X0609 4 2026-09-01 0 0001530950 Post Holdings, Inc. POST 0001052058 STIRITZ WILLIAM P false C/O POST HOLDINGS, INC. 2503 S. HANLEY ROAD ST. LOUIS MO 63144 0 0 0 1 Chairman Emeritus 0 Common Stock 2026-09-01 4 S 0 99990 83.54 D 284142 I By Spouse Common Stock 2026-09-01 4 S 0 6207 84.63 D 277935 I By Spouse Common Stock 2026-09-02 4 S 0 277707 84.23 D 228 I By Spouse Common Stock 2026-09-02 4 S 0 228 85.01 D 0 I By Spouse Common Stock 4334667 D Common Stock 169369 I By Trust 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. 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. 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. /s/ Diedre J. Gray, Attorney-in-Fact 2026-09-03