Form 8-K
8-K — MUELLER INDUSTRIES INC
Accession: 0000089439-26-000027
Filed: 2026-07-01
Period: 2026-06-29
CIK: 0000089439
SIC: 3350 (ROLLING DRAWING & EXTRUDING OF NONFERROUS METALS)
Item: Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year
Item: Financial Statements and Exhibits
Documents
8-K — mli-20260629.htm (Primary)
EX-3.1 (ex-3_16292026certificateof.htm)
GRAPHIC (mli-20260629_g1.jpg)
XML — IDEA: XBRL DOCUMENT (R1.htm)
8-K
8-K (Primary)
Filename: mli-20260629.htm · Sequence: 1
mli-20260629
0000089439false12/2600000894392026-06-292026-06-29
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported): June 29, 2026
MUELLER INDUSTRIES INC.
(Exact name of registrant as specified in its charter)
Delaware 1-6770 25-0790410
(State or other jurisdiction (Commission File (IRS Employer
of incorporation) Number) Identification No.)
150 Schilling Boulevard Suite 100
Collierville Tennessee 38017
(Address of principal executive offices) (Zip Code)
Registrant’s telephone number, including area code: (901) 753-3200
Registrant’s Former Name or Address, if changed since last report: N/A
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):
☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities registered pursuant to Section 12(b) of the Act:
Title of each class Trading Symbol Name of exchange on which registered
Common Stock, $0.01 Par Value MLI NYSE
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).
Emerging growth company ☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new of revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐
Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.
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.
Item 9.01 Financial Statements and Exhibits.
(d) Exhibits
3.1
Certificate of Amendment for Mueller Industries, Inc., effective as of June 29, 2026
2
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this Report to be signed on its behalf by the undersigned hereunto duly authorized.
MUELLER INDUSTRIES, INC.
By:
/s/ CHRISTOPHER J. MIRITELLO
Name: Christopher J. Miritello
Title: Executive Vice President - General Counsel & Secretary
Date: July 1, 2026
3
EX-3.1
EX-3.1
Filename: ex-3_16292026certificateof.htm · Sequence: 2
Document
CERTIFICATE OF AMENDMENT
OF
RESTATED CERTIFICATE OF INCORPORATION
OF
MUELLER INDUSTRIES, INC.
Pursuant to Section 242 of the General Corporation Law
The corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware does hereby certify:
FIRST: That the Board of Directors of Mueller Industries, Inc., acting pursuant to Section 141(f) of the General Corporation Law of the State of Delaware, approved an amendment to the Restated Certificate of Incorporation of said corporation. The resolution setting forth the amendment is as follows:
RESOLVED, that the Restated Certificate of Incorporation of this corporation be amended by deleting all of the text in the first paragraph of Article V and replacing it with the following in substitution therefor:
The total number of shares of stock which the Corporation shall have authority to issue is 505,000,000; of such shares the number of common shares which the Corporation shall have authority to issue is 500,000,000, par value $.01 per share (“Common Stock”), and the number of preferred shares which the Corporation shall have authority to issue is 5,000,000, par value $1.00 per share (“Preferred Stock”). Upon the effectiveness of the Certificate of Amendment first inserting this sentence (the “Effective Time”), each share of Common Stock (and each fraction of a share) issued and outstanding, and each share of Common Stock (and each fraction of a share) held as treasury stock, in each case as of immediately prior to the Effective Time, shall automatically, without further action on the part of the Corporation or any holder of thereof, be subdivided and reclassified into two fully paid and nonassessable shares (or twice the number of fully paid and non-assessable fractions of a share, as applicable) of Common Stock, reflecting a 2:1 stock split.
SECOND: That said amendment was duly adopted in accordance with the provisions of Section 242 of the General Corporation Law of the State of Delaware.
THIRD: That this Certificate of Amendment shall be effective at 4:01 p.m. (Eastern Time) on June 29, 2026.
IN WITNESS WHEREOF, said corporation has caused this certificate to be signed this 29th day of June 2026.
MUELLER INDUSTRIES, INC.
By:/s/ CHRISTOPHER J. MIRITELLO
Christopher J. Miritello
EVP – General Counsel & Secretary
GRAPHIC
GRAPHIC
Filename: mli-20260629_g1.jpg · Sequence: 6
Binary file (42839 bytes)
Download mli-20260629_g1.jpg
XML — IDEA: XBRL DOCUMENT
XML
Filename: R1.htm · Sequence: 8
v3.26.1
Cover
Jun. 29, 2026
Cover [Abstract]
Document Type
8-K
Document Period End Date
Jun. 29, 2026
Entity Registrant Name
MUELLER INDUSTRIES INC
Entity Central Index Key
0000089439
Amendment Flag
false
Entity Incorporation, State or Country Code
DE
Entity File Number
1-6770
Entity Tax Identification Number
25-0790410
Entity Address, Address Line One
150 Schilling Boulevard
Entity Address, Address Line Two
Suite 100
Entity Address, City or Town
Collierville
Entity Address, State or Province
TN
Entity Address, Postal Zip Code
38017
City Area Code
(901)
Local Phone Number
753-3200
Written Communications
false
Soliciting Material
false
Pre-commencement Tender Offer
false
Pre-commencement Issuer Tender Offer
false
Title of 12(b) Security
Common Stock, $0.01 Par Value
Trading Symbol
MLI
Security Exchange Name
NYSE
Entity Emerging Growth Company
false
Current Fiscal Year End Date
--12-26
X
- Definition
Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.
+ References
No definition available.
+ Details
Name:
dei_AmendmentFlag
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Area code of city
+ References
No definition available.
+ Details
Name:
dei_CityAreaCode
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Cover page.
+ References
No definition available.
+ Details
Name:
dei_CoverAbstract
Namespace Prefix:
dei_
Data Type:
xbrli:stringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
End date of current fiscal year in the format --MM-DD.
+ References
No definition available.
+ Details
Name:
dei_CurrentFiscalYearEndDate
Namespace Prefix:
dei_
Data Type:
xbrli:gMonthDayItemType
Balance Type:
na
Period Type:
duration
X
- Definition
For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.
+ References
No definition available.
+ Details
Name:
dei_DocumentPeriodEndDate
Namespace Prefix:
dei_
Data Type:
xbrli:dateItemType
Balance Type:
na
Period Type:
duration
X
- Definition
The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.
+ References
No definition available.
+ Details
Name:
dei_DocumentType
Namespace Prefix:
dei_
Data Type:
dei:submissionTypeItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Address Line 1 such as Attn, Building Name, Street Name
+ References
No definition available.
+ Details
Name:
dei_EntityAddressAddressLine1
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Address Line 2 such as Street or Suite number
+ References
No definition available.
+ Details
Name:
dei_EntityAddressAddressLine2
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Name of the City or Town
+ References
No definition available.
+ Details
Name:
dei_EntityAddressCityOrTown
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Code for the postal or zip code
+ References
No definition available.
+ Details
Name:
dei_EntityAddressPostalZipCode
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Name of the state or province.
+ References
No definition available.
+ Details
Name:
dei_EntityAddressStateOrProvince
Namespace Prefix:
dei_
Data Type:
dei:stateOrProvinceItemType
Balance Type:
na
Period Type:
duration
X
- Definition
A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2
+ Details
Name:
dei_EntityCentralIndexKey
Namespace Prefix:
dei_
Data Type:
dei:centralIndexKeyItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Indicate if registrant meets the emerging growth company criteria.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2
+ Details
Name:
dei_EntityEmergingGrowthCompany
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.
+ References
No definition available.
+ Details
Name:
dei_EntityFileNumber
Namespace Prefix:
dei_
Data Type:
dei:fileNumberItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Two-character EDGAR code representing the state or country of incorporation.
+ References
No definition available.
+ Details
Name:
dei_EntityIncorporationStateCountryCode
Namespace Prefix:
dei_
Data Type:
dei:edgarStateCountryItemType
Balance Type:
na
Period Type:
duration
X
- Definition
The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2
+ Details
Name:
dei_EntityRegistrantName
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b-2
+ Details
Name:
dei_EntityTaxIdentificationNumber
Namespace Prefix:
dei_
Data Type:
dei:employerIdItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Local phone number for entity.
+ References
No definition available.
+ Details
Name:
dei_LocalPhoneNumber
Namespace Prefix:
dei_
Data Type:
xbrli:normalizedStringItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 13e
-Subsection 4c
+ Details
Name:
dei_PreCommencementIssuerTenderOffer
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 14d
-Subsection 2b
+ Details
Name:
dei_PreCommencementTenderOffer
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Title of a 12(b) registered security.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection b
+ Details
Name:
dei_Security12bTitle
Namespace Prefix:
dei_
Data Type:
dei:securityTitleItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Name of the Exchange on which a security is registered.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 12
-Subsection d1-1
+ Details
Name:
dei_SecurityExchangeName
Namespace Prefix:
dei_
Data Type:
dei:edgarExchangeCodeItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
-Number 240
-Section 14a
-Subsection 12
+ Details
Name:
dei_SolicitingMaterial
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Trading symbol of an instrument as listed on an exchange.
+ References
No definition available.
+ Details
Name:
dei_TradingSymbol
Namespace Prefix:
dei_
Data Type:
dei:tradingSymbolItemType
Balance Type:
na
Period Type:
duration
X
- Definition
Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Securities Act
-Number 230
-Section 425
+ Details
Name:
dei_WrittenCommunications
Namespace Prefix:
dei_
Data Type:
xbrli:booleanItemType
Balance Type:
na
Period Type:
duration