X0306 4 2013-02-01 0 0000089439 MUELLER INDUSTRIES INC MLI 0001341985 Christopher Gregory L. 8285 TOURNAMENT DRIVE, SUITE 150 MEMPHIS TN 38125 1 1 0 0 Chief Executive Officer Common Stock 2013-02-01 4 S 0 20000 54.02 D 99250 D Common Stock 113400 I See footnote. Represents a weighted average sales price. The sales price ranged from $53.59 to $54.30. Upon request, the full sale information regarding the number of shares sold at each price increment will be provided to the Commission, the issuer, or a security holder of the issuer. This form reflects the sale of shares which may be deemed to be beneficially owned by the Reporting Person on 2/1/13. The sale was effected pursuant to a previously disclosed Rule 10b5-1 trading plan adopted by the Reporting Person on 11/29/12. Represents 3,400 shares owned by Mr. Christopher's children; 70,000 owned by a trust where his wife serves as beneficiary; and 40,000 owned by a trust where he serves as beneficiary. Anthony Steinriede, Attorney-in-Fact 2013-02-01