144 0001549986 XXXXXXXX LIVE 0000089439 Mueller Industries, Inc. 001-06770 150 Schilling Boulevard, Suite 100 Collierville TN 38017 901-753-3200 Steffen Sigloch Officer Common Stock JP Morgan Securities LLC

390 Madison Avenue, 6th Floor New York NY 10017

19585 1556420 110649746 07/01/2025 NYSE Common Stock 08/02/2024 Vested restricted shares Issuer N 19585 08/02/2024 Compensation N Steffen Sigloch

C/o Mueller Industries, Inc. 150 Schilling Boulevard, Suite 100 Collierville TN 38017

Common Stock 04/03/2025 19584 1466103 Steffen Sigloch

C/o Mueller Industries, Inc. 150 Schilling Boulevard, Suite 100 Collierville TN 38017

Common Stock 05/12/2025 19584 1521133 The shares covered by this filing will be sold on 07/01/25 or within three months from the date of this filing. 07/01/2025 10/30/2024 /s/ J.P. Morgan Securities LLC as agent and attorney-in-fact for Steffen Sigloch