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Item 5.03
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Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.
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On June 1, 2026, Mueller Industries, Inc. (the "Company") announced a two-for-one forward stock split (the "Stock Split") of the Company's issued common stock, to be effected through the filing of an amendment to the Company's Restated Certificate of Incorporation (the "Amendment") with the Secretary of State of the State of Delaware. On June 29, 2026, the Company filed the Amendment to effect the Stock Split and proportionately increase the number of shares of the Company's authorized common stock from 250,000,000 shares to 500,000,000 shares. The Amendment, which became effective at 4:01 p.m. Eastern Time on June 29, 2026, is filed as Exhibit 3.1 to this Current Report on Form 8-K. Trading is expected to commence on a split-adjusted basis at market open on July 1, 2026.