Amendment No. 3 to Schedule 13D by William P. Stiritz for Post Holdings, Inc.

William P. Stiritz has filed Amendment No. 3 to Schedule 13D regarding his holdings in Post Holdings, Inc. As of October 15, 2025, Stiritz beneficially owns 4,882,968 shares of Common Stock, representing approximately 9.28% of the Issuer's outstanding shares. This includes 4,329,467 shares owned directly, 169,369 shares through The Wildwood Trust, and 384,132 shares through his spouse, Susan Stiritz. The amendment updates the number of shares over which Stiritz has sole and shared voting and disposition power. On August 19, 2025, Stiritz purchased 36,000 shares in the open market for $109.53 per share. The filing also confirms that Susan Stiritz has not been involved in any legal proceedings over the past five years.