X0306 4 2012-09-24 1 0000089439 MUELLER INDUSTRIES INC MLI 0001213601 CUMMING IAN M. 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 and Chairman 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/ Ian M. Cumming 2012-09-25