Mueller Industries (MLI) director receives 1,222-share stock award

Rhea-AI Filing Summary

DONOVAN ELIZABETH M reported acquisition or exercise transactions in this Form 4 filing.

Mueller Industries director Elizabeth M. Donovan reported a new stock award. On May 8, 2026, she received a grant of 1,222 shares of Mueller Industries common stock as a compensation-related award at $0.00 per share.

Following this grant, Donovan directly holds 28,085 shares of common stock. The filing also lists an additional 4,000 shares of common stock held indirectly through her spouse, reflecting family ownership rather than an open-market trade.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider DONOVAN ELIZABETH M

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	1,222	$0.00	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 28,085 shares (Direct, null); Common Stock — 4,000 shares (Indirect, by spouse)

Footnotes (1)

Key Figures

Stock award: 1,222 shares Grant price: $0.00 per share Direct holdings after grant: 28,085 shares +1 more

4 metrics

Stock award 1,222 shares Grant, award, or other acquisition on May 8, 2026

Grant price $0.00 per share Reported transaction price for the 1,222-share award

Direct holdings after grant 28,085 shares Total common stock directly owned after May 8, 2026 award

Indirect holdings by spouse 4,000 shares Common stock held indirectly through spouse as of May 8, 2026

Key Terms

Grant, award, or other acquisition, indirect ownership, non-derivative, Common Stock

4 terms

Grant, award, or other acquisition financial

"transaction_code_description: Grant, award, or other acquisition"

indirect ownership financial

"ownership_type: indirect and nature_of_ownership: by spouse"

non-derivative financial

"transaction_type: non-derivative for the 1,222-share award"

Common Stock financial

"security_title: Common Stock for both reported holdings"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

DONOVAN ELIZABETH M

(Last) (First) (Middle)

1947 N. MAUD AVE.

(Street)

CHICAGO ILLINOIS 60614

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
MUELLER INDUSTRIES INC [ MLI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/08/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	05/08/2026		A		1,222	A	$0	28,085	D
Common Stock								4,000	I	by spouse

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

	Anthony J. Steinriede, Attorney-in-Fact	05/11/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Mueller Industries (MLI) report for Elizabeth M. Donovan?

Mueller Industries reported that director Elizabeth M. Donovan received a grant of 1,222 shares of common stock. This was a compensation-related award, not an open-market purchase, and increased her directly held stake in the company.

How many Mueller Industries (MLI) shares does Elizabeth M. Donovan now hold directly?

After the May 8, 2026 grant, Elizabeth M. Donovan directly holds 28,085 shares of Mueller Industries common stock. This figure reflects her post-award ownership as reported in the Form 4 insider filing with the SEC.

What does the 1,222-share grant to the Mueller Industries (MLI) director represent?

The 1,222-share grant represents a stock-based compensation award to director Elizabeth M. Donovan. It was reported at a price of $0.00 per share, indicating a grant or award rather than a market transaction at prevailing trading prices.

Are there indirect Mueller Industries (MLI) holdings reported for Elizabeth M. Donovan?

Yes. The Form 4 shows 4,000 shares of Mueller Industries common stock held indirectly by Elizabeth M. Donovan through her spouse. These shares are classified as indirect ownership, distinguishing them from her 28,085 directly owned shares.

Was the Mueller Industries (MLI) director’s 1,222-share award an open-market purchase?

No. The 1,222 shares reported for Elizabeth M. Donovan were coded as a grant or award acquisition at $0.00 per share, indicating equity compensation rather than an open-market purchase of Mueller Industries common stock.