X0609 4 2026-08-27 0 0000089439 MUELLER INDUSTRIES INC MLI 0001422094 GOLDMAN SCOTT JAY false 3541 CORDOVA DRIVE CALABASAS CA 91302 1 0 0 0 0 Common Stock 2026-08-27 4 S 0 2000 64.08 D 79734 D This form reflects the sale of shares which may be deemed to be beneficially owned by the Reporting Person. The sale was effected pursuant to a previously disclosed Rule 10b5-1 trading plan. On June 30, 2026, the Issuer effected a 2-for-1 stock split of its common stock in the form of a stock dividend, as a result of which the Reporting Person received an additional 40,867 shares of common stock. Anthony J. Steinriede, Attorney-in-Fact 2026-08-27