Post Holdings: interim chief accounting officer; code of conduct updated

What happened

• Post Holdings announced on Oct 13, 2026 that Bradly A. Harper, the company’s Senior Vice President, Chief Accounting Officer, will be taking a temporary medical leave of absence. During his leave, 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.
• On Oct 15, 2026 the board of directors approved an updated Code of Conduct (the New Code), which will become effective Feb 1, 2027 and will supersede the existing Code of Conduct (the Prior Code).

Key details

• Bradly A. Harper’s leave was announced on Oct 13, 2026; Matthew J. Mainer will serve as interim principal accounting officer during the leave.
• The New Code approved on Oct 15, 2026 will be effective Feb 1, 2027 and will apply to all directors, officers and employees of the company and its subsidiaries and affiliates, including the principal executive officer, principal financial officer and principal accounting officer.
• The filing says the New Code updates include new content on emerging risk areas and evolving regulatory and technological developments (including artificial intelligence and prediction markets) and expanded or restructured content on human rights, trade compliance, cybersecurity and data protection, workplace civility, records management, conflicts of interest and internal investigations.

Why it may matter

• Item 5.02 was reported: departure of directors or certain officers (temporary medical leave and interim appointment).
• Item 5.05 was reported: amendment to registrant’s code of ethics (approval of an updated code of conduct, effective Feb 1, 2027).
• The filing does not show why the insider traded or why the company acted.