X0306 4 2012-09-24 1 0000089439 MUELLER INDUSTRIES INC MLI 0000924255 STEINBERG JOSEPH S C/O LEUCADIA NATIONAL CORPORATION 315 PARK AVE SOUTH NEW YORK NY 10010 1 0 0 0 Common Stock 2012-09-24 4 S 0 10422859 41.00 D 0 I See Explanation Common Stock 2012-09-24 4 D 0 1000 0 D 0 D Reflects shares of Mueller Industries, Inc. common stock beneficially owned by Leucadia National Corporation ("Leucadia"). The Reporting Person is a significant shareholder, a director and the President of Leucadia. The Reporting Person disclaims beneficial ownership of the Issuer's common stock owned directly and indirectly by Leucadia, except to the extent of his pecuniary interest, if any. /s/ Joseph S. Steinberg 2012-09-25