Post Holdings: Mainer to be interim accounting chief
The updated standards will apply across Post Holdings and its subsidiaries and affiliates when they take effect February 1, 2027.
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Form Type
8-K
Rhea-AI Filing Summary
Post Holdings, Inc. (POST) said Senior Vice President and Chief Accounting Officer Bradly A. Harper will take a temporary medical leave. During his leave, Executive Vice President, Chief Financial Officer and Treasurer Matthew J. Mainer will serve as Interim Chief Accounting Officer and principal accounting officer.
The company’s updated Code of Conduct will become effective February 1, 2027, replacing the prior code and applying to directors, officers and employees of the company and its subsidiaries and affiliates. The updates add content on artificial intelligence, prediction markets and fraud prevention, and expand or restructure topics including human rights, trade compliance, cybersecurity and data protection, workplace civility, records management, conflicts of interest and internal investigations. Adoption of the new code will not waive any provision of the prior code.
8-K Event Classification
2 items: 5.02, 5.05
2 items
Item 5.02
Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers
Governance
Key personnel changes including departures, elections, or appointments of directors and executive officers.
Item 5.05
Amendments to the Registrant's Code of Ethics, or Waiver of a Provision of the Code of Ethics
Governance
The company amended or granted a waiver from its code of ethics for senior financial officers.
Key Terms
principal accounting officer, prediction markets, trade compliance, internal investigations
4 terms
principal accounting officer regulatory
"Interim Chief Accounting Officer and principal accounting officer"
The Principal Accounting Officer is the person responsible for making sure a company's financial records are accurate and follow the rules. They play a key role in preparing financial reports that show how well the company is doing. This helps investors, managers, and regulators trust the company's financial information.
prediction markets financial
"artificial intelligence, prediction markets and fraud prevention"
Prediction markets are exchanges where people buy and sell contracts that pay out based on the outcome of a future event, effectively turning collective beliefs into a price that reflects the market’s estimated probability. Like a sports betting line or a crowd-sourced weather forecast, they aggregate diverse information and sentiment into a single, continuously updated signal that investors can use to gauge market expectations, inform timing, assess risk, or construct hedges.
trade compliance regulatory
"human rights, trade compliance, cybersecurity and data protection"
Trade compliance is the set of rules, processes and checks a business uses to make sure its buying, selling and movement of goods, services or financial instruments follows laws, embargoes and industry standards. Investors care because failures can lead to fines, blocked deals or damaged reputation that reduce profits and share value; think of it as the company’s road rules and traffic signals that keep operations legal and predictable.
internal investigations regulatory
"conflicts of interest and internal investigations"
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
Who will serve as POST’s interim chief accounting officer?
Matthew J. Mainer, Post Holdings’ Executive Vice President, Chief Financial Officer and Treasurer, will serve as Interim Chief Accounting Officer and principal accounting officer during Bradly A. Harper’s temporary medical leave.
When does POST’s updated Code of Conduct take effect, and who does it cover?
Post Holdings’ updated Code of Conduct will become effective February 1, 2027. It will replace the prior code and apply to all directors, officers and employees of the company and its subsidiaries and affiliates, including the company’s principal executive, financial and accounting officers.
AI-generated analysis. How Rhea-AI works. Not financial advice.
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
______________________
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 OR 15(d) of The
Securities Exchange Act of 1934
Pursuant to Section 13 OR 15(d) of The
Securities Exchange Act of 1934
Date of Report (Date of earliest event reported): October 13, 2026
(Exact name of registrant as specified in its charter)
| (State or other jurisdiction of incorporation) | (Commission File Number) | (IRS Employer Identification No.) | |||||||||
(Address of principal executive offices) (Zip Code)
Registrant’s telephone number, including area code: (314 ) 644-7600
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
Securities registered pursuant to Section 12(b) of the Act:
| Title of each class | Trading Symbol(s) | Name of each exchange on which registered | ||||||
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).
Emerging growth company ☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐
Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.
On October 13, 2026, Post Holdings, Inc. (the “Company”) announced that Bradly A. Harper, the Company’s Senior Vice President, Chief Accounting Officer, will be taking a temporary medical leave of absence. During Mr. Harper’s leave of absence, Matthew J. Mainer, the Company’s Executive Vice President, Chief Financial Officer and Treasurer, will serve as Interim Chief Accounting Officer and principal accounting officer.
Item 5.05. Amendments to the Registrant’s Code of Ethics, or Waiver of a Provision of the Code of Ethics.
On October 15, 2026, the Board of Directors of the Company approved an updated Code of Conduct (the “New Code”), which will become effective February 1, 2027. The New Code will supersede the existing Code of Conduct (the “Prior Code”) and will be applicable to all directors, officers and employees of the Company and its subsidiaries and affiliates, including the Company’s principal executive officer, principal financial officer and principal accounting officer.
The New Code is intended to modernize the content and structure of the Company’s Prior Code for changes in the Company’s business and internal policies and regulatory and technological developments, while maintaining the Company’s core ethical principles and compliance framework. The approval of the New Code does not relate to, and its adoption will not result in, any waiver, explicit or implicit, of any provision in the Prior Code. The substantive updates reflected in the New Code include: (i) new content regarding emerging risk areas and evolving regulatory and technological developments, such as those related to artificial intelligence, prediction markets and fraud prevention; and (ii) expanded or restructured content on the topics of human rights, trade compliance, cybersecurity and data protection, workplace civility, records management, conflicts of interest and internal investigations.
The foregoing description of the updates is subject to and qualified in its entirety by reference to the full text of the New Code. The Prior Code is, and the New Code once effective will be, posted on the Company’s website (www.postholdings.com), under the Governance section within the Sustainability portion of the website.
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SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
Date: October 16, 2026 | Post Holdings, Inc. | |||||||
(Registrant) | ||||||||
By: | /s/ Diedre J. Gray | |||||||
Name: | Diedre J. Gray | |||||||
Title: | Executive Vice President, General Counsel and Chief Administrative Officer, Secretary | |||||||
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