X0508 4 2025-11-12 0 0001530950 Post Holdings, Inc. POST 0001882375 CATOGGIO NICOLAS C/O POST HOLDINGS, INC. 2503 S. HANLEY ROAD ST. LOUIS MO 63144 0 1 0 0 PRES & CEO, PCB 0 Common Stock 2025-11-12 4 M 0 3326 0 A 62916 D Common Stock 2025-11-12 4 F 0 1517 106.02 D 61399 D Common Stock 2025-11-12 4 M 0 5281 0 A 66680 D Common Stock 2025-11-12 4 F 0 2409 106.02 D 64271 D Restricted Stock Units 2025-11-12 4 M 0 3326 0 D Common Stock 3326 0 D Restricted Stock Units 2025-11-12 4 M 0 5281 0 D Common Stock 5281 10564 D Surrender of shares in payment of tax withholding due as a result of the vesting of 3,326 restricted stock units ("RSUs") in accordance with Rule 16b-3. Surrender of shares in payment of tax withholding due as a result of the vesting of 5,281 RSUs in accordance with Rule 16b-3. Each RSU represents a contingent right to receive one share of Post Holdings, Inc. common stock. The RSUs were granted under the Post Holdings, Inc. Amended and Restated 2021 Long-Term Incentive Plan in a transaction exempt under Rule 16b-3. The RSUs vested on the first anniversary of the date of grant without any action on the part of the participant. One-third of the RSUs vest on each of the first, second and third anniversaries of the date of grant without any action on the part of the participant, subject to the terms of the applicable award agreement. /s/ Diedre J. Gray, Attorney-in-Fact 2025-11-14