Diedre J. Gray, Attorney-in-Fact	09/03/2026
	** 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.
* Form 4: SEC 1474 (03-26)