144 0001747270 XXXXXXXX LIVE 0000066382 MILLERKNOLL, INC. 001-15141 855 EAST MAIN AVENUE ZEELAND MI 49464-0302 616-654-3000 ANDREA RUTH OWEN Former Affiliate Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

182314 3804587.90 68374732 07/02/2026 NASDAQ Common 08/01/2023 Restricted Stock Vesting Under a Registered Plan Issuer N 23782 08/01/2023 Employee Stock Unit Award(s) Common 08/01/2023 Performance Stock Units Issuer N 15875 08/01/2025 Employee Stock Unit Award(s) Common 07/22/2025 Restricted Stock Vesting Under a Registered Plan Issuer N 76607 07/22/2025 Employee Stock Unit Award(s) Common 10/03/2022 Open Market Purchase Open Market N 66050 10/03/2022 Cash Y 07/02/2026 /s/ Andrea Ruth Owen