Director in Mueller Industries (MLI) granted 1,222 new shares

Rhea-AI Filing Summary

GLADSTEIN GARY S reported acquisition or exercise transactions in this Form 4 filing.

Mueller Industries director Gary S. Gladstein reported a compensation-related grant of 1,222 shares of Common Stock at no cost. This award increased his direct holdings to 32,100 shares. He is also reported as the beneficiary of a trust that holds 290,206 additional Common Stock shares indirectly.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider GLADSTEIN GARY S

Role null

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

Holdings After Transaction: Common Stock — 32,100 shares (Direct, null); Common Stock — 290,206 shares (Indirect, trust where he serves as beneficiary)

Footnotes (1)

Key Figures

Stock grant: 1,222 shares Direct holdings after grant: 32,100 shares Indirect holdings: 290,206 shares

3 metrics

Stock grant 1,222 shares Common Stock grant at $0.00 per share

Direct holdings after grant 32,100 shares Common Stock directly owned by Gary S. Gladstein

Indirect holdings 290,206 shares Common Stock held in a trust where he is beneficiary

Key Terms

Grant, award, or other acquisition, indirect ownership, Common Stock

3 terms

Grant, award, or other acquisition financial

"transaction_code_description: Grant, award, or other acquisition"

indirect ownership financial

"ownership_type: indirect, nature: trust where he serves as beneficiary"

Common Stock financial

"security_title: Common Stock"

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^*

GLADSTEIN GARY S

(Last) (First) (Middle)

400 SE 5TH AVENUE NORTH 706

(Street)

BOCA RATON FLORIDA 33432

(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	32,100	D
Common Stock								290,206	I	trust where he serves as beneficiary

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) disclose?

Mueller Industries disclosed that director Gary S. Gladstein received a grant of 1,222 shares of Common Stock at no cost. This is a compensation-related award, not an open-market purchase or sale, and reflects routine equity-based director compensation.

How many Mueller Industries (MLI) shares did Gary S. Gladstein receive?

Gary S. Gladstein received 1,222 shares of Mueller Industries Common Stock. The filing classifies this as a grant or award acquisition with a per-share price of $0.00, indicating stock-based compensation rather than a cash purchase in the open market.

What are Gary S. Gladstein’s direct holdings of Mueller Industries (MLI) after this filing?

After the reported grant, Gary S. Gladstein directly holds 32,100 shares of Mueller Industries Common Stock. This direct holding figure comes from the total shares reported following the transaction, reflecting his personal ownership position outside of any trusts.

Does Gary S. Gladstein have indirect ownership of Mueller Industries (MLI) shares?

Yes. The Form 4 reports 290,206 Mueller Industries Common Stock shares as indirectly owned through a trust where he serves as beneficiary. This entry is characterized as a holding, not a new transaction, and reflects an existing indirect ownership structure.

Was the Mueller Industries (MLI) Form 4 transaction a buy or a sale?

The Form 4 does not show a traditional buy or sale. Instead, it reports a grant or award acquisition of 1,222 shares at $0.00 per share, which is typical of equity compensation rather than an open-market trade driven by investment decisions.